diff --git a/spring/springmvc-base-annotation/README.md b/spring/springmvc-base-annotation/README.md
index aec812f..080da07 100644
--- a/spring/springmvc-base-annotation/README.md
+++ b/spring/springmvc-base-annotation/README.md
@@ -1,7 +1,6 @@
-# springmvc基础（基于注解）
-
-
-
## 目录
+# springmvc基础（基于注解）
+
+## 目录
一、搭建hello spring工程
1.1 项目搭建
1.2 相关注解说明
@@ -17,937 +16,937 @@
七、Restful风格的请求
## 正文
+## 一、搭建hello spring工程
-## 一、搭建hello spring工程
-
-### 1.1 项目搭建
-
-1.新建maven web工程，并引入相应的依赖
-
-```xml
-
- 5.1.3.RELEASE
-
-
-
-
- org.springframework
- spring-context
- ${spring-base-version}
-
-
- org.springframework
- spring-beans
- ${spring-base-version}
-
-
- org.springframework
- spring-core
- ${spring-base-version}
-
-
- org.springframework
- spring-web
- ${spring-base-version}
-
-
- org.springframework
- spring-webmvc
- ${spring-base-version}
-
-
- javax.servlet
- javax.servlet-api
- 4.0.1
- provided
-
-
-```
-
-2.得益于servlet3.0和spring的支持，我们可以在没有web.xml的情况下完成关于servlet配置。
-
- 新建DispatcherServletInitializer.java文件,这个类的作用相当于我们在xml方式下web.xml中配置的DispatcherServlet
-
-```java
-package com.heibaiying.config;
-
-import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
-
-/**
- * @author : heibaiying
- */
-
-public class DispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
-
- protected Class[] getRootConfigClasses() {
- return new Class[0];
- }
-
- protected Class[] getServletConfigClasses() {
- return new Class[]{ServletConfig.class};
- }
-
- protected String[] getServletMappings() {
- return new String[]{"/"};
- }
-}
-
-```
-
-3.新建ServletConfig.java，文件内容如下(这个类相当于我们在xml配置方式中的springApplication.xml)
-
-```java
-package com.heibaiying.config;
-
-import com.heibaiying.exception.NoAuthExceptionResolver;
-import com.heibaiying.interceptors.MyFirstInterceptor;
-import com.heibaiying.interceptors.MySecondInterceptor;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.ComponentScan;
-import org.springframework.context.annotation.Configuration;
-import org.springframework.web.servlet.HandlerExceptionResolver;
-import org.springframework.web.servlet.ViewResolver;
-import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
-import org.springframework.web.servlet.config.annotation.EnableWebMvc;
-import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
-import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
-import org.springframework.web.servlet.view.InternalResourceViewResolver;
-
-import java.util.List;
-
-/**
- * @author : heibaiying
- */
-@Configuration
-@EnableWebMvc
-@ComponentScan(basePackages = {"com.heibaiying.controller"})
-public class ServletConfig implements WebMvcConfigurer {
-
- /**
- * 配置视图解析器
- */
- @Bean
- public ViewResolver viewResolver() {
- InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver();
- internalResourceViewResolver.setPrefix("/WEB-INF/jsp/");
- internalResourceViewResolver.setSuffix(".jsp");
- internalResourceViewResolver.setExposeContextBeansAsAttributes(true);
- return internalResourceViewResolver;
- }
-
- /**
- * 配置静态资源处理器
- */
- public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
- configurer.enable();
- }
-
-}
-
-```
-
-4.在src 下新建controller用于测试
-
-```java
-package com.heibaiying.controller;
-
-import com.heibaiying.exception.NoAuthException;
-import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.RequestMapping;
-
-/**
- * @author : heibaiying
- * @description : hello spring
- */
-
-@Controller
-@RequestMapping("mvc")
-public class HelloController {
-
- @RequestMapping("hello")
- private String hello() {
- return "hello";
- }
-
-}
-
-```
-
-5.在WEB-INF 下新建jsp文件夹，新建hello.jsp 文件
-
-```jsp
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-
-
- Title
-
-
- Hello Spring MVC!
-
-
-```
-
-6.启动tomcat服务，访问localhost:8080/mvc/hello
-
-### 1.2 相关注解说明
-
-**1.@Configuration**
-
-@Configuration用于定义配置类，可替换xml配置文件，被注解的类内部包含有一个或多个被@Bean注解的方法，这些方法将会被AnnotationConfigApplicationContext或AnnotationConfigWebApplicationContext类进行扫描，并用于构建bean定义，初始化Spring容器。
-
-**2.@EnableWebMvc**
-
-简单的说就是提供了部分springmvc的功能，例如格式转换和参数绑定。
-
-
-
-## 二、配置自定义拦截器
-
-1.创建自定义拦截器，实现接口HandlerInterceptor（这里我们创建两个拦截器，用于测试拦截器方法的执行顺序）
-
-```java
-package com.heibaiying.interceptors;
-
-import org.springframework.web.servlet.HandlerInterceptor;
-import org.springframework.web.servlet.ModelAndView;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
-/**
- * @author : heibaiying
- * @description : spring5 中 preHandle，postHandle，afterCompletion 在接口中被声明为默认方法
- */
-public class MyFirstInterceptor implements HandlerInterceptor {
-
- public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
- System.out.println("进入第一个拦截器preHandle");
- return true;
- }
-
- // 需要注意的是，如果对应的程序报错，不一定会进入这个方法 但一定会进入afterCompletion这个方法
- public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
- System.out.println("进入第一个拦截器postHandle");
- }
-
- public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
- System.out.println("进入第一个拦截器afterCompletion");
- }
-}
-```
-
-```java
-package com.heibaiying.interceptors;
-
-import org.springframework.web.servlet.HandlerInterceptor;
-import org.springframework.web.servlet.ModelAndView;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
-/**
- * @author : heibaiying
- * @description : spring5 中 preHandle，postHandle，afterCompletion 在接口中被声明为默认方法
- */
-public class MySecondInterceptor implements HandlerInterceptor {
-
- public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
- System.out.println("进入第二个拦截器preHandle");
- return true;
- }
-
- public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
- System.out.println("进入第二个拦截器postHandle");
- }
-
- public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
- System.out.println("进入第二个拦截器afterCompletion");
- }
-}
-
-```
-
-2.在ServletConfig.java中注册自定义拦截器
-
-```java
- /**
- * 添加自定义拦截器
- */
- public void addInterceptors(InterceptorRegistry registry) {
- registry.addInterceptor(new MyFirstInterceptor()).addPathPatterns("/mvc/**").excludePathPatterns("mvc/login");
- registry.addInterceptor(new MySecondInterceptor()).addPathPatterns("/mvc/**");
- }
-```
-
-3.关于多个拦截器方法执行顺序的说明
-
-拦截器的执行顺序是按声明的先后顺序执行的，先声明的拦截器中的preHandle方法会先执行，然而它的postHandle方法和afterCompletion方法却会后执行。
-
-
-
-## 三、全局异常处理
-
-1.定义自定义异常
-
-```java
-package com.heibaiying.exception;
-
-/**
- * @author : heibaiying
- * @description : 自定义无权限异常
- */
-public class NoAuthException extends RuntimeException {
-
- public NoAuthException() {
- super();
- }
-
- public NoAuthException(String message) {
- super(message);
- }
-
- public NoAuthException(String message, Throwable cause) {
- super(message, cause);
- }
-
- public NoAuthException(Throwable cause) {
- super(cause);
- }
-
-}
-
-```
-
-2.实现自定义异常处理器
-
-```java
-package com.heibaiying.exception;
-
-import org.springframework.web.servlet.HandlerExceptionResolver;
-import org.springframework.web.servlet.ModelAndView;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
-/**
- * @author : heibaiying
- * @description : 无权限异常处理机制
- */
-public class NoAuthExceptionResolver implements HandlerExceptionResolver {
-
- public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
- if (ex instanceof NoAuthException && !isAjax(request)) {
- return new ModelAndView("NoAuthPage");
- }
- return new ModelAndView();
- }
-
- // 判断是否是Ajax请求
- private boolean isAjax(HttpServletRequest request) {
- return "XMLHttpRequest".equalsIgnoreCase(request.getHeader("X-Requested-With"));
- }
-}
-
-```
-
-3.在ServletConfig.java注册自定义异常处理器
-
-```java
-/**
-* 添加全局异常处理器
-*/
-public void configureHandlerExceptionResolvers(List resolvers) {
- resolvers.add(new NoAuthExceptionResolver());
-}
-```
-
-4.定义测试controller，抛出自定义异常
-
-```java
-@Controller
-@RequestMapping("mvc")
-public class HelloController {
-
- @RequestMapping("hello")
- private String hello() {
- return "hello";
- }
-
-
- @RequestMapping("auth")
- private void auth() {
- throw new NoAuthException("没有对应的访问权限！");
- }
-}
-```
-
-注：调用这个controller时，同时也可以验证在拦截器部分提到的：如果对应的程序报错，拦截器不一定会进入postHandle这个方法 但一定会进入afterCompletion这个方法
-
-
-
-## 四、参数绑定
-
-### 4.1 参数绑定
-
-1.新建Programmer.java
-
-```java
-package com.heibaiying.bean;
-
-import lombok.Data;
-
-/**
- * @author : heibaiying
- * @description :
- */
-@Data
-public class Programmer {
-
- private String name;
-
- private int age;
-
- private float salary;
-
- private String birthday;
-}
-
-```
-
-注：@Data 是lombok包下的注解，用来生成相应的set、get方法，使得类的书写更为简洁。
-
-2.新建ParamBindController.java 文件
-
-```java
-package com.heibaiying.controller;
-
-import com.heibaiying.bean.Programmer;
-import org.springframework.format.annotation.DateTimeFormat;
-import org.springframework.format.datetime.DateFormatter;
-import org.springframework.stereotype.Controller;
-import org.springframework.ui.Model;
-import org.springframework.web.bind.WebDataBinder;
-import org.springframework.web.bind.annotation.InitBinder;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
-
-import java.util.Date;
-
-/**
- * @author : heibaiying
- * @description :参数绑定
- */
-@Controller
-public class ParamBindController {
-
- @InitBinder
- protected void initBinder(WebDataBinder binder) {
- binder.addCustomFormatter(new DateFormatter("yyyy-MM-dd HH:mm:ss"));
- }
-
-
- // 参数绑定与日期格式转换
- @RequestMapping("param")
- public String param(String name, int age, double salary, @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date birthday, Model model) {
- model.addAttribute("name", name);
- model.addAttribute("age", age);
- model.addAttribute("salary", salary);
- model.addAttribute("birthday", birthday);
- return "param";
- }
-
- @RequestMapping("param2")
- public String param2(String name, int age, double salary, Date birthday, Model model) {
- model.addAttribute("name", name);
- model.addAttribute("age", age);
- model.addAttribute("salary", salary);
- model.addAttribute("birthday", birthday);
- return "param";
- }
-
-
- @PostMapping("param3")
- public String param3(Programmer programmer, String extendParam, Model model) {
- System.out.println("extendParam" + extendParam);
- model.addAttribute("p", programmer);
- return "param";
- }
-
-}
-
-```
-
-3.新建param.jsp 文件
-
-```jsp
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-
-
- Restful
-
-
-
- - 姓名：${empty name ? p.name : name}
- - 年龄：${empty age ? p.age : age}
- - 薪酬：${empty salary ? p.salary : salary}
- - 生日：${empty birthday ? p.birthday : birthday}
-
-
-
-
-```
-
-4.启动tomcat，用[postman](https://www.getpostman.com/)软件发送请求进行测试
-
-### 4.2 关于日期格式转换的三种方法
-
-1.如上实例代码所示，在对应的controller中初始化绑定
-
-```java
-@InitBinder
- protected void initBinder(WebDataBinder binder) {
- binder.addCustomFormatter(new DateFormatter("yyyy-MM-dd HH:mm:ss"));
- }
-```
-
-2.利用@DateTimeFormat注解，如果是用实体类去接收参数，则在对应的属性上声明
-
-```java
-public String param(@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date birthday)
-```
-
-3.使用全局的日期格式绑定，新建自定义日期格式转化类，之后在ServletConfig.java中进行注册
-
-```java
-package com.heibaiying.convert;
-
-import org.springframework.core.convert.converter.Converter;
-
-import java.text.SimpleDateFormat;
-import java.util.Date;
-
-/**
- * @author : heibaiying
- * @description :
- */
-public class CustomDateConverter implements Converter {
-
- public Date convert(String s) {
- try {
- SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
- return simpleDateFormat.parse(s);
- } catch (Exception e) {
- e.printStackTrace();
- }
- return null;
- }
-}
-
-```
-
-ServletConfig.java
-
-```java
-/**
- * 添加全局日期处理
- */
-public void addFormatters(FormatterRegistry registry) {
- registry.addConverter(new CustomDateConverter());
-}
-```
-
-
-
-## 五、数据校验
-
-1.spring支持的数据校验是JSR303的标准，需要引入依赖的jar包
-
-```java
-
-
- org.hibernate.validator
- hibernate-validator
- 6.0.13.Final
-
-
- javax.validation
- validation-api
- 2.0.1.Final
-
-```
-
-2.新建测试ParamValidController.java，主要是在需要校验的参数前加上@Validated，声明参数需要被校验，同时加上bindingResult参数，这个参数中包含了校验的结果
-
-```java
-package com.heibaiying.controller;
-
-import com.heibaiying.bean.Programmer;
-import org.hibernate.validator.constraints.Length;
-import org.springframework.format.annotation.DateTimeFormat;
-import org.springframework.format.datetime.DateFormatter;
-import org.springframework.stereotype.Controller;
-import org.springframework.ui.Model;
-import org.springframework.validation.BindingResult;
-import org.springframework.validation.ObjectError;
-import org.springframework.validation.annotation.Validated;
-import org.springframework.web.bind.WebDataBinder;
-import org.springframework.web.bind.annotation.InitBinder;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-import javax.validation.constraints.Min;
-import javax.validation.constraints.NotNull;
-import java.util.Date;
-import java.util.List;
-
-/**
- * @author : heibaiying
- * @description :数据校验
- */
-@RestController
-public class ParamValidController {
-
-
- @PostMapping("validate")
- public void valid(@Validated Programmer programmer,
- BindingResult bindingResult) {
- List allErrors = bindingResult.getAllErrors();
- for (ObjectError error : allErrors) {
- System.out.println(error.getDefaultMessage());
- }
- }
-
-}
-
-```
-
-3.在Programmer.java的对应属性上加上注解约束(支持的注解可以在javax.validation.constraints包中查看)
-
-```java
-package com.heibaiying.bean;
-
-import lombok.Data;
-
-import javax.validation.constraints.Min;
-import javax.validation.constraints.NotNull;
-
-/**
- * @author : heibaiying
- * @description :
- */
-@Data
-public class Programmer {
-
- @NotNull
- private String name;
-
- @Min(value = 0,message = "年龄不能为负数！" )
- private int age;
-
- @Min(value = 0,message = "薪酬不能为负数！" )
- private float salary;
-
- private String birthday;
-}
-
-```
-
-## 六、文件上传与下载
-
-#### 6.1 文件上传
-
-1.在ServletConfig.java中进行配置，使之支持文件上传
-
-```java
-/**
-* 配置文件上传
-*/
-@Bean
-public CommonsMultipartResolver multipartResolver(){
- CommonsMultipartResolver resolver = new CommonsMultipartResolver();
- resolver.setMaxUploadSize(1024*1000*10);
- resolver.setMaxUploadSizePerFile(1024*1000);
- resolver.setDefaultEncoding("utf-8");
- return resolver;
-}
-```
-
-2.新建测试上传的FileController.java
-
-```java
-package com.heibaiying.controller;
-
-import com.heibaiying.utils.FileUtil;
-import org.apache.commons.io.FileUtils;
-import org.springframework.http.HttpHeaders;
-import org.springframework.http.HttpStatus;
-import org.springframework.http.MediaType;
-import org.springframework.http.ResponseEntity;
-import org.springframework.stereotype.Controller;
-import org.springframework.ui.Model;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestParam;
-import org.springframework.web.multipart.MultipartFile;
-
-import javax.servlet.http.HttpSession;
-import java.io.File;
-import java.io.IOException;
-import java.io.UnsupportedEncodingException;
-import java.net.URLEncoder;
-
-/**
- * @author : heibaiying
- * @description : 文件上传
- */
-
-@Controller
-public class FileController {
-
- @GetMapping("file")
- public String filePage() {
- return "file";
- }
-
-
- /***
- * 单文件上传
- */
- @PostMapping("upFile")
- public String upFile(MultipartFile file, HttpSession session) {
- //保存在项目根目录下image文件夹下，如果文件夹不存在则创建
- FileUtil.saveFile(file, session.getServletContext().getRealPath("/image"));
- // success.jsp 就是一个简单的成功页面
- return "success";
- }
-
- /***
- * 多文件上传 多个文件用同一个名字
- */
- @PostMapping("upFiles")
- public String upFiles(@RequestParam(name = "file") MultipartFile[] files, HttpSession session) {
- for (MultipartFile file : files) {
- FileUtil.saveFile(file, session.getServletContext().getRealPath("images"));
- }
- return "success";
- }
-
- /***
- * 多文件上传方式2 分别为不同文件指定不同名字
- */
- @PostMapping("upFiles2")
- public String upFile(String extendParam,
- @RequestParam(name = "file1") MultipartFile file1,
- @RequestParam(name = "file2") MultipartFile file2, HttpSession session) {
- String realPath = session.getServletContext().getRealPath("images2");
- FileUtil.saveFile(file1, realPath);
- FileUtil.saveFile(file2, realPath);
- System.out.println("extendParam:" + extendParam);
- return "success";
- }
-}
-
-```
-
-3.其中工具类FileUtil.java代码如下
-
-```java
-package com.heibaiying.utils;
-
-import org.springframework.web.multipart.MultipartFile;
-import java.io.*;
-
-/**
- * @author : heibaiying
- * @description : 文件上传工具类
- */
-
-public class FileUtil {
-
- public static String saveFile(MultipartFile file, String path) {
- InputStream inputStream = null;
- FileOutputStream outputStream = null;
- String fullPath = path + File.separator + file.getOriginalFilename();
- try {
- File saveDir = new File(path);
- if (!saveDir.exists()) {
- saveDir.mkdirs();
- }
- outputStream = new FileOutputStream(new File(fullPath));
- inputStream = file.getInputStream();
- byte[] bytes = new byte[1024 * 1024];
- int read;
- while ((read = inputStream.read(bytes)) != -1) {
- outputStream.write(bytes, 0, read);
- }
- } catch (IOException e) {
- e.printStackTrace();
- } finally {
- if (inputStream != null) {
- try {
- inputStream.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- if (outputStream != null) {
- try {
- outputStream.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- return fullPath;
- }
-
-}
-```
-
-4.新建用于上传的jsp页面，上传文件时表单必须声明 enctype="multipart/form-data"
-
-```jsp
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-
-
- 文件上传
-
-
-
-
-
-
-
-
-
-
-
-
-
-```
-
-#### 6.2 文件下载
-
-1.在fileController.java中加上方法：
-
-```java
- /***
- * 上传用于下载的文件
- */
- @PostMapping("upFileForDownload")
- public String upFileForDownload(MultipartFile file, HttpSession session, Model model) throws UnsupportedEncodingException {
- String path = FileUtil.saveFile(file, session.getServletContext().getRealPath("/image"));
- model.addAttribute("filePath", URLEncoder.encode(path,"utf-8"));
- model.addAttribute("fileName", file.getOriginalFilename());
- return "fileDownload";
- }
-
- /***
- * 下载文件
- */
- @GetMapping("download")
- public ResponseEntity downloadFile(String filePath) throws IOException {
- HttpHeaders headers = new HttpHeaders();
- File file = new File(filePath);
- // 解决文件名中文乱码
- String fileName=new String(file.getName().getBytes("UTF-8"),"iso-8859-1");
- headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
- headers.setContentDispositionFormData("attachment", fileName);
-
- return new ResponseEntity(FileUtils.readFileToByteArray(file),
- headers, HttpStatus.CREATED);
- }
-```
-
-2.其中fileDownload.jsp 如下：
-
-```jsp
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-
-
- 文件下载
-
-
- ${fileName}
-
-
-```
-
-
-
-## 七、Restful风格的请求
-
-1.新建Pet.java实体类
-
-```java
-package com.heibaiying.bean;
-
-import lombok.Data;
-
-/**
- * @author : heibaiying
- * @description :测试restful风格的实体类
- */
-
-@Data
-public class Pet {
-
- private String ownerId;
-
- private String petId;
-}
-
-```
-
-2.新建RestfulController.java，用@PathVariable和@ModelAttribute注解进行参数绑定。
-
-注： 在REST中，资源通过URL进行识别和定位。REST中的行为是通过HTTP方法定义的。在进行不同行为时对应HTTP方法和Spring注解分别如下：
-
-- 创建资源时：POST（PostMapping）
-- 读取资源时：GET（ @GetMapping）
-- 更新资源时：PUT或PATCH（PutMapping、PatchMapping）
-- 删除资源时：DELETE（DeleteMapping）
-
-```java
-package com.heibaiying.controller;
-
-import com.heibaiying.bean.Pet;
-import org.springframework.validation.annotation.Validated;
-import org.springframework.web.bind.annotation.*;
-
-/**
- * @author : heibaiying
- * @description : Restful 风格的请求
- */
-
-@RestController
-public class RestfulController {
-
- @GetMapping("restful/owners/{ownerId}/pets/{petId}")
- public void get(@PathVariable String ownerId, @PathVariable String petId) {
- System.out.println("ownerId:" + ownerId);
- System.out.println("petId:" + petId);
- }
-
- @GetMapping("restful2/owners/{ownerId}/pets/{petId}")
- public void get(@ModelAttribute Pet pet) {
- System.out.println("ownerId:" + pet.getOwnerId());
- System.out.println("petId:" + pet.getPetId());
- }
-
-}
-
-```
-
+### 1.1 项目搭建
+
+1.新建maven web工程，并引入相应的依赖
+
+```xml
+
+ 5.1.3.RELEASE
+
+
+
+
+ org.springframework
+ spring-context
+ ${spring-base-version}
+
+
+ org.springframework
+ spring-beans
+ ${spring-base-version}
+
+
+ org.springframework
+ spring-core
+ ${spring-base-version}
+
+
+ org.springframework
+ spring-web
+ ${spring-base-version}
+
+
+ org.springframework
+ spring-webmvc
+ ${spring-base-version}
+
+
+ javax.servlet
+ javax.servlet-api
+ 4.0.1
+ provided
+
+
+```
+
+2.得益于servlet3.0和spring的支持，我们可以在没有web.xml的情况下完成关于servlet配置。
+
+ 新建DispatcherServletInitializer.java文件,这个类的作用相当于我们在xml方式下web.xml中配置的DispatcherServlet
+
+```java
+package com.heibaiying.config;
+
+import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
+
+/**
+ * @author : heibaiying
+ */
+
+public class DispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
+
+ protected Class[] getRootConfigClasses() {
+ return new Class[0];
+ }
+
+ protected Class[] getServletConfigClasses() {
+ return new Class[]{ServletConfig.class};
+ }
+
+ protected String[] getServletMappings() {
+ return new String[]{"/"};
+ }
+}
+
+```
+
+3.新建ServletConfig.java，文件内容如下(这个类相当于我们在xml配置方式中的springApplication.xml)
+
+```java
+package com.heibaiying.config;
+
+import com.heibaiying.exception.NoAuthExceptionResolver;
+import com.heibaiying.interceptors.MyFirstInterceptor;
+import com.heibaiying.interceptors.MySecondInterceptor;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.HandlerExceptionResolver;
+import org.springframework.web.servlet.ViewResolver;
+import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+import org.springframework.web.servlet.view.InternalResourceViewResolver;
+
+import java.util.List;
+
+/**
+ * @author : heibaiying
+ */
+@Configuration
+@EnableWebMvc
+@ComponentScan(basePackages = {"com.heibaiying.controller"})
+public class ServletConfig implements WebMvcConfigurer {
+
+ /**
+ * 配置视图解析器
+ */
+ @Bean
+ public ViewResolver viewResolver() {
+ InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver();
+ internalResourceViewResolver.setPrefix("/WEB-INF/jsp/");
+ internalResourceViewResolver.setSuffix(".jsp");
+ internalResourceViewResolver.setExposeContextBeansAsAttributes(true);
+ return internalResourceViewResolver;
+ }
+
+ /**
+ * 配置静态资源处理器
+ */
+ public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
+ configurer.enable();
+ }
+
+}
+
+```
+
+4.在src 下新建controller用于测试
+
+```java
+package com.heibaiying.controller;
+
+import com.heibaiying.exception.NoAuthException;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+/**
+ * @author : heibaiying
+ * @description : hello spring
+ */
+
+@Controller
+@RequestMapping("mvc")
+public class HelloController {
+
+ @RequestMapping("hello")
+ private String hello() {
+ return "hello";
+ }
+
+}
+
+```
+
+5.在WEB-INF 下新建jsp文件夹，新建hello.jsp 文件
+
+```jsp
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ Title
+
+
+ Hello Spring MVC!
+
+
+```
+
+6.启动tomcat服务，访问localhost:8080/mvc/hello
+
+### 1.2 相关注解说明
+
+**1.@Configuration**
+
+@Configuration用于定义配置类，可替换xml配置文件，被注解的类内部包含有一个或多个被@Bean注解的方法，这些方法将会被AnnotationConfigApplicationContext或AnnotationConfigWebApplicationContext类进行扫描，并用于构建bean定义，初始化Spring容器。
+
+**2.@EnableWebMvc**
+
+简单的说就是提供了部分springmvc的功能，例如格式转换和参数绑定。
+
+
+
+## 二、配置自定义拦截器
+
+1.创建自定义拦截器，实现接口HandlerInterceptor（这里我们创建两个拦截器，用于测试拦截器方法的执行顺序）
+
+```java
+package com.heibaiying.interceptors;
+
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @author : heibaiying
+ * @description : spring5 中 preHandle，postHandle，afterCompletion 在接口中被声明为默认方法
+ */
+public class MyFirstInterceptor implements HandlerInterceptor {
+
+ public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
+ System.out.println("进入第一个拦截器preHandle");
+ return true;
+ }
+
+ // 需要注意的是，如果对应的程序报错，不一定会进入这个方法 但一定会进入afterCompletion这个方法
+ public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
+ System.out.println("进入第一个拦截器postHandle");
+ }
+
+ public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
+ System.out.println("进入第一个拦截器afterCompletion");
+ }
+}
+```
+
+```java
+package com.heibaiying.interceptors;
+
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @author : heibaiying
+ * @description : spring5 中 preHandle，postHandle，afterCompletion 在接口中被声明为默认方法
+ */
+public class MySecondInterceptor implements HandlerInterceptor {
+
+ public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
+ System.out.println("进入第二个拦截器preHandle");
+ return true;
+ }
+
+ public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
+ System.out.println("进入第二个拦截器postHandle");
+ }
+
+ public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
+ System.out.println("进入第二个拦截器afterCompletion");
+ }
+}
+
+```
+
+2.在ServletConfig.java中注册自定义拦截器
+
+```java
+ /**
+ * 添加自定义拦截器
+ */
+ public void addInterceptors(InterceptorRegistry registry) {
+ registry.addInterceptor(new MyFirstInterceptor()).addPathPatterns("/mvc/**").excludePathPatterns("mvc/login");
+ registry.addInterceptor(new MySecondInterceptor()).addPathPatterns("/mvc/**");
+ }
+```
+
+3.关于多个拦截器方法执行顺序的说明
+
+拦截器的执行顺序是按声明的先后顺序执行的，先声明的拦截器中的preHandle方法会先执行，然而它的postHandle方法和afterCompletion方法却会后执行。
+
+
+
+## 三、全局异常处理
+
+1.定义自定义异常
+
+```java
+package com.heibaiying.exception;
+
+/**
+ * @author : heibaiying
+ * @description : 自定义无权限异常
+ */
+public class NoAuthException extends RuntimeException {
+
+ public NoAuthException() {
+ super();
+ }
+
+ public NoAuthException(String message) {
+ super(message);
+ }
+
+ public NoAuthException(String message, Throwable cause) {
+ super(message, cause);
+ }
+
+ public NoAuthException(Throwable cause) {
+ super(cause);
+ }
+
+}
+
+```
+
+2.实现自定义异常处理器
+
+```java
+package com.heibaiying.exception;
+
+import org.springframework.web.servlet.HandlerExceptionResolver;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @author : heibaiying
+ * @description : 无权限异常处理机制
+ */
+public class NoAuthExceptionResolver implements HandlerExceptionResolver {
+
+ public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
+ if (ex instanceof NoAuthException && !isAjax(request)) {
+ return new ModelAndView("NoAuthPage");
+ }
+ return new ModelAndView();
+ }
+
+ // 判断是否是Ajax请求
+ private boolean isAjax(HttpServletRequest request) {
+ return "XMLHttpRequest".equalsIgnoreCase(request.getHeader("X-Requested-With"));
+ }
+}
+
+```
+
+3.在ServletConfig.java注册自定义异常处理器
+
+```java
+/**
+* 添加全局异常处理器
+*/
+public void configureHandlerExceptionResolvers(List resolvers) {
+ resolvers.add(new NoAuthExceptionResolver());
+}
+```
+
+4.定义测试controller，抛出自定义异常
+
+```java
+@Controller
+@RequestMapping("mvc")
+public class HelloController {
+
+ @RequestMapping("hello")
+ private String hello() {
+ return "hello";
+ }
+
+
+ @RequestMapping("auth")
+ private void auth() {
+ throw new NoAuthException("没有对应的访问权限！");
+ }
+}
+```
+
+注：调用这个controller时，同时也可以验证在拦截器部分提到的：如果对应的程序报错，拦截器不一定会进入postHandle这个方法 但一定会进入afterCompletion这个方法
+
+
+
+## 四、参数绑定
+
+### 4.1 参数绑定
+
+1.新建Programmer.java
+
+```java
+package com.heibaiying.bean;
+
+import lombok.Data;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+@Data
+public class Programmer {
+
+ private String name;
+
+ private int age;
+
+ private float salary;
+
+ private String birthday;
+}
+
+```
+
+注：@Data 是lombok包下的注解，用来生成相应的set、get方法，使得类的书写更为简洁。
+
+2.新建ParamBindController.java 文件
+
+```java
+package com.heibaiying.controller;
+
+import com.heibaiying.bean.Programmer;
+import org.springframework.format.annotation.DateTimeFormat;
+import org.springframework.format.datetime.DateFormatter;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.WebDataBinder;
+import org.springframework.web.bind.annotation.InitBinder;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+import java.util.Date;
+
+/**
+ * @author : heibaiying
+ * @description :参数绑定
+ */
+@Controller
+public class ParamBindController {
+
+ @InitBinder
+ protected void initBinder(WebDataBinder binder) {
+ binder.addCustomFormatter(new DateFormatter("yyyy-MM-dd HH:mm:ss"));
+ }
+
+
+ // 参数绑定与日期格式转换
+ @RequestMapping("param")
+ public String param(String name, int age, double salary, @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date birthday, Model model) {
+ model.addAttribute("name", name);
+ model.addAttribute("age", age);
+ model.addAttribute("salary", salary);
+ model.addAttribute("birthday", birthday);
+ return "param";
+ }
+
+ @RequestMapping("param2")
+ public String param2(String name, int age, double salary, Date birthday, Model model) {
+ model.addAttribute("name", name);
+ model.addAttribute("age", age);
+ model.addAttribute("salary", salary);
+ model.addAttribute("birthday", birthday);
+ return "param";
+ }
+
+
+ @PostMapping("param3")
+ public String param3(Programmer programmer, String extendParam, Model model) {
+ System.out.println("extendParam" + extendParam);
+ model.addAttribute("p", programmer);
+ return "param";
+ }
+
+}
+
+```
+
+3.新建param.jsp 文件
+
+```jsp
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ Restful
+
+
+
+ - 姓名：${empty name ? p.name : name}
+ - 年龄：${empty age ? p.age : age}
+ - 薪酬：${empty salary ? p.salary : salary}
+ - 生日：${empty birthday ? p.birthday : birthday}
+
+
+
+
+```
+
+4.启动tomcat，用[postman](https://www.getpostman.com/)软件发送请求进行测试
+
+### 4.2 关于日期格式转换的三种方法
+
+1.如上实例代码所示，在对应的controller中初始化绑定
+
+```java
+@InitBinder
+ protected void initBinder(WebDataBinder binder) {
+ binder.addCustomFormatter(new DateFormatter("yyyy-MM-dd HH:mm:ss"));
+ }
+```
+
+2.利用@DateTimeFormat注解，如果是用实体类去接收参数，则在对应的属性上用@DateTimeFormat和@JsonFormat声明
+
+```java
+public String param(@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date birthday)
+```
+
+3.使用全局的日期格式绑定，新建自定义日期格式转化类，之后在ServletConfig.java中进行注册
+
+```java
+package com.heibaiying.convert;
+
+import org.springframework.core.convert.converter.Converter;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+public class CustomDateConverter implements Converter {
+
+ public Date convert(String s) {
+ try {
+ SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+ return simpleDateFormat.parse(s);
+ } catch (Exception e) {
+ e.printStackTrace();
+ }
+ return null;
+ }
+}
+
+```
+
+ServletConfig.java
+
+```java
+/**
+ * 添加全局日期处理
+ */
+public void addFormatters(FormatterRegistry registry) {
+ registry.addConverter(new CustomDateConverter());
+}
+```
+
+
+
+## 五、数据校验
+
+1.spring支持的数据校验是JSR303的标准，需要引入依赖的jar包
+
+```java
+
+
+ org.hibernate.validator
+ hibernate-validator
+ 6.0.13.Final
+
+
+ javax.validation
+ validation-api
+ 2.0.1.Final
+
+```
+
+2.新建测试ParamValidController.java，主要是在需要校验的参数前加上@Validated，声明参数需要被校验，同时加上bindingResult参数，这个参数中包含了校验的结果
+
+```java
+package com.heibaiying.controller;
+
+import com.heibaiying.bean.Programmer;
+import org.hibernate.validator.constraints.Length;
+import org.springframework.format.annotation.DateTimeFormat;
+import org.springframework.format.datetime.DateFormatter;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.validation.ObjectError;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.WebDataBinder;
+import org.springframework.web.bind.annotation.InitBinder;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * @author : heibaiying
+ * @description :数据校验
+ */
+@RestController
+public class ParamValidController {
+
+
+ @PostMapping("validate")
+ public void valid(@Validated Programmer programmer,
+ BindingResult bindingResult) {
+ List allErrors = bindingResult.getAllErrors();
+ for (ObjectError error : allErrors) {
+ System.out.println(error.getDefaultMessage());
+ }
+ }
+
+}
+
+```
+
+3.在Programmer.java的对应属性上加上注解约束(支持的注解可以在javax.validation.constraints包中查看)
+
+```java
+package com.heibaiying.bean;
+
+import lombok.Data;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+@Data
+public class Programmer {
+
+ @NotNull
+ private String name;
+
+ @Min(value = 0,message = "年龄不能为负数！" )
+ private int age;
+
+ @Min(value = 0,message = "薪酬不能为负数！" )
+ private float salary;
+
+ private String birthday;
+}
+
+```
+
+## 六、文件上传与下载
+
+#### 6.1 文件上传
+
+1.在ServletConfig.java中进行配置，使之支持文件上传
+
+```java
+/**
+* 配置文件上传
+*/
+@Bean
+public CommonsMultipartResolver multipartResolver(){
+ CommonsMultipartResolver resolver = new CommonsMultipartResolver();
+ resolver.setMaxUploadSize(1024*1000*10);
+ resolver.setMaxUploadSizePerFile(1024*1000);
+ resolver.setDefaultEncoding("utf-8");
+ return resolver;
+}
+```
+
+2.新建测试上传的FileController.java
+
+```java
+package com.heibaiying.controller;
+
+import com.heibaiying.utils.FileUtil;
+import org.apache.commons.io.FileUtils;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.servlet.http.HttpSession;
+import java.io.File;
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+
+/**
+ * @author : heibaiying
+ * @description : 文件上传
+ */
+
+@Controller
+public class FileController {
+
+ @GetMapping("file")
+ public String filePage() {
+ return "file";
+ }
+
+
+ /***
+ * 单文件上传
+ */
+ @PostMapping("upFile")
+ public String upFile(MultipartFile file, HttpSession session) {
+ //保存在项目根目录下image文件夹下，如果文件夹不存在则创建
+ FileUtil.saveFile(file, session.getServletContext().getRealPath("/image"));
+ // success.jsp 就是一个简单的成功页面
+ return "success";
+ }
+
+ /***
+ * 多文件上传 多个文件用同一个名字
+ */
+ @PostMapping("upFiles")
+ public String upFiles(@RequestParam(name = "file") MultipartFile[] files, HttpSession session) {
+ for (MultipartFile file : files) {
+ FileUtil.saveFile(file, session.getServletContext().getRealPath("images"));
+ }
+ return "success";
+ }
+
+ /***
+ * 多文件上传方式2 分别为不同文件指定不同名字
+ */
+ @PostMapping("upFiles2")
+ public String upFile(String extendParam,
+ @RequestParam(name = "file1") MultipartFile file1,
+ @RequestParam(name = "file2") MultipartFile file2, HttpSession session) {
+ String realPath = session.getServletContext().getRealPath("images2");
+ FileUtil.saveFile(file1, realPath);
+ FileUtil.saveFile(file2, realPath);
+ System.out.println("extendParam:" + extendParam);
+ return "success";
+ }
+}
+
+```
+
+3.其中工具类FileUtil.java代码如下
+
+```java
+package com.heibaiying.utils;
+
+import org.springframework.web.multipart.MultipartFile;
+import java.io.*;
+
+/**
+ * @author : heibaiying
+ * @description : 文件上传工具类
+ */
+
+public class FileUtil {
+
+ public static String saveFile(MultipartFile file, String path) {
+ InputStream inputStream = null;
+ FileOutputStream outputStream = null;
+ String fullPath = path + File.separator + file.getOriginalFilename();
+ try {
+ File saveDir = new File(path);
+ if (!saveDir.exists()) {
+ saveDir.mkdirs();
+ }
+ outputStream = new FileOutputStream(new File(fullPath));
+ inputStream = file.getInputStream();
+ byte[] bytes = new byte[1024 * 1024];
+ int read;
+ while ((read = inputStream.read(bytes)) != -1) {
+ outputStream.write(bytes, 0, read);
+ }
+ } catch (IOException e) {
+ e.printStackTrace();
+ } finally {
+ if (inputStream != null) {
+ try {
+ inputStream.close();
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+ }
+ if (outputStream != null) {
+ try {
+ outputStream.close();
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+ }
+ }
+ return fullPath;
+ }
+
+}
+```
+
+4.新建用于上传的jsp页面，上传文件时表单必须声明 enctype="multipart/form-data"
+
+```jsp
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ 文件上传
+
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+#### 6.2 文件下载
+
+1.在fileController.java中加上方法：
+
+```java
+ /***
+ * 上传用于下载的文件
+ */
+ @PostMapping("upFileForDownload")
+ public String upFileForDownload(MultipartFile file, HttpSession session, Model model) throws UnsupportedEncodingException {
+ String path = FileUtil.saveFile(file, session.getServletContext().getRealPath("/image"));
+ model.addAttribute("filePath", URLEncoder.encode(path,"utf-8"));
+ model.addAttribute("fileName", file.getOriginalFilename());
+ return "fileDownload";
+ }
+
+ /***
+ * 下载文件
+ */
+ @GetMapping("download")
+ public ResponseEntity downloadFile(String filePath) throws IOException {
+ HttpHeaders headers = new HttpHeaders();
+ File file = new File(filePath);
+ // 解决文件名中文乱码
+ String fileName=new String(file.getName().getBytes("UTF-8"),"iso-8859-1");
+ headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
+ headers.setContentDispositionFormData("attachment", fileName);
+
+ return new ResponseEntity(FileUtils.readFileToByteArray(file),
+ headers, HttpStatus.CREATED);
+ }
+```
+
+2.其中fileDownload.jsp 如下：
+
+```jsp
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ 文件下载
+
+
+ ${fileName}
+
+
+```
+
+
+
+## 七、Restful风格的请求
+
+1.新建Pet.java实体类
+
+```java
+package com.heibaiying.bean;
+
+import lombok.Data;
+
+/**
+ * @author : heibaiying
+ * @description :测试restful风格的实体类
+ */
+
+@Data
+public class Pet {
+
+ private String ownerId;
+
+ private String petId;
+}
+
+```
+
+2.新建RestfulController.java，用@PathVariable和@ModelAttribute注解进行参数绑定。
+
+注： 在REST中，资源通过URL进行识别和定位。REST中的行为是通过HTTP方法定义的。在进行不同行为时对应HTTP方法和Spring注解分别如下：
+
+- 创建资源时：POST（PostMapping）
+- 读取资源时：GET（ @GetMapping）
+- 更新资源时：PUT或PATCH（PutMapping、PatchMapping）
+- 删除资源时：DELETE（DeleteMapping）
+
+```java
+package com.heibaiying.controller;
+
+import com.heibaiying.bean.Pet;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.*;
+
+/**
+ * @author : heibaiying
+ * @description : Restful 风格的请求
+ */
+
+@RestController
+public class RestfulController {
+
+ @GetMapping("restful/owners/{ownerId}/pets/{petId}")
+ public void get(@PathVariable String ownerId, @PathVariable String petId) {
+ System.out.println("ownerId:" + ownerId);
+ System.out.println("petId:" + petId);
+ }
+
+ @GetMapping("restful2/owners/{ownerId}/pets/{petId}")
+ public void get(@ModelAttribute Pet pet) {
+ System.out.println("ownerId:" + pet.getOwnerId());
+ System.out.println("petId:" + pet.getPetId());
+ }
+
+}
+
+```
+
+>>>>>>> 719009b7e434876c2117d82a8a0cb31998acce33
diff --git a/spring/springmvc-base/README.md b/spring/springmvc-base/README.md
index 18982b1..6378667 100644
--- a/spring/springmvc-base/README.md
+++ b/spring/springmvc-base/README.md
@@ -1,7 +1,6 @@
-# springmvc基础（基于xml配置）
-
-
-
## 目录
+# springmvc基础（基于xml配置）
+
+## 目录
一、搭建hello spring工程
1.1 项目搭建
1.2 相关配置讲解
@@ -15,930 +14,931 @@
6.1 文件上传
6.2 文件下载
七、Restful风格的请求
+
## 正文
+## 一、搭建hello spring工程
-## 一、搭建hello spring工程
-
-### 1.1 项目搭建
-
-1.新建maven web工程，并引入相应的依赖
-
-```xml
-
- 5.1.3.RELEASE
-
-
-
-
- org.springframework
- spring-context
- ${spring-base-version}
-
-
- org.springframework
- spring-beans
- ${spring-base-version}
-
-
- org.springframework
- spring-core
- ${spring-base-version}
-
-
- org.springframework
- spring-web
- ${spring-base-version}
-
-
- org.springframework
- spring-webmvc
- ${spring-base-version}
-
-
- javax.servlet
- javax.servlet-api
- 4.0.1
- provided
-
-
-```
-
-2.配置web.xml
-
-```xml
-
-
-
-
-
- springMvc
- org.springframework.web.servlet.DispatcherServlet
-
- contextConfigLocation
- classpath:springApplication.xml
-
- 1
-
-
-
- springMvc
- /
-
-
-
-```
-
-3.在resources下新建springApplication.xml文件，文件内容如下:
-
-```xml
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-```
-
-4.在src 下新建controller用于测试
-
-```java
-package com.heibaiying.controller;
-
-import com.heibaiying.exception.NoAuthException;
-import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.RequestMapping;
-
-/**
- * @author : heibaiying
- * @description : hello spring
- */
-
-@Controller
-@RequestMapping("mvc")
-public class HelloController {
-
- @RequestMapping("hello")
- private String hello() {
- return "hello";
- }
-
-}
-
-```
-
-5.在WEB-INF 下新建jsp文件夹，新建hello.jsp 文件
-
-```jsp
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-
-
- Title
-
-
- Hello Spring MVC!
-
-
-```
-
-6.启动tomcat服务，访问localhost:8080/mvc/hello
-
-### 1.2 相关配置讲解
-
-**1.\**
-
-在web.xml配置中，我们将DispatcherServlet的拦截路径设置为“\”，则spring会捕获所有web请求，包括对静态资源的请求，为了正确处理对静态资源的请求，spring提供了两种解决方案：
-
-- 配置\ ： 配置后，会在Spring MVC上下文中定义一个org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler，它会对进入DispatcherServlet的URL进行筛查，如果发现是静态资源的请求，就将该请求转由Web应用服务器默认的Servlet处理，如果不是静态资源的请求，才由DispatcherServlet继续处理。
-
-- 配置\ ：指定静态资源的位置和路径映射：
-
- ```xml
-
-
-
- ```
-
-**2.\**
-
- 会自动注册DefaultAnnotationHandlerMapping与AnnotationMethodHandlerAdapter
-两个bean,用以支持@Controllers分发请求。并提供了数据绑定、参数转换、json转换等功能，所以必须加上这个配置。
-
-
-
-## 二、配置自定义拦截器
-
-1.创建自定义拦截器，实现接口HandlerInterceptor（这里我们创建两个拦截器，用于测试拦截器方法的执行顺序）
-
-```java
-package com.heibaiying.interceptors;
-
-import org.springframework.web.servlet.HandlerInterceptor;
-import org.springframework.web.servlet.ModelAndView;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
-/**
- * @author : heibaiying
- * @description : spring5 中 preHandle，postHandle，afterCompletion 在接口中被声明为默认方法
- */
-public class MyFirstInterceptor implements HandlerInterceptor {
-
- public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
- System.out.println("进入第一个拦截器preHandle");
- return true;
- }
-
- // 需要注意的是，如果对应的程序报错，不一定会进入这个方法 但一定会进入afterCompletion这个方法
- public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
- System.out.println("进入第一个拦截器postHandle");
- }
-
- public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
- System.out.println("进入第一个拦截器afterCompletion");
- }
-}
-```
-
-```java
-package com.heibaiying.interceptors;
-
-import org.springframework.web.servlet.HandlerInterceptor;
-import org.springframework.web.servlet.ModelAndView;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
-/**
- * @author : heibaiying
- * @description : spring5 中 preHandle，postHandle，afterCompletion 在接口中被声明为默认方法
- */
-public class MySecondInterceptor implements HandlerInterceptor {
-
- public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
- System.out.println("进入第二个拦截器preHandle");
- return true;
- }
-
- public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
- System.out.println("进入第二个拦截器postHandle");
- }
-
- public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
- System.out.println("进入第二个拦截器afterCompletion");
- }
-}
-
-```
-
-2.在springApplication.xml中注册自定义拦截器
-
-```xml
-
-
-
-
-
-
-
-
-
-
-
-
-```
-
-3.关于多个拦截器方法执行顺序的说明
-
-拦截器的执行顺序是按声明的先后顺序执行的，先声明的拦截器中的preHandle方法会先执行，然而它的postHandle方法和afterCompletion方法却会后执行。
-
-
-
-## 三、全局异常处理
-
-1.定义自定义异常
-
-```java
-package com.heibaiying.exception;
-
-/**
- * @author : heibaiying
- * @description : 自定义无权限异常
- */
-public class NoAuthException extends RuntimeException {
-
- public NoAuthException() {
- super();
- }
-
- public NoAuthException(String message) {
- super(message);
- }
-
- public NoAuthException(String message, Throwable cause) {
- super(message, cause);
- }
-
- public NoAuthException(Throwable cause) {
- super(cause);
- }
-
-}
-
-```
-
-2.实现自定义异常处理器
-
-```java
-package com.heibaiying.exception;
-
-import org.springframework.web.servlet.HandlerExceptionResolver;
-import org.springframework.web.servlet.ModelAndView;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
-/**
- * @author : heibaiying
- * @description : 无权限异常处理机制
- */
-public class NoAuthExceptionResolver implements HandlerExceptionResolver {
-
- public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
- if (ex instanceof NoAuthException && !isAjax(request)) {
- return new ModelAndView("NoAuthPage");
- }
- return new ModelAndView();
- }
-
- // 判断是否是Ajax请求
- private boolean isAjax(HttpServletRequest request) {
- return "XMLHttpRequest".equalsIgnoreCase(request.getHeader("X-Requested-With"));
- }
-}
-
-```
-
-3.在springApplication.xml注册自定义异常处理器
-
-```xml
-
-
-```
-
-4.定义测试controller，抛出自定义异常
-
-```java
-@Controller
-@RequestMapping("mvc")
-public class HelloController {
-
- @RequestMapping("hello")
- private String hello() {
- return "hello";
- }
-
-
- @RequestMapping("auth")
- private void auth() {
- throw new NoAuthException("没有对应的访问权限！");
- }
-}
-```
-
-注：调用这个controller时，同时也可以验证在拦截器部分提到的：如果对应的程序报错，拦截器不一定会进入postHandle这个方法 但一定会进入afterCompletion这个方法
-
-
-
-## 四、参数绑定
-
-### 4.1 参数绑定
-
-1.新建Programmer.java
-
-```java
-package com.heibaiying.bean;
-
-import lombok.Data;
-
-/**
- * @author : heibaiying
- * @description :
- */
-@Data
-public class Programmer {
-
- private String name;
-
- private int age;
-
- private float salary;
-
- private String birthday;
-}
-
-```
-
-注：@Data 是lombok包下的注解，用来生成相应的set、get方法，使得类的书写更为简洁。
-
-2.新建ParamBindController.java 文件
-
-```java
-package com.heibaiying.controller;
-
-import com.heibaiying.bean.Programmer;
-import org.springframework.format.annotation.DateTimeFormat;
-import org.springframework.format.datetime.DateFormatter;
-import org.springframework.stereotype.Controller;
-import org.springframework.ui.Model;
-import org.springframework.web.bind.WebDataBinder;
-import org.springframework.web.bind.annotation.InitBinder;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
-
-import java.util.Date;
-
-/**
- * @author : heibaiying
- * @description :参数绑定
- */
-@Controller
-public class ParamBindController {
-
- @InitBinder
- protected void initBinder(WebDataBinder binder) {
- binder.addCustomFormatter(new DateFormatter("yyyy-MM-dd HH:mm:ss"));
- }
-
-
- // 参数绑定与日期格式转换
- @RequestMapping("param")
- public String param(String name, int age, double salary, @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date birthday, Model model) {
- model.addAttribute("name", name);
- model.addAttribute("age", age);
- model.addAttribute("salary", salary);
- model.addAttribute("birthday", birthday);
- return "param";
- }
-
- @RequestMapping("param2")
- public String param2(String name, int age, double salary, Date birthday, Model model) {
- model.addAttribute("name", name);
- model.addAttribute("age", age);
- model.addAttribute("salary", salary);
- model.addAttribute("birthday", birthday);
- return "param";
- }
-
-
- @PostMapping("param3")
- public String param3(Programmer programmer, String extendParam, Model model) {
- System.out.println("extendParam" + extendParam);
- model.addAttribute("p", programmer);
- return "param";
- }
-
-}
-
-```
-
-3.新建param.jsp 文件
-
-```jsp
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-
-
- Restful
-
-
-
- - 姓名：${empty name ? p.name : name}
- - 年龄：${empty age ? p.age : age}
- - 薪酬：${empty salary ? p.salary : salary}
- - 生日：${empty birthday ? p.birthday : birthday}
-
-
-
-
-```
-
-4.启动tomcat，用[postman](https://www.getpostman.com/)软件发送请求进行测试
-
-### 4.2 关于日期格式转换的三种方法
-
-1.如上实例代码所示，在对应的controller中初始化绑定
-
-```java
-@InitBinder
- protected void initBinder(WebDataBinder binder) {
- binder.addCustomFormatter(new DateFormatter("yyyy-MM-dd HH:mm:ss"));
- }
-```
-
-2.利用@DateTimeFormat注解，如果是用实体类去接收参数，则在对应的属性上声明
-
-```java
-public String param(@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date birthday)
-```
-
-3.使用全局的日期格式绑定，新建自定义日期格式转化类，之后在springApplication.xml中进行注册
-
-```java
-package com.heibaiying.convert;
-
-import org.springframework.core.convert.converter.Converter;
-
-import java.text.SimpleDateFormat;
-import java.util.Date;
-
-/**
- * @author : heibaiying
- * @description :
- */
-public class CustomDateConverter implements Converter {
-
- public Date convert(String s) {
- try {
- SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
- return simpleDateFormat.parse(s);
- } catch (Exception e) {
- e.printStackTrace();
- }
- return null;
- }
-}
-
-```
-
-springApplication.xml
-
-```xml
-
-
-
-
-
-
-
-
-```
-
-
-
-## 五、数据校验
-
-1.spring支持的数据校验是JSR303的标准，需要引入依赖的jar包
-
-```java
-
-
- org.hibernate.validator
- hibernate-validator
- 6.0.13.Final
-
-
- javax.validation
- validation-api
- 2.0.1.Final
-
-```
-
-2.新建测试ParamValidController.java，主要是在需要校验的参数前加上@Validated，声明参数需要被校验，同时加上bindingResult参数，这个参数中包含了校验的结果
-
-```java
-package com.heibaiying.controller;
-
-import com.heibaiying.bean.Programmer;
-import org.hibernate.validator.constraints.Length;
-import org.springframework.format.annotation.DateTimeFormat;
-import org.springframework.format.datetime.DateFormatter;
-import org.springframework.stereotype.Controller;
-import org.springframework.ui.Model;
-import org.springframework.validation.BindingResult;
-import org.springframework.validation.ObjectError;
-import org.springframework.validation.annotation.Validated;
-import org.springframework.web.bind.WebDataBinder;
-import org.springframework.web.bind.annotation.InitBinder;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-import javax.validation.constraints.Min;
-import javax.validation.constraints.NotNull;
-import java.util.Date;
-import java.util.List;
-
-/**
- * @author : heibaiying
- * @description :数据校验
- */
-@RestController
-public class ParamValidController {
-
-
- @PostMapping("validate")
- public void valid(@Validated Programmer programmer,
- BindingResult bindingResult) {
- List allErrors = bindingResult.getAllErrors();
- for (ObjectError error : allErrors) {
- System.out.println(error.getDefaultMessage());
- }
- }
-
-}
-
-```
-
-3.在Programmer.java的对应属性上加上注解约束(支持的注解可以在javax.validation.constraints包中查看)
-
-```java
-package com.heibaiying.bean;
-
-import lombok.Data;
-
-import javax.validation.constraints.Min;
-import javax.validation.constraints.NotNull;
-
-/**
- * @author : heibaiying
- * @description :
- */
-@Data
-public class Programmer {
-
- @NotNull
- private String name;
-
- @Min(value = 0,message = "年龄不能为负数！" )
- private int age;
-
- @Min(value = 0,message = "薪酬不能为负数！" )
- private float salary;
-
- private String birthday;
-}
-
-```
-
-## 六、文件上传与下载
-
-#### 6.1 文件上传
-
-1.在springApplication.xml中进行配置，使之支持文件上传
-
-```xml
-
-
-
-
-
-
-
-
-```
-
-2.新建测试上传的FileController.java
-
-```java
-package com.heibaiying.controller;
-
-import com.heibaiying.utils.FileUtil;
-import org.apache.commons.io.FileUtils;
-import org.springframework.http.HttpHeaders;
-import org.springframework.http.HttpStatus;
-import org.springframework.http.MediaType;
-import org.springframework.http.ResponseEntity;
-import org.springframework.stereotype.Controller;
-import org.springframework.ui.Model;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestParam;
-import org.springframework.web.multipart.MultipartFile;
-
-import javax.servlet.http.HttpSession;
-import java.io.File;
-import java.io.IOException;
-import java.io.UnsupportedEncodingException;
-import java.net.URLEncoder;
-
-/**
- * @author : heibaiying
- * @description : 文件上传
- */
-
-@Controller
-public class FileController {
-
- @GetMapping("file")
- public String filePage() {
- return "file";
- }
-
-
- /***
- * 单文件上传
- */
- @PostMapping("upFile")
- public String upFile(MultipartFile file, HttpSession session) {
- //保存在项目根目录下image文件夹下，如果文件夹不存在则创建
- FileUtil.saveFile(file, session.getServletContext().getRealPath("/image"));
- // success.jsp 就是一个简单的成功页面
- return "success";
- }
-
- /***
- * 多文件上传 多个文件用同一个名字
- */
- @PostMapping("upFiles")
- public String upFiles(@RequestParam(name = "file") MultipartFile[] files, HttpSession session) {
- for (MultipartFile file : files) {
- FileUtil.saveFile(file, session.getServletContext().getRealPath("images"));
- }
- return "success";
- }
-
- /***
- * 多文件上传方式2 分别为不同文件指定不同名字
- */
- @PostMapping("upFiles2")
- public String upFile(String extendParam,
- @RequestParam(name = "file1") MultipartFile file1,
- @RequestParam(name = "file2") MultipartFile file2, HttpSession session) {
- String realPath = session.getServletContext().getRealPath("images2");
- FileUtil.saveFile(file1, realPath);
- FileUtil.saveFile(file2, realPath);
- System.out.println("extendParam:" + extendParam);
- return "success";
- }
-}
-
-```
-
-3.其中工具类FileUtil.java代码如下
-
-```java
-package com.heibaiying.utils;
-
-import org.springframework.web.multipart.MultipartFile;
-import java.io.*;
-
-/**
- * @author : heibaiying
- * @description : 文件上传工具类
- */
-
-public class FileUtil {
-
- public static String saveFile(MultipartFile file, String path) {
- InputStream inputStream = null;
- FileOutputStream outputStream = null;
- String fullPath = path + File.separator + file.getOriginalFilename();
- try {
- File saveDir = new File(path);
- if (!saveDir.exists()) {
- saveDir.mkdirs();
- }
- outputStream = new FileOutputStream(new File(fullPath));
- inputStream = file.getInputStream();
- byte[] bytes = new byte[1024 * 1024];
- int read;
- while ((read = inputStream.read(bytes)) != -1) {
- outputStream.write(bytes, 0, read);
- }
- } catch (IOException e) {
- e.printStackTrace();
- } finally {
- if (inputStream != null) {
- try {
- inputStream.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- if (outputStream != null) {
- try {
- outputStream.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- return fullPath;
- }
-
-}
-```
-
-4.新建用于上传的jsp页面，上传文件时表单必须声明 enctype="multipart/form-data"
-
-```jsp
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-
-
- 文件上传
-
-
-
-
-
-
-
-
-
-
-
-
-
-```
-
-#### 6.2 文件下载
-
-1.在fileController.java中加上方法：
-
-```java
- /***
- * 上传用于下载的文件
- */
- @PostMapping("upFileForDownload")
- public String upFileForDownload(MultipartFile file, HttpSession session, Model model) throws UnsupportedEncodingException {
- String path = FileUtil.saveFile(file, session.getServletContext().getRealPath("/image"));
- model.addAttribute("filePath", URLEncoder.encode(path,"utf-8"));
- model.addAttribute("fileName", file.getOriginalFilename());
- return "fileDownload";
- }
-
- /***
- * 下载文件
- */
- @GetMapping("download")
- public ResponseEntity downloadFile(String filePath) throws IOException {
- HttpHeaders headers = new HttpHeaders();
- File file = new File(filePath);
- // 解决文件名中文乱码
- String fileName=new String(file.getName().getBytes("UTF-8"),"iso-8859-1");
- headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
- headers.setContentDispositionFormData("attachment", fileName);
-
- return new ResponseEntity(FileUtils.readFileToByteArray(file),
- headers, HttpStatus.CREATED);
- }
-```
-
-2.其中fileDownload.jsp 如下：
-
-```jsp
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-
-
- 文件下载
-
-
- ${fileName}
-
-
-```
-
-
-
-## 七、Restful风格的请求
-
-1.新建Pet.java实体类
-
-```java
-package com.heibaiying.bean;
-
-import lombok.Data;
-
-/**
- * @author : heibaiying
- * @description :测试restful风格的实体类
- */
-
-@Data
-public class Pet {
-
- private String ownerId;
-
- private String petId;
-}
-
-```
-
-2.新建RestfulController.java，用@PathVariable和@ModelAttribute注解进行参数绑定。
-
-注： 在REST中，资源通过URL进行识别和定位。REST中的行为是通过HTTP方法定义的。在进行不同行为时对应HTTP方法和Spring注解分别如下：
-
-- 创建资源时：POST（PostMapping）
-- 读取资源时：GET（ @GetMapping）
-- 更新资源时：PUT或PATCH（PutMapping、PatchMapping）
-- 删除资源时：DELETE（DeleteMapping）
-
-```java
-package com.heibaiying.controller;
-
-import com.heibaiying.bean.Pet;
-import org.springframework.validation.annotation.Validated;
-import org.springframework.web.bind.annotation.*;
-
-/**
- * @author : heibaiying
- * @description : Restful 风格的请求
- */
-
-@RestController
-public class RestfulController {
-
- @GetMapping("restful/owners/{ownerId}/pets/{petId}")
- public void get(@PathVariable String ownerId, @PathVariable String petId) {
- System.out.println("ownerId:" + ownerId);
- System.out.println("petId:" + petId);
- }
-
- @GetMapping("restful2/owners/{ownerId}/pets/{petId}")
- public void get(@ModelAttribute Pet pet) {
- System.out.println("ownerId:" + pet.getOwnerId());
- System.out.println("petId:" + pet.getPetId());
- }
-
-}
-
-```
-
+### 1.1 项目搭建
+
+1.新建maven web工程，并引入相应的依赖
+
+```xml
+
+ 5.1.3.RELEASE
+
+
+
+
+ org.springframework
+ spring-context
+ ${spring-base-version}
+
+
+ org.springframework
+ spring-beans
+ ${spring-base-version}
+
+
+ org.springframework
+ spring-core
+ ${spring-base-version}
+
+
+ org.springframework
+ spring-web
+ ${spring-base-version}
+
+
+ org.springframework
+ spring-webmvc
+ ${spring-base-version}
+
+
+ javax.servlet
+ javax.servlet-api
+ 4.0.1
+ provided
+
+
+```
+
+2.配置web.xml
+
+```xml
+
+
+
+
+
+ springMvc
+ org.springframework.web.servlet.DispatcherServlet
+
+ contextConfigLocation
+ classpath:springApplication.xml
+
+ 1
+
+
+
+ springMvc
+ /
+
+
+
+```
+
+3.在resources下新建springApplication.xml文件，文件内容如下:
+
+```xml
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+4.在src 下新建controller用于测试
+
+```java
+package com.heibaiying.controller;
+
+import com.heibaiying.exception.NoAuthException;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+/**
+ * @author : heibaiying
+ * @description : hello spring
+ */
+
+@Controller
+@RequestMapping("mvc")
+public class HelloController {
+
+ @RequestMapping("hello")
+ private String hello() {
+ return "hello";
+ }
+
+}
+
+```
+
+5.在WEB-INF 下新建jsp文件夹，新建hello.jsp 文件
+
+```jsp
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ Title
+
+
+ Hello Spring MVC!
+
+
+```
+
+6.启动tomcat服务，访问localhost:8080/mvc/hello
+
+### 1.2 相关配置讲解
+
+**1.\**
+
+在web.xml配置中，我们将DispatcherServlet的拦截路径设置为“\”，则spring会捕获所有web请求，包括对静态资源的请求，为了正确处理对静态资源的请求，spring提供了两种解决方案：
+
+- 配置\ ： 配置后，会在Spring MVC上下文中定义一个org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler，它会对进入DispatcherServlet的URL进行筛查，如果发现是静态资源的请求，就将该请求转由Web应用服务器默认的Servlet处理，如果不是静态资源的请求，才由DispatcherServlet继续处理。
+
+- 配置\ ：指定静态资源的位置和路径映射：
+
+ ```xml
+
+
+
+ ```
+
+**2.\**
+
+ 会自动注册DefaultAnnotationHandlerMapping与AnnotationMethodHandlerAdapter
+两个bean,用以支持@Controllers分发请求。并提供了数据绑定、参数转换、json转换等功能，所以必须加上这个配置。
+
+
+
+## 二、配置自定义拦截器
+
+1.创建自定义拦截器，实现接口HandlerInterceptor（这里我们创建两个拦截器，用于测试拦截器方法的执行顺序）
+
+```java
+package com.heibaiying.interceptors;
+
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @author : heibaiying
+ * @description : spring5 中 preHandle，postHandle，afterCompletion 在接口中被声明为默认方法
+ */
+public class MyFirstInterceptor implements HandlerInterceptor {
+
+ public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
+ System.out.println("进入第一个拦截器preHandle");
+ return true;
+ }
+
+ // 需要注意的是，如果对应的程序报错，不一定会进入这个方法 但一定会进入afterCompletion这个方法
+ public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
+ System.out.println("进入第一个拦截器postHandle");
+ }
+
+ public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
+ System.out.println("进入第一个拦截器afterCompletion");
+ }
+}
+```
+
+```java
+package com.heibaiying.interceptors;
+
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @author : heibaiying
+ * @description : spring5 中 preHandle，postHandle，afterCompletion 在接口中被声明为默认方法
+ */
+public class MySecondInterceptor implements HandlerInterceptor {
+
+ public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
+ System.out.println("进入第二个拦截器preHandle");
+ return true;
+ }
+
+ public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
+ System.out.println("进入第二个拦截器postHandle");
+ }
+
+ public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
+ System.out.println("进入第二个拦截器afterCompletion");
+ }
+}
+
+```
+
+2.在springApplication.xml中注册自定义拦截器
+
+```xml
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+3.关于多个拦截器方法执行顺序的说明
+
+拦截器的执行顺序是按声明的先后顺序执行的，先声明的拦截器中的preHandle方法会先执行，然而它的postHandle方法和afterCompletion方法却会后执行。
+
+
+
+## 三、全局异常处理
+
+1.定义自定义异常
+
+```java
+package com.heibaiying.exception;
+
+/**
+ * @author : heibaiying
+ * @description : 自定义无权限异常
+ */
+public class NoAuthException extends RuntimeException {
+
+ public NoAuthException() {
+ super();
+ }
+
+ public NoAuthException(String message) {
+ super(message);
+ }
+
+ public NoAuthException(String message, Throwable cause) {
+ super(message, cause);
+ }
+
+ public NoAuthException(Throwable cause) {
+ super(cause);
+ }
+
+}
+
+```
+
+2.实现自定义异常处理器
+
+```java
+package com.heibaiying.exception;
+
+import org.springframework.web.servlet.HandlerExceptionResolver;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @author : heibaiying
+ * @description : 无权限异常处理机制
+ */
+public class NoAuthExceptionResolver implements HandlerExceptionResolver {
+
+ public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
+ if (ex instanceof NoAuthException && !isAjax(request)) {
+ return new ModelAndView("NoAuthPage");
+ }
+ return new ModelAndView();
+ }
+
+ // 判断是否是Ajax请求
+ private boolean isAjax(HttpServletRequest request) {
+ return "XMLHttpRequest".equalsIgnoreCase(request.getHeader("X-Requested-With"));
+ }
+}
+
+```
+
+3.在springApplication.xml注册自定义异常处理器
+
+```xml
+
+
+```
+
+4.定义测试controller，抛出自定义异常
+
+```java
+@Controller
+@RequestMapping("mvc")
+public class HelloController {
+
+ @RequestMapping("hello")
+ private String hello() {
+ return "hello";
+ }
+
+
+ @RequestMapping("auth")
+ private void auth() {
+ throw new NoAuthException("没有对应的访问权限！");
+ }
+}
+```
+
+注：调用这个controller时，同时也可以验证在拦截器部分提到的：如果对应的程序报错，拦截器不一定会进入postHandle这个方法 但一定会进入afterCompletion这个方法
+
+
+
+## 四、参数绑定
+
+### 4.1 参数绑定
+
+1.新建Programmer.java
+
+```java
+package com.heibaiying.bean;
+
+import lombok.Data;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+@Data
+public class Programmer {
+
+ private String name;
+
+ private int age;
+
+ private float salary;
+
+ private String birthday;
+}
+
+```
+
+注：@Data 是lombok包下的注解，用来生成相应的set、get方法，使得类的书写更为简洁。
+
+2.新建ParamBindController.java 文件
+
+```java
+package com.heibaiying.controller;
+
+import com.heibaiying.bean.Programmer;
+import org.springframework.format.annotation.DateTimeFormat;
+import org.springframework.format.datetime.DateFormatter;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.WebDataBinder;
+import org.springframework.web.bind.annotation.InitBinder;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+import java.util.Date;
+
+/**
+ * @author : heibaiying
+ * @description :参数绑定
+ */
+@Controller
+public class ParamBindController {
+
+ @InitBinder
+ protected void initBinder(WebDataBinder binder) {
+ binder.addCustomFormatter(new DateFormatter("yyyy-MM-dd HH:mm:ss"));
+ }
+
+
+ // 参数绑定与日期格式转换
+ @RequestMapping("param")
+ public String param(String name, int age, double salary, @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date birthday, Model model) {
+ model.addAttribute("name", name);
+ model.addAttribute("age", age);
+ model.addAttribute("salary", salary);
+ model.addAttribute("birthday", birthday);
+ return "param";
+ }
+
+ @RequestMapping("param2")
+ public String param2(String name, int age, double salary, Date birthday, Model model) {
+ model.addAttribute("name", name);
+ model.addAttribute("age", age);
+ model.addAttribute("salary", salary);
+ model.addAttribute("birthday", birthday);
+ return "param";
+ }
+
+
+ @PostMapping("param3")
+ public String param3(Programmer programmer, String extendParam, Model model) {
+ System.out.println("extendParam" + extendParam);
+ model.addAttribute("p", programmer);
+ return "param";
+ }
+
+}
+
+```
+
+3.新建param.jsp 文件
+
+```jsp
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ Restful
+
+
+
+ - 姓名：${empty name ? p.name : name}
+ - 年龄：${empty age ? p.age : age}
+ - 薪酬：${empty salary ? p.salary : salary}
+ - 生日：${empty birthday ? p.birthday : birthday}
+
+
+
+
+```
+
+4.启动tomcat，用[postman](https://www.getpostman.com/)软件发送请求进行测试
+
+### 4.2 关于日期格式转换的三种方法
+
+1.如上实例代码所示，在对应的controller中初始化绑定
+
+```java
+@InitBinder
+ protected void initBinder(WebDataBinder binder) {
+ binder.addCustomFormatter(new DateFormatter("yyyy-MM-dd HH:mm:ss"));
+ }
+```
+
+2.利用@DateTimeFormat注解，如果是用实体类去接收参数，则在对应的属性上用@DateTimeFormat和@JsonFormat声明
+
+```java
+public String param(@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") Date birthday)
+```
+
+3.使用全局的日期格式绑定，新建自定义日期格式转化类，之后在springApplication.xml中进行注册
+
+```java
+package com.heibaiying.convert;
+
+import org.springframework.core.convert.converter.Converter;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+public class CustomDateConverter implements Converter {
+
+ public Date convert(String s) {
+ try {
+ SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+ return simpleDateFormat.parse(s);
+ } catch (Exception e) {
+ e.printStackTrace();
+ }
+ return null;
+ }
+}
+
+```
+
+springApplication.xml
+
+```xml
+
+
+
+
+
+
+
+
+```
+
+
+
+## 五、数据校验
+
+1.spring支持的数据校验是JSR303的标准，需要引入依赖的jar包
+
+```java
+
+
+ org.hibernate.validator
+ hibernate-validator
+ 6.0.13.Final
+
+
+ javax.validation
+ validation-api
+ 2.0.1.Final
+
+```
+
+2.新建测试ParamValidController.java，主要是在需要校验的参数前加上@Validated，声明参数需要被校验，同时加上bindingResult参数，这个参数中包含了校验的结果
+
+```java
+package com.heibaiying.controller;
+
+import com.heibaiying.bean.Programmer;
+import org.hibernate.validator.constraints.Length;
+import org.springframework.format.annotation.DateTimeFormat;
+import org.springframework.format.datetime.DateFormatter;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.validation.ObjectError;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.WebDataBinder;
+import org.springframework.web.bind.annotation.InitBinder;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * @author : heibaiying
+ * @description :数据校验
+ */
+@RestController
+public class ParamValidController {
+
+
+ @PostMapping("validate")
+ public void valid(@Validated Programmer programmer,
+ BindingResult bindingResult) {
+ List allErrors = bindingResult.getAllErrors();
+ for (ObjectError error : allErrors) {
+ System.out.println(error.getDefaultMessage());
+ }
+ }
+
+}
+
+```
+
+3.在Programmer.java的对应属性上加上注解约束(支持的注解可以在javax.validation.constraints包中查看)
+
+```java
+package com.heibaiying.bean;
+
+import lombok.Data;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+@Data
+public class Programmer {
+
+ @NotNull
+ private String name;
+
+ @Min(value = 0,message = "年龄不能为负数！" )
+ private int age;
+
+ @Min(value = 0,message = "薪酬不能为负数！" )
+ private float salary;
+
+ private String birthday;
+}
+
+```
+
+## 六、文件上传与下载
+
+#### 6.1 文件上传
+
+1.在springApplication.xml中进行配置，使之支持文件上传
+
+```xml
+
+
+
+
+
+
+
+
+```
+
+2.新建测试上传的FileController.java
+
+```java
+package com.heibaiying.controller;
+
+import com.heibaiying.utils.FileUtil;
+import org.apache.commons.io.FileUtils;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.servlet.http.HttpSession;
+import java.io.File;
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+
+/**
+ * @author : heibaiying
+ * @description : 文件上传
+ */
+
+@Controller
+public class FileController {
+
+ @GetMapping("file")
+ public String filePage() {
+ return "file";
+ }
+
+
+ /***
+ * 单文件上传
+ */
+ @PostMapping("upFile")
+ public String upFile(MultipartFile file, HttpSession session) {
+ //保存在项目根目录下image文件夹下，如果文件夹不存在则创建
+ FileUtil.saveFile(file, session.getServletContext().getRealPath("/image"));
+ // success.jsp 就是一个简单的成功页面
+ return "success";
+ }
+
+ /***
+ * 多文件上传 多个文件用同一个名字
+ */
+ @PostMapping("upFiles")
+ public String upFiles(@RequestParam(name = "file") MultipartFile[] files, HttpSession session) {
+ for (MultipartFile file : files) {
+ FileUtil.saveFile(file, session.getServletContext().getRealPath("images"));
+ }
+ return "success";
+ }
+
+ /***
+ * 多文件上传方式2 分别为不同文件指定不同名字
+ */
+ @PostMapping("upFiles2")
+ public String upFile(String extendParam,
+ @RequestParam(name = "file1") MultipartFile file1,
+ @RequestParam(name = "file2") MultipartFile file2, HttpSession session) {
+ String realPath = session.getServletContext().getRealPath("images2");
+ FileUtil.saveFile(file1, realPath);
+ FileUtil.saveFile(file2, realPath);
+ System.out.println("extendParam:" + extendParam);
+ return "success";
+ }
+}
+
+```
+
+3.其中工具类FileUtil.java代码如下
+
+```java
+package com.heibaiying.utils;
+
+import org.springframework.web.multipart.MultipartFile;
+import java.io.*;
+
+/**
+ * @author : heibaiying
+ * @description : 文件上传工具类
+ */
+
+public class FileUtil {
+
+ public static String saveFile(MultipartFile file, String path) {
+ InputStream inputStream = null;
+ FileOutputStream outputStream = null;
+ String fullPath = path + File.separator + file.getOriginalFilename();
+ try {
+ File saveDir = new File(path);
+ if (!saveDir.exists()) {
+ saveDir.mkdirs();
+ }
+ outputStream = new FileOutputStream(new File(fullPath));
+ inputStream = file.getInputStream();
+ byte[] bytes = new byte[1024 * 1024];
+ int read;
+ while ((read = inputStream.read(bytes)) != -1) {
+ outputStream.write(bytes, 0, read);
+ }
+ } catch (IOException e) {
+ e.printStackTrace();
+ } finally {
+ if (inputStream != null) {
+ try {
+ inputStream.close();
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+ }
+ if (outputStream != null) {
+ try {
+ outputStream.close();
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+ }
+ }
+ return fullPath;
+ }
+
+}
+```
+
+4.新建用于上传的jsp页面，上传文件时表单必须声明 enctype="multipart/form-data"
+
+```jsp
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ 文件上传
+
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+#### 6.2 文件下载
+
+1.在fileController.java中加上方法：
+
+```java
+ /***
+ * 上传用于下载的文件
+ */
+ @PostMapping("upFileForDownload")
+ public String upFileForDownload(MultipartFile file, HttpSession session, Model model) throws UnsupportedEncodingException {
+ String path = FileUtil.saveFile(file, session.getServletContext().getRealPath("/image"));
+ model.addAttribute("filePath", URLEncoder.encode(path,"utf-8"));
+ model.addAttribute("fileName", file.getOriginalFilename());
+ return "fileDownload";
+ }
+
+ /***
+ * 下载文件
+ */
+ @GetMapping("download")
+ public ResponseEntity downloadFile(String filePath) throws IOException {
+ HttpHeaders headers = new HttpHeaders();
+ File file = new File(filePath);
+ // 解决文件名中文乱码
+ String fileName=new String(file.getName().getBytes("UTF-8"),"iso-8859-1");
+ headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
+ headers.setContentDispositionFormData("attachment", fileName);
+
+ return new ResponseEntity(FileUtils.readFileToByteArray(file),
+ headers, HttpStatus.CREATED);
+ }
+```
+
+2.其中fileDownload.jsp 如下：
+
+```jsp
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ 文件下载
+
+
+ ${fileName}
+
+
+```
+
+
+
+## 七、Restful风格的请求
+
+1.新建Pet.java实体类
+
+```java
+package com.heibaiying.bean;
+
+import lombok.Data;
+
+/**
+ * @author : heibaiying
+ * @description :测试restful风格的实体类
+ */
+
+@Data
+public class Pet {
+
+ private String ownerId;
+
+ private String petId;
+}
+
+```
+
+2.新建RestfulController.java，用@PathVariable和@ModelAttribute注解进行参数绑定。
+
+注： 在REST中，资源通过URL进行识别和定位。REST中的行为是通过HTTP方法定义的。在进行不同行为时对应HTTP方法和Spring注解分别如下：
+
+- 创建资源时：POST（PostMapping）
+- 读取资源时：GET（ @GetMapping）
+- 更新资源时：PUT或PATCH（PutMapping、PatchMapping）
+- 删除资源时：DELETE（DeleteMapping）
+
+```java
+package com.heibaiying.controller;
+
+import com.heibaiying.bean.Pet;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.*;
+
+/**
+ * @author : heibaiying
+ * @description : Restful 风格的请求
+ */
+
+@RestController
+public class RestfulController {
+
+ @GetMapping("restful/owners/{ownerId}/pets/{petId}")
+ public void get(@PathVariable String ownerId, @PathVariable String petId) {
+ System.out.println("ownerId:" + ownerId);
+ System.out.println("petId:" + petId);
+ }
+
+ @GetMapping("restful2/owners/{ownerId}/pets/{petId}")
+ public void get(@ModelAttribute Pet pet) {
+ System.out.println("ownerId:" + pet.getOwnerId());
+ System.out.println("petId:" + pet.getPetId());
+ }
+
+}
+
+```
+
+>>>>>>> 719009b7e434876c2117d82a8a0cb31998acce33