增加代码说明

2018-12-19 21:59:45 +08:00
parent d5f03cbfff
commit 47d65ac6b3
3 changed files with 1118 additions and 2 deletions
--- a/spring/springmvc-base-annotation/README.md
+++ b/spring/springmvc-base-annotation/README.md
@@ -370,3 +370,560 @@ public class HelloController {
 ```
 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方法和全参、无参构造器，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" %>
 <html>
 <head>
    <title>Restful</title>
 </head>
 <body>
 <ul>
    <li>姓名：${empty name ? p.name : name}</li>
    <li>年龄：${empty age ? p.age : age}</li>
    <li>薪酬：${empty salary ? p.salary : salary}</li>
    <li>生日：${empty birthday ? p.birthday : birthday}</li>
 </ul>
 </body>
 </html>
 ```
 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<String, Date> {
    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
 <!-- 数据校验依赖包 -->
      <dependency>
            <groupId>org.hibernate.validator</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>6.0.13.Final</version>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>2.0.1.Final</version>
        </dependency>
 ```
 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<ObjectError> 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.*;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 /**
 * @author : heibaiying
 * @description : 文件上传工具类
 */
 public class FileUtil {
    public static String saveFile(MultipartFile file, String path) {
        String fullPath = path + File.separator + file.getOriginalFilename();
        try {
            File saveDir = new File(path);
            if (!saveDir.exists()) {
                saveDir.mkdirs();
            }
            FileOutputStream outputStream = new FileOutputStream(new File(fullPath));
            InputStream 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();
        }
        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" %>
 <html>
 <head>
    <title>文件上传</title>
    <link rel="stylesheet" href="${pageContext.request.contextPath}/css/file.css">
 </head>
 <body>
    <form action="${pageContext.request.contextPath }/upFile" method="post" enctype="multipart/form-data">
        请选择上传文件：<input name="file" type="file"><br>
        <input type="submit" value="点击上传文件">
    </form>
    <form action="${pageContext.request.contextPath }/upFiles" method="post" enctype="multipart/form-data">
        请选择上传文件(多选)：<input name="file" type="file" multiple><br>
        <input type="submit" value="点击上传文件">
    </form>
    <form action="${pageContext.request.contextPath }/upFiles2" method="post" enctype="multipart/form-data">
        请选择上传文件1：<input name="file1" type="file"><br>
        请选择上传文件2：<input name="file2" type="file"><br>
        文件内容额外备注: <input name="extendParam" type="text"><br>
        <input type="submit" value="点击上传文件">
    </form>
 </body>
 </html>
 ```
 #### 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<byte[]> 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<byte[]>(FileUtils.readFileToByteArray(file),
                headers, HttpStatus.CREATED);
    }
 ```
 2.其中fileDownload.jsp 如下：
 ```jsp
 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 <html>
 <head>
    <title>文件下载</title>
 </head>
 <body>
    <a href="${pageContext.request.contextPath}/download?filePath=${filePath}">${fileName}</a>
 </body>
 </html>
 ```
 ## 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());
    }
 }
 ```
--- a/spring/springmvc-base/README.md
+++ b/spring/springmvc-base/README.md
@@ -362,3 +362,559 @@ public class HelloController {
 ```
 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方法和全参、无参构造器，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" %>
 <html>
 <head>
    <title>Restful</title>
 </head>
 <body>
 <ul>
    <li>姓名：${empty name ? p.name : name}</li>
    <li>年龄：${empty age ? p.age : age}</li>
    <li>薪酬：${empty salary ? p.salary : salary}</li>
    <li>生日：${empty birthday ? p.birthday : birthday}</li>
 </ul>
 </body>
 </html>
 ```
 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<String, Date> {
    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
 <!-- 全局日期格式转换  -->
    <bean id="formattingConversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
    <property name="converters">
        <list>
            <bean class="com.heibaiying.convert.CustomDateConverter"/>
        </list>
    </property>
    </bean>
 ```
 ## 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
 <!-- 数据校验依赖包 -->
      <dependency>
            <groupId>org.hibernate.validator</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>6.0.13.Final</version>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>2.0.1.Final</version>
        </dependency>
 ```
 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<ObjectError> 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
 <!--配置文件上传-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
         <!--文件最大限制-->
        <property name="maxUploadSize" value="102400000"/>
          <!--单个文件最大限制-->
        <property name="maxUploadSizePerFile" value="10240000"/>
        <property name="defaultEncoding" value="utf-8"/>
    </bean>
 ```
 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.*;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 /**
 * @author : heibaiying
 * @description : 文件上传工具类
 */
 public class FileUtil {
    public static String saveFile(MultipartFile file, String path) {
        String fullPath = path + File.separator + file.getOriginalFilename();
        try {
            File saveDir = new File(path);
            if (!saveDir.exists()) {
                saveDir.mkdirs();
            }
            FileOutputStream outputStream = new FileOutputStream(new File(fullPath));
            InputStream 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();
        }
        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" %>
 <html>
 <head>
    <title>文件上传</title>
    <link rel="stylesheet" href="${pageContext.request.contextPath}/css/file.css">
 </head>
 <body>
    <form action="${pageContext.request.contextPath }/upFile" method="post" enctype="multipart/form-data">
        请选择上传文件：<input name="file" type="file"><br>
        <input type="submit" value="点击上传文件">
    </form>
    <form action="${pageContext.request.contextPath }/upFiles" method="post" enctype="multipart/form-data">
        请选择上传文件(多选)：<input name="file" type="file" multiple><br>
        <input type="submit" value="点击上传文件">
    </form>
    <form action="${pageContext.request.contextPath }/upFiles2" method="post" enctype="multipart/form-data">
        请选择上传文件1：<input name="file1" type="file"><br>
        请选择上传文件2：<input name="file2" type="file"><br>
        文件内容额外备注: <input name="extendParam" type="text"><br>
        <input type="submit" value="点击上传文件">
    </form>
 </body>
 </html>
 ```
 #### 6.2 文件下载
 1.在fileController.java中加上方法：
 ```java
  /***
   * 上传用于下载的文件
   */
    @PostMapping("upFileForDownload")
    public String upFileForDownload(MultipartFile file, HttpSession session, Model model) throws UnsupportedEncodingException {
        String path = FileUtil.saveFile(file, session.getServletContext().getRealPath("/image"));
        model.addAttribute("filePath", URLEncoder.encode(path,"utf-8"));
        model.addAttribute("fileName", file.getOriginalFilename());
        return "fileDownload";
    }
    /***
     * 下载文件
     */
    @GetMapping("download")
    public ResponseEntity<byte[]> downloadFile(String filePath) throws IOException {
        HttpHeaders headers = new HttpHeaders();
        File file = new File(filePath);
        // 解决文件名中文乱码
        String fileName=new String(file.getName().getBytes("UTF-8"),"iso-8859-1");
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        headers.setContentDispositionFormData("attachment", fileName);
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),
                headers, HttpStatus.CREATED);
    }
 ```
 2.其中fileDownload.jsp 如下：
 ```jsp
 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 <html>
 <head>
    <title>文件下载</title>
 </head>
 <body>
    <a href="${pageContext.request.contextPath}/download?filePath=${filePath}">${fileName}</a>
 </body>
 </html>
 ```
 ## 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());
    }
 }
 ```
--- a/spring/springmvc-base/src/main/java/com/heibaiying/controller/FileController.java
+++ b/spring/springmvc-base/src/main/java/com/heibaiying/controller/FileController.java
@@ -69,6 +69,9 @@ public class FileController {
    }
     /***
      * 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"));