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luoxiang 2018-12-19 21:59:45 +08:00
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spring/springmvc-base-annotation/README.md
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@ -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 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());
}
}
```

556
spring/springmvc-base/README.md
View File

@ -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 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());
}
}
```

3
spring/springmvc-base/src/main/java/com/heibaiying/controller/FileController.java
View File

@ -69,6 +69,9 @@ public class FileController {
} }
/***
* 上传用于下载的文件
*/
@PostMapping("upFileForDownload") @PostMapping("upFileForDownload")
public String upFileForDownload(MultipartFile file, HttpSession session, Model model) throws UnsupportedEncodingException { public String upFileForDownload(MultipartFile file, HttpSession session, Model model) throws UnsupportedEncodingException {
String path = FileUtil.saveFile(file, session.getServletContext().getRealPath("/image")); String path = FileUtil.saveFile(file, session.getServletContext().getRealPath("/image"));