1. 引入相关依赖， 重点是thymeleaf依赖
pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>2.在 application.properties 【src/main/resources】配置
spring.thymeleaf.cache=false
spring.thymeleaf.prefix=classpath:/templates/3.html文件
fileUpload.html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
<meta charset="UTF-8" />
<title>fileUpload page</title>
</head>
<body>
<h1 th:inlines="text">文件上传</h1>
<form action="fileUpload" method="post" enctype="multipart/form-data">
<p>选择文件: <input type="file" name="fileName"/></p>
<p><input type="submit" value="提交"/></p>
</form>
</body>
</html>multifileUpload.html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
<meta charset="UTF-8" />
<title>multifileUpload page</title>
</head>
<body>
<h1 th:inlines="text">文件上传</h1>
<form action="multifileUpload" method="post" enctype="multipart/form-data" >
<p>选择文件1: <input type="file" name="fileName"/></p>
<p>选择文件2: <input type="file" name="fileName"/></p>
<p>选择文件3: <input type="file" name="fileName"/></p>
<p><input type="submit" value="提交"/></p>
</form>
</body>
</html>4.我这边是用文件上传的demo测试的，顺便把文件上传的controller代码也贴一下：
FileUploadController.java
package com.example.demo;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
@Controller //此处必须是@Controller，@RestController不行
public class FileUploadController {
private final static Logger logger = LoggerFactory.getLogger(MyController.class);
/**
http://ip:port/file
*/
@RequestMapping("/file")
public String file() {
logger.info("单文件上传页面");
return "/fileUpload";
}
/**
http://ip:port/multifile
*/
@RequestMapping("/multifile")
public String multifile() {
logger.info("多文件上传页面");
return "/multifileUpload";
}
/**
* 实现单文件上传
*http://ip:port/fileUpload
* */
@RequestMapping("fileUpload")
@ResponseBody
public String fileUpload(@RequestParam("fileName") MultipartFile file){
if(file.isEmpty()){
return "this file is empty";
}
String fileName = file.getOriginalFilename();
int size = (int) file.getSize();
System.out.println(fileName + "-->" + size);
String path = "F:/test" ;//文件保存路径
File targetFile = new File(path + "/" + fileName);
if(!targetFile.getParentFile().exists()){ //判断文件父目录是否存在
targetFile.getParentFile().mkdir();
}
try {
file.transferTo(targetFile); //保存文件
return "upload file success";
} catch (IllegalStateException e) {
e.printStackTrace();
return "upload file fail";
} catch (IOException e) {
e.printStackTrace();
return "upload file fail";
}
}
/**
* 实现多文件上传
* http://ip:port/multifileUpload
* */
@RequestMapping(value="multifileUpload",method=RequestMethod.POST)
public @ResponseBody String multifileUpload(HttpServletRequest request){
List<MultipartFile> files = ((MultipartHttpServletRequest)request).getFiles("fileName");
if(files.isEmpty()){
return "this file is empty";
}
String path = "F:/test" ;
for(MultipartFile file:files){
String fileName = file.getOriginalFilename();
int size = (int) file.getSize();
System.out.println(fileName + "-->" + size);
if(file.isEmpty()){
return "this file is empty";
}else{
File targetFile= new File(path + "/" + fileName);
if(!targetFile.getParentFile().exists()){ //判断文件父目录是否存在
targetFile.getParentFile().mkdir();
}
try {
file.transferTo(targetFile);
}catch (Exception e) {
e.printStackTrace();
return "upload file fail";
}
}
}
return "upload file success";
}
@RequestMapping("download")
public String downLoad(HttpServletResponse response){
String filename="test.jpg";
String filePath = "F:/test" ;
File file = new File(filePath + "/" + filename);
if(file.exists()){ //判断文件父目录是否存在
response.setContentType("application/force-download");
response.setHeader("Content-Disposition", "attachment;fileName=" + filename);
byte[] buffer = new byte[1024];
FileInputStream fis = null; //文件输入流
BufferedInputStream bis = null;
OutputStream os = null; //输出流
try {
os = response.getOutputStream();
fis = new FileInputStream(file);
bis = new BufferedInputStream(fis);
int i = bis.read(buffer);
while(i != -1){
os.write(buffer);
i = bis.read(buffer);
}
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("file download: " + filename);
try {
bis.close();
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
}
5.访问
