spring boot+thymeleaf 文件上传，下载功能实现

1，pom.xml文件添加thymeleaf依赖

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency>

properties文件设置thymeleaf

# thymeleaf spring.thymeleaf.prefix=classpath:/templates/ spring.thymeleaf.check-template-location=true spring.thymeleaf.suffix=.html spring.thymeleaf.encoding=UTF-8 spring.thymeleaf.content-type=text/html spring.thymeleaf.mode=HTML5 spring.thymeleaf.cache=false server.port=8082 # Single file max size spring.servlet.multipart.max-file-size=100MB # All files max size spring.servlet.multipart.max-request-size=100MB

2，controller类

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; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.*; import java.util.List; @Controller public class FileUploadController { /* * 获取file.html页面 */ @RequestMapping("file") public String file(){ return "/file"; } /** * 实现文件上传 * */ @RequestMapping("fileUpload") @ResponseBody public String fileUpload(@RequestParam("fileName") MultipartFile file){ if(file.isEmpty()){ return "false"; } String fileName = file.getOriginalFilename(); int size = (int) file.getSize(); System.out.println(fileName + "-->" + size); String path = "F:/test" ; File dest = new File(path + "/" + fileName); if(!dest.getParentFile().exists()){ //判断文件父目录是否存在 dest.getParentFile().mkdir(); } try { file.transferTo(dest); //保存文件 return "true"; } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); return "false"; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); return "false"; } } /* * 获取multifile.html页面 */ @RequestMapping("multifile") public String multifile(){ return "/multifile"; } /** * 实现多文件上传 * */ @RequestMapping(value="multifileUpload",method= RequestMethod.POST) /**public @ResponseBody String multifileUpload(@RequestParam("fileName")List<MultipartFile> files) */ public @ResponseBody String multifileUpload(HttpServletRequest request){ List<MultipartFile> files = ((MultipartHttpServletRequest)request).getFiles("fileName"); if(files.isEmpty()){ return "false"; } 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 "false"; }else{ File dest = new File(path + "/" + fileName); if(!dest.getParentFile().exists()){ //判断文件父目录是否存在 dest.getParentFile().mkdir(); } try { file.transferTo(dest); }catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); return "false"; } } } return "true"; } @RequestMapping("download") public String download(){ return "/download"; } //文件下载 @RequestMapping("downLoadFile") public String downLoadFile(HttpServletResponse response) throws UnsupportedEncodingException { String filename="22.jpg";//此处应该选择公共区域的文件，下载到本地 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/vnd.ms-excel;charset=UTF-8"); response.setCharacterEncoding("UTF-8"); // response.setContentType("application/force-download"); response.setHeader("Content-Disposition", "attachment;fileName=" + java.net.URLEncoder.encode(filename,"UTF-8")); 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) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("----------file download---" + filename); try { bis.close(); fis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return null; } }

3，html代码如下:

file.html 单个文件上传

<!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>文件上传</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>

4，上传结果

返回true即上传成功

多个软件上传和下载在源码 这里