1、SpringBoot 项目搭建过程略；
2、上传下载Controller
package com.spqin.updownload.controller; /** * 文件上传和下载 * @author Spqin * @Date 2020/12/3 9:39 */ 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.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 @RequestMapping("/file") public class FileUpDownLoadController { /** * 上传文件存放路径 */ private String filePath = "D:/Test/upload/"; /** * 上传，支持多文件上传 * @param request * @return */ @RequestMapping(value = "upload", method = RequestMethod.POST) @ResponseBody public String fileUpload(HttpServletRequest request) { List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file"); MultipartFile file = null; BufferedOutputStream stream = null; for (int i = 0; i < files.size(); ++i) { file = files.get(i); if (!file.isEmpty()) { try { //test.txt String uploadFilePath = file.getOriginalFilename(); //test String uploadFileName = uploadFilePath.substring(0,uploadFilePath.indexOf('.')); //txt String uploadFileSuffix = uploadFilePath.substring(uploadFilePath.indexOf('.') + 1, uploadFilePath.length()); stream = new BufferedOutputStream(new FileOutputStream(new File( filePath +uploadFilePath))); byte[] bytes = file.getBytes(); stream.write(bytes,0,bytes.length); } catch (Exception e) { e.printStackTrace(); } finally { try { if (stream != null) { stream.close(); } } catch (IOException e) { e.printStackTrace(); } } } else { System.out.println("上传文件为空"); } } System.out.println("文件接受成功了"); return "Success"; } /** * 下载 * @param res * @param fileName */ @RequestMapping(value = "/download", method = RequestMethod.GET) public void fileDownload(HttpServletResponse res,String fileName) { res.setHeader("content-type", "application/octet-stream"); res.setContentType("application/octet-stream"); res.setHeader("Content-Disposition", "attachment;filename=" + fileName); byte[] buff = new byte[1024]; BufferedInputStream bis = null; OutputStream os = null; try { os = res.getOutputStream(); bis = new BufferedInputStream(new FileInputStream(new File(filePath + fileName))); int i = bis.read(buff); while (i != -1) { os.write(buff, 0, buff.length); os.flush(); i = bis.read(buff); } } catch (IOException e) { e.printStackTrace(); } finally { if (bis != null) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); } } } System.out.println("success"); } }
3、浏览器上传下载测试
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <form method="POST" enctype="multipart/form-data" action="http://localhost:8080/updownload/file/upload"> <p>文件1：<input type="file" name="file" /></p> <p>文件2：<input type="file" name="file" /></p> <p><input type="submit" value="上传" /></p> </form> <a href="http://localhost:8080/updownload/file/download?fileName=test.txt">下载</a> </body> </html>