一、创建简单的springboot-web项目
二、文件上传属性配置
#默认支持文件上传spring.http.multipart.enabled =truespring.http.multipart.file-size-threshold =0# 上传文件的临时目录#spring.http.multipart.location=E:/upload/temp/# 最大支持文件大小spring.http.multipart.max-file-size =100MB# 最大支持请求大小spring.http.multipart.max-request-size =100Mb
三、文件上传代码
1.Controller层代码：
@RestControllerpublic class UploadController { private static final Logger LOGGER = LoggerFactory.getLogger(UploadController.class); @GetMapping("/toUpload") public String upload() { return "upload"; } @PostMapping("/upload") public String UploadFile(@RequestParam("file") MultipartFile file) { if (file.isEmpty()) { return "请选择文件"; } //获取文件名 String fileName = file.getOriginalFilename(); String filePath = "C:/Users/upload/"; File dest = new File(filePath + fileName); try { file.transferTo(dest); LOGGER.info("上传成功"); return "上传成功"; } catch (IOException e) { LOGGER.error(e.toString(), e); } return "上传失败！"; }} 2.jsp代码
<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>单文件上传
四、文件下载代码
@RequestMapping(value = "/download", method = RequestMethod.GET) @ResponseBody public String testDownload(HttpServletResponse res,HttpServletRequest request) { String fileName = "xxx.txt"; String filePath = "D:/uploadFile"; File file = new File(filePath + "/" + fileName); System.out.println(file); if (file.exists()){//判断文件是否存在 //判断浏览器是否为火狐 try { if ("FF".equals(getBrowser(request))) { // 火狐浏览器 设置编码new String(realName.getBytes("GB2312"), "ISO-8859-1"); fileName = new String(fileName.getBytes("GB2312"), "ISO-8859-1"); }else{ fileName = URLEncoder.encode(fileName, "UTF-8");//encode编码UTF-8 解决大多数中文乱码 fileName = fileName.replace("+", "%20");//encode后替换空格 解决空格问题 } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } res.setContentType("application/force-download");//设置强制下载 res.setHeader("Content-Disposition", "attachment;filename=" + fileName);//设置文件名 byte[] buff = new byte[1024];// 用来存储每次读取到的字节数组 //创建输入流（读文件）输出流（写文件） BufferedInputStream bis = null; OutputStream os = null; try { os = res.getOutputStream(); bis = new BufferedInputStream(new FileInputStream(file)); 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(); } } if (os != null){ try { os.close(); } catch (IOException e) { e.printStackTrace(); } } } }else { return "文件不存在！！！"; } return "download success"; } /** * @Title: getBrowser * @Description: 判断客户端浏览器 * @return String * @author * @date */ private static String getBrowser(HttpServletRequest request) { String UserAgent = request.getHeader("USER-AGENT").toLowerCase(); if (UserAgent != null) { if (UserAgent.indexOf("msie") != -1) return "IE"; if (UserAgent.indexOf("firefox") != -1) return "FF"; if (UserAgent.indexOf("safari") != -1) return "SF"; } return null; }} 五、测试