SpringBoot实现文件上传下载功能小结

 // 单文件上传 @RequestMapping(value = "/upload") @ResponseBody public String upload(@RequestParam("file") MultipartFile file) { try { if (file.isEmpty()) { return "文件为空"; } // 获取文件名 String fileName = file.getOriginalFilename(); logger.info("上传的文件名为：" + fileName); // 获取文件的后缀名 String suffixName = fileName.substring(fileName.lastIndexOf(".")); logger.info("文件的后缀名为：" + suffixName); // 设置文件存储路径 String filePath = "D://aim//"; String path = filePath + fileName + suffixName; File dest = new File(path); // 检测是否存在目录 if (!dest.getParentFile().exists()) { dest.getParentFile().mkdirs();// 新建文件夹 } file.transferTo(dest);// 文件写入 return "上传成功"; } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return "上传失败"; }

 //多文件上传 @RequestMapping(value = "/uploadMore", method = RequestMethod.POST) @ResponseBody public String handleFileUpload(HttpServletRequest request) { List files = ((MultipartHttpServletRequest) request).getFiles("file"); MultipartFile file = null; BufferedOutputStream stream = null; for (int i = 0; i  " + e.getMessage(); } } else { return "第 " + i + " 个文件上传失败因为文件为空"; } } return "上传成功"; }

 //文件下载相关代码 @RequestMapping("/download") public String downloadFile(HttpServletRequest request, HttpServletResponse response) { String fileName = "aim_test.txt";// 设置文件名，根据业务需要替换成要下载的文件名 if (fileName != null) { //设置文件路径 String realPath = "D://aim//" File file = new File(realPath , fileName); if (file.exists()) { response.setContentType("application/force-download");// 设置强制下载不打开 response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);// 设置文件名 byte[] buffer = new byte[1024]; FileInputStream fis = null; BufferedInputStream bis = null; try { fis = new FileInputStream(file); bis = new BufferedInputStream(fis); OutputStream os = response.getOutputStream(); int i = bis.read(buffer); while (i != -1) { os.write(buffer, 0, i); i = bis.read(buffer); } System.out.println("success"); } catch (Exception e) { e.printStackTrace(); } finally { if (bis != null) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); } } if (fis != null) { try { fis.close(); } catch (IOException e) { e.printStackTrace(); } } } } } return null; }

 @Configuration public class MultipartConfig { @Bean public MultipartConfigElement multipartConfigElement() { MultipartConfigFactory factory = new MultipartConfigFactory(); // 置文件大小限制 ,超出此大小页面会抛出异常信息 factory.setMaxFileSize("2MB"); //KB,MB // 设置总上传数据总大小 factory.setMaxRequestSize("20MB"); // 设置文件临时文件夹路径 // factory.setLocation("E://test//"); // 如果文件大于这个值，将以文件的形式存储，如果小于这个值文件将存储在内存中，默认为0 // factory.setMaxRequestSize(0); return factory.createMultipartConfig(); } }