SSM 實現文件下載功能（用postman測試）

1. 前端只用傳文件的路徑即可。 如：String path = “D:\user\test.docx”;
2. controller

   @Autowired
   FileService fileService;
   /**
    * 前端傳文件路徑來下載文件
    *
    * @param path 文件路徑，如 /guide/appendix.doc
    * @param response
    * @return
    */
   @RequestMapping(value = "/download")
   @ResponseBody
   public CommonReturnType downloadAppendix(@Param("path") String path, HttpServletRequest request, HttpServletResponse response) {
       fileService.downloadFile(path,request,response);
       return CommonReturnType.create(null, "下載完成");
   }

3. service

   @Override
   public void downloadFile(String path, HttpServletRequest request, HttpServletResponse response) {
       try {
           //String pathTest = "D:\\UPC\\offer"+"\\"+fileName;
           //轉碼，免得文件名中文亂碼(有時候加上反而會亂碼)
           // fileName = URLEncoder.encode(fileName,"UTF-8");
   
           //從路徑中獲取文件名稱，trim：去除字符串前后的空格
           File tempFile = new File(path.trim());
           String filename = tempFile.getName();
   
           //解決中文文件名亂碼
           String userAgent = request.getHeader("User-Agent");
           //IE內核瀏覽器
           if (userAgent.contains("MSIE") || userAgent.contains("Trident")) {
               filename = java.net.URLEncoder.encode(filename, "UTF-8");
           } else {
               // 非IE瀏覽器的處理：
               filename = new String(filename.getBytes("UTF-8"), "ISO-8859-1");
           }
           //設置文件下載頭
           response.setHeader("Content-disposition",String.format("attachment; filename=\"%s\"", filename));
           //設置文件ContentType類型，這樣設置，會自動判斷下載文件類型
           response.setContentType("multipart/form-data");
           response.setCharacterEncoding("UTF-8");
   
           InputStream inputStream = new BufferedInputStream(new FileInputStream(new File(path)));
           BufferedOutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
           //創建緩沖區
           byte[] buffer = new byte[1024];
           int length;
           while ((length = inputStream.read(buffer)) != -1) {
               outputStream.write(buffer, 0, length);
               outputStream.flush();
           }
           //關閉流
           inputStream.close();
           outputStream.close();
       } catch (IOException e) {
           e.printStackTrace();
       }
   }

4. postman測試

    

    本人完整調試，簡單標准實現文件下載