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private String uploadFields(HttpServletRequest request,

           Map<String, String> map) {

       // 獲取request中的請求參數

       DiskFileItemFactory dfif = new DiskFileItemFactory();

       ServletFileUpload sfu = new ServletFileUpload(dfif);

       sfu.setHeaderEncoding("UTF-8");

       String file = null;

       try {

           List<FileItem> list = sfu.parseRequest(request);

           // 遍歷所有參數

           for (Iterator<FileItem> its = list.iterator(); its.hasNext();) {

               FileItem fi = its.next();

              // 是否為表單字段，如果不是則為文件上傳輸入流。

              if (!fi.isFormField()) {

                  InputStream is = fi.getInputStream();

                  // 獲取圖片目錄

                  String dir = this.getServletContext().getRealPath("/")

                         + "/images/";

                  File dirF = new File(dir);

                  if (!dirF.exists())

                     dirF.mkdirs();

                  // 使用UUID創建文件名稱

                  file = UUID.randomUUID().toString()

                         + fi.getName().substring(

                                fi.getName().lastIndexOf("."));

                  // 寫出文件

                  byte[] buf = new byte[1024];

                  int len = 0;

                  FileOutputStream fos = new FileOutputStream(new File(dir

                         + file));

                  while ((len = is.read(buf)) != -1) {

                     fos.write(buf, 0, len);

                  }

                  // 關閉流

                  fos.close();

                  is.close();

                  fi.delete();

              } else {

                  // 如果為表單字段，則將這些信息添加到map中返回給調用函數

                  // filter無法對文件上傳進行過濾，所以需要手動對編碼轉換。

                  map.put(fi.getFieldName(), new String(fi.getString()

                         .getBytes("iso8859-1"), "UTF-8"));

              }

           }

       } catch (Exception e) {

           e.printStackTrace();

       }

       // 返回在服務器保存后的文件路徑。

       return "images/" + file;

    }