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private String uploadFields(HttpServletRequest request,

           Map<String, String> map) {

       // 获取request中的请求参数

       DiskFileItemFactory dfif = new DiskFileItemFactory();

       ServletFileUpload sfu = new ServletFileUpload(dfif);

       sfu.setHeaderEncoding("UTF-8");

       String file = null;

       try {

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

           // 遍历所有参数

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

               FileItem fi = its.next();

              // 是否为表单字段，如果不是则为文件上传输入流。

              if (!fi.isFormField()) {

                  InputStream is = fi.getInputStream();

                  // 获取图片目录

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

                         + "/images/";

                  File dirF = new File(dir);

                  if (!dirF.exists())

                     dirF.mkdirs();

                  // 使用UUID创建文件名称

                  file = UUID.randomUUID().toString()

                         + fi.getName().substring(

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

                  // 写出文件

                  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);

                  }

                  // 关闭流

                  fos.close();

                  is.close();

                  fi.delete();

              } else {

                  // 如果为表单字段，则将这些信息添加到map中返回给调用函数

                  // filter无法对文件上传进行过滤，所以需要手动对编码转换。

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

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

              }

           }

       } catch (Exception e) {

           e.printStackTrace();

       }

       // 返回在服务器保存后的文件路径。

       return "images/" + file;

    }