java 表单上传

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    String end = "\r\n";
       String twoHyphens = "--";
       String boundary = "-------------------------7de16713908a8";
       try
       {
           URL url =new URL(actionUrl);
           HttpURLConnection con=(HttpURLConnection)url.openConnection();
           /* 允许Input、Output，不使用Cache */
           con.setDoInput(true);
           con.setDoOutput(true);
           con.setUseCaches(false);
           /* 设置传送的method=POST */
           con.setRequestMethod("POST");
           /* setRequestProperty */

           con.setRequestProperty("Connection", "Keep-Alive");
           con.setRequestProperty("Charset", "UTF-8");
           con.setRequestProperty("Content-Type","multipart/form-data;boundary="+boundary);
           con.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
           con.setRequestProperty("User-Agent", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)");

           con.setRequestProperty("Accept-Encoding", "gzip,deflate");
           con.setRequestProperty("Accept-Language", "zh-CN");
           con.setRequestProperty("Cache-Control", "no-cache");
//           con.setRequestProperty("uptype", "client");

           String fileType = getFileType(uploadFile);

           String newName = getFileName(uploadFile);
           String content_disposition = "Content-Disposition: form-data; " +
                   "name=\"upfile\"; filename=\"" +
                   newName +".text" +"\"" + end;
           String content_type = "Content-Type: text/plain"+end;

           String content_length = ""+ getFileLength(uploadFile.getAbsolutePath()) + content_disposition.getBytes().length+ content_type.getBytes().length;

//           con.setRequestProperty("Content-Length", content_length);

//           con.setRequestProperty("Cookie", cookie);
           /* 设置DataOutputStream */
           DataOutputStream ds = new DataOutputStream(con.getOutputStream());

           ds.writeBytes(twoHyphens + boundary + end);//-------


           ds.writeBytes(content_disposition);
//           LogUtils.e(content_disposition);

           ds.writeBytes(content_type);
           ds.writeBytes(end);
           //---- 内容 -----

           /* 取得文件的FileInputStream */
           FileInputStream fStream = new FileInputStream(uploadFile);
           /* 设置每次写入1024bytes */
           int bufferSize = 1024;
           byte[] buffer = new byte[bufferSize];

           int length = -1;
           /* 从文件读取数据至缓冲区 */
           while((length = fStream.read(buffer)) != -1)
           {
               /* 将资料写入DataOutputStream中 */
               ds.write(buffer, 0, length);
           }
           //----- 结束标记--
           ds.writeBytes(end);
           ds.writeBytes(twoHyphens + boundary+"--" + end);

           /* close streams */
           fStream.close();
           ds.flush();

           /* 取得Response内容 */
//        String responseMessage = con.getResponseMessage();
           InputStream is = con.getInputStream();
           StringBuffer b =new StringBuffer();
           java.io.BufferedReader breader = new BufferedReader(new InputStreamReader(is , "gbk"));
           String str = null;
           while((str= breader.readLine()) != null){
//               LogUtil.e("-----"+str);
               b.append(str);
//           str = breader.readLine();
           }
           Object content = con.getContent();
           /* 将Response显示于Dialog */
           LogUtil.e("上传成功");
//        showDialog("上传成功",context);
           /* 关闭DataOutputStream */
           ds.close();
           String strFromServer = b.toString().trim();

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