使用httpHttpURLConnection上传多张图片和文字的方法

 

  String end = "\r\n";
  String twoHyphens = "--";
  String boundary = "*****";

  // 定义最后数据分隔线
  byte[] end_data = ("\r\n--" + boundary + "--\r\n").getBytes();

  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);
   /* 设置DataOutputStream */
   DataOutputStream out = new DataOutputStream(con.getOutputStream());

   StringBuffer params = new StringBuffer();
   /*** <-----------------0--------------------> *****/

   // username参数 用户名
   params.append(twoHyphens + boundary + end);
   params.append("Content-Disposition: form-data; name=\"username\"\r\n\r\n");
   params.append(configEntity.uname);
   params.append("\r\n");

   out.write(params.toString().getBytes());// 向服务器发送数据

   int leng = imageLists.size();//List imageLists;所有图片的集合
   for (int i = 0; i < leng; i++) {//遍历出所有的图片
    String fname = imageLists.get(i);
    File file = new File(fname);

    StringBuilder sb = new StringBuilder();
    sb.append(twoHyphens);
    sb.append(boundary);
    sb.append(end);
    sb.append("Content-Disposition: form-data;name=\"img[]\";filename=\""
      + file.getName() + "\"\r\n");
    // 这里不能漏掉，根据文件类型来来做处理，由于上传的是图片，所以这里可以写成image/pjpeg
    sb.append("Content-Type:image/pjpeg\r\n\r\n");
    out.write(sb.toString().getBytes());

    DataInputStream in = new DataInputStream(new FileInputStream(
      file));
    int bytes = 0;
    byte[] bufferOut = new byte[1024];
    while ((bytes = in.read(bufferOut)) != -1) {
     out.write(bufferOut, 0, bytes);
    }
    out.write("\r\n".getBytes());
    in.close();
   }
   out.write(end_data);// 向服务器发送数据
   out.flush();
   out.close();

   // 定义BufferedReader输入流来读取URL的响应
   BufferedReader reader = new BufferedReader(new InputStreamReader(
     con.getInputStream()));
   String line = null;
   while ((line = reader.readLine()) != null) {

    if (line.matches("topic_ok")) {

     handler.sendEmptyMessage(2);
    } else {
     handler.sendEmptyMessage(3);
    }
   }
  } catch (Exception e) {

   handler.sendEmptyMessage(9);
   e.printStackTrace();
  }