java用post上传数据，便获取返回值,android.os.NetworkOnMainThreadException

 public static void sendPost(String url, Map<String, String> parameters) {

   StringBuffer param = new StringBuffer();

//        Log.e("test","BcakInfo  =  sendPost ");

        try {

            URL realUrl = new URL(url);

            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();

            conn.setRequestMethod("POST");

            conn.setDoOutput(true);

            conn.setDoInput(true);

            conn.setUseCaches(false);

            for (String key : parameters.keySet()) {
param.append("&");
String value =URLEncoder.encode(parameters.get(key),"utf-8");

//            Log.e("test","BcakInfo ... value ="+value);
param.append(key).append("=").append(value);
}

//            Log.e("test","BcakInfo ... param ="+param);

            conn.getOutputStream().write(param.toString().getBytes());

            conn.getOutputStream().flush();

            conn.getOutputStream().close();

//            Log.e("test","BcakInfo  =  close ");

            int reponsecode = conn.getResponseCode(); 

            if (HttpURLConnection.HTTP_OK==reponsecode){    

            // 处理响应流，必须与服务器响应流输出的编码一致   

            BufferedReader responseReader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));   

            String readLine = responseReader.readLine();

            Log.e("test","BcakInfo ...readLine==="+readLine); //这个就是返回值了

            }

        } catch (Exception e) {

            Log.e("test","BcakInfo。。发送 POST 请求出现异常！ = "+e);
        }

｝

//备注：android4.0意思可能会报
android.os.NetworkOnMainThreadException  错误，你只需要另建一个进程就可以解决了

例如：new Thread(new Runnable(){
           @Override
           public void run() {
sendPost(_url,paramMap);
           }
       }).start();