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();