Android_请求网络数据

try {    //获取url    URL url = new URL("网络地址");    //请求网络    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();    int code = urlConnection.getResponseCode();    //判断是否返回成功    if(code==200){        //获取网络信息        InputStream inputStream = urlConnection.getInputStream();        BufferedReader bf = new BufferedReader(new InputStreamReader(inputStream));        builder = new StringBuilder();        String s = "";        //拼接        while((s=bf.readLine())!=null){            builder.append(s);        }    }} catch (Exception e) {    e.printStackTrace();}return builder.toString();