如何使用java代码读取错误的响应信息呢？

实现思路:
   只需通过ResponseCode代码获取其错误代码
   当错误代码为指定值，则返回相应的响应消息

HttpURLConnection httpConn = (HttpURLConnection)_urlConnection;
InputStream _is;
if (httpConn.getResponseCode() < HttpURLConnection.HTTP_BAD_REQUEST) {
    _is = httpConn.getInputStream();
} else {
     /* 获取错误的响应信息 */
    _is = httpConn.getErrorStream();
}