Bug修复问题

采用下面的代码，访问网页：http://www.weather.com.cn/data/cityinfo/101010100.html，想读取下图中红框中的内容，但是抛出了IOException，通过各种测试介意确定现在的异常发生在程序中标黄色的地方，也就是reader.readLine()这一句，为什么？？

读取网页的代码：

 public class HttpUtil {

     public static void sendHttpRequest(final String address,
             final HttpCallBackListener listener) {
         new Thread(new Runnable(){
             @Override
             public void run() {
                 HttpURLConnection connection = null ;
                 try {
                     URL url = new URL(address) ;
                     connection = (HttpURLConnection) url.openConnection() ;
                     connection.setRequestMethod("GET");
                     connection.setConnectTimeout(10000);
                     connection.setReadTimeout(10000);
                     InputStream in = connection.getInputStream() ;
                     BufferedReader reader  = new BufferedReader(new InputStreamReader(in)) ;
                     StringBuilder response = new StringBuilder() ;
                     String line ;

                     while((line = reader.readLine()) != null){
                         response.append(line) ;
                     }
                     if(listener != null){
                         //回调onFinish()方法
                         listener.onFinish(response.toString());
                     }
                 } catch (Exception e) {
                     if(listener != null){
                         listener.onError(e);
                     }
                 }finally{
                     if(connection != null){
                         connection.disconnect();
                     }
                 }
             }
         }).start() ;
     }

 }