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() ;
    }
    

}