尝试获取响应代码时代码挂起。

URL url=null;

try
{
    Thread.sleep(8000);
}
catch (InterruptedException e1)
{
    e1.printStackTrace();
}

try
{
    //urlToBeCrawled comes from the database
    url=new URL(urlToBeCrawled);
}
catch (MalformedURLException e)
{
    e.printStackTrace();
    //The code is in a loop,so the use of continue.I apologize for putting code in the catch block.
    continue;
}
HttpURLConnection huc=null;
try
{
    huc = (HttpURLConnection)url.openConnection();

}
catch (IOException e)
{
    e.printStackTrace();
}
try
{
   //Added the request property
    huc.addRequestProperty(\"User-Agent\", \"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)\");
    huc.setRequestMethod(\"HEAD\");

}
catch (ProtocolException e)
{
    e.printStackTrace();
}

huc.setConnectTimeout(1000);
try
{
    huc.connect();

}
catch (IOException e)
{

    e.printStackTrace();
    continue;
}

int responseCode=0;
try
{
    //Sets the read timeout
    huc.setReadTimeout(15000);
    //Code hangs here for some URL which is random in each run
    responseCode = huc.getResponseCode();

}
catch (IOException e)
{
    huc.disconnect();

    e.printStackTrace();
    continue;
}
if (responseCode!=200)
{
    huc.disconnect();
    continue;
}