Get URL Last Modified
/**********************************************************************************
Feedzeo!
A free and open source RSS/Atom/RDF feed aggregator
Copyright (C) 2005-2006 Anand Rao (anandrao@users.sourceforge.net)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
************************************************************************************/
/*
* HttpUtil.java
*
* Created on November 12, 2005, 9:12 PM
*/
import java.util.*;
import java.net.*;
/**
*
* @author Anand Rao
*/
public class HttpUtil {
public static boolean hasURLContentChanged(String url, long fromtime)
{
URL Url; HttpURLConnection httpconn=null; long modtime;
boolean contentChanged=false;
try {
Url = new URL(url);
httpconn = (HttpURLConnection) Url.openConnection();
modtime = httpconn.getLastModified();
if ((modtime > fromtime) || (modtime <= 0)) {
System.out.println("*** Old Link time:"+new Date(fromtime).toString()+
" New link time:"+new Date(modtime).toString());
contentChanged=true;
}
}
catch (Exception e) {
contentChanged=true; // assume content has changed
}
if (httpconn != null)
httpconn.disconnect();
return contentChanged;
}
public static long getURLLastModified(String url)
{
URL Url; HttpURLConnection httpconn=null; long modtime;
try {
Url = new URL(url);
httpconn = (HttpURLConnection) Url.openConnection();
modtime = httpconn.getLastModified();
}
catch (Exception e) {
modtime = -1;
}
if (httpconn != null)
httpconn.disconnect();
System.out.println("URL:"+url+" LastModified:" +
new Date(modtime).toString());
return modtime;
}
public static String getDomainName(String url)
{
URL u;
try {
u = new URL(url);
}
catch (Exception e) {
return "";
}
return u.getHost();
}
}
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