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Jetty example source code file (DefaultHandler.java)

This example Jetty source code file (DefaultHandler.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Jetty tags/keywords

bytearrayiso8859writer, contexthandler, contexthandler, defaulthandler, defaulthandler, found, http, io, ioexception, network, not, not, request, request, response, servlet, servletexception, string, string, title

The Jetty DefaultHandler.java source code

// ========================================================================
// Copyright 1999-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at 
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================

package org.mortbay.jetty.handler;

import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.mortbay.jetty.Handler;
import org.mortbay.jetty.HttpConnection;
import org.mortbay.jetty.HttpHeaders;
import org.mortbay.jetty.HttpMethods;
import org.mortbay.jetty.MimeTypes;
import org.mortbay.jetty.Request;
import org.mortbay.jetty.Server;
import org.mortbay.log.Log;
import org.mortbay.util.ByteArrayISO8859Writer;
import org.mortbay.util.IO;
import org.mortbay.util.StringUtil;


/* ------------------------------------------------------------ */
/** Default Handler.
 * 
 * This handle will deal with unhandled requests in the server.
 * For requests for favicon.ico, the Jetty icon is served. 
 * For reqests to '/' a 404 with a list of known contexts is served.
 * For all other requests a normal 404 is served.
 * TODO Implement OPTIONS and TRACE methods for the server.
 * 
 * @author Greg Wilkins (gregw)
 * @org.apache.xbean.XBean
 */
public class DefaultHandler extends AbstractHandler
{
    long _faviconModified=(System.currentTimeMillis()/1000)*1000;
    byte[] _favicon;
    boolean _serveIcon=true;
    
    public DefaultHandler()
    {
        try
        {
            URL fav = this.getClass().getClassLoader().getResource("org/mortbay/jetty/favicon.ico");
            if (fav!=null)
            _favicon=IO.readBytes(fav.openStream());
        }
        catch(Exception e)
        {
            Log.warn(e);
        }
    }
    
    /* ------------------------------------------------------------ */
    /* 
     * @see org.mortbay.jetty.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int)
     */
    public void handle(String target, HttpServletRequest request, HttpServletResponse response, int dispatch) throws IOException, ServletException
    {      
        Request base_request = request instanceof Request?(Request)request:HttpConnection.getCurrentConnection().getRequest();
        
        if (response.isCommitted() || base_request.isHandled())
            return;
        base_request.setHandled(true);
        
        String method=request.getMethod();

        // little cheat for common request
        if (_serveIcon && _favicon!=null && method.equals(HttpMethods.GET) && request.getRequestURI().equals("/favicon.ico"))
        {
            if (request.getDateHeader(HttpHeaders.IF_MODIFIED_SINCE)==_faviconModified)
                response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
            else
            {
                response.setStatus(HttpServletResponse.SC_OK);
                response.setContentType("image/x-icon");
                response.setContentLength(_favicon.length);
                response.setDateHeader(HttpHeaders.LAST_MODIFIED, _faviconModified);
                response.getOutputStream().write(_favicon);
            }
            return;
        }
        
        
        if (!method.equals(HttpMethods.GET) || !request.getRequestURI().equals("/"))
        {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;   
        }

        response.setStatus(HttpServletResponse.SC_NOT_FOUND);
        response.setContentType(MimeTypes.TEXT_HTML);
        
        ByteArrayISO8859Writer writer = new ByteArrayISO8859Writer(1500);

        String uri=request.getRequestURI();
        uri=StringUtil.replace(uri,"<","<");
        uri=StringUtil.replace(uri,">",">");
        
        writer.write("<HTML>\n\nError 404 - Not Found");
        writer.write("</TITLE>\n<BODY>\n<H2>Error 404 - Not Found.</H2>\n");
        writer.write("No context on this server matched or handled this request.<BR>");
        writer.write("Contexts known to this server are: <ul>");


        Server server = getServer();
        Handler[] handlers = server==null?null:server.getChildHandlersByClass(ContextHandler.class);
 
        for (int i=0;handlers!=null && i<handlers.length;i++)
        {
            ContextHandler context = (ContextHandler)handlers[i];
            if (context.isRunning())
            {
                writer.write("<li><a href=\"");
                if (context.getVirtualHosts()!=null && context.getVirtualHosts().length>0)
                    writer.write("http://"+context.getVirtualHosts()[0]+":"+request.getLocalPort());
                writer.write(context.getContextPath());
                if (context.getContextPath().length()>1 && context.getContextPath().endsWith("/"))
                    writer.write("/");
                writer.write("\">");
                writer.write(context.getContextPath());
                if (context.getVirtualHosts()!=null && context.getVirtualHosts().length>0)
                    writer.write(" @ "+context.getVirtualHosts()[0]+":"+request.getLocalPort());
                writer.write(" ---> ");
                writer.write(context.toString());
                writer.write("</a></li>\n");
            }
            else
            {
                writer.write("<li>");
                writer.write(context.getContextPath());
                if (context.getVirtualHosts()!=null && context.getVirtualHosts().length>0)
                    writer.write(" @ "+context.getVirtualHosts()[0]+":"+request.getLocalPort());
                writer.write(" ---> ");
                writer.write(context.toString());
                if (context.isFailed())
                    writer.write(" [failed]");
                if (context.isStopped())
                    writer.write(" [stopped]");
                writer.write("</li>\n");
            }
        }
        
        for (int i=0;i<10;i++)
            writer.write("\n<!-- Padding for IE                  -->");
        
        writer.write("\n</BODY>\n</HTML>\n");
        writer.flush();
        response.setContentLength(writer.size());
        OutputStream out=response.getOutputStream();
        writer.writeTo(out);
        out.close();
        
        return;
    }

    /* ------------------------------------------------------------ */
    /**
     * @return Returns true if the handle can server the jetty favicon.ico
     */
    public boolean getServeIcon()
    {
        return _serveIcon;
    }

    /* ------------------------------------------------------------ */
    /**
     * @param serveIcon true if the handle can server the jetty favicon.ico
     */
    public void setServeIcon(boolean serveIcon)
    {
        _serveIcon = serveIcon;
    }


}
</pre>
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