Jetty example source code file (SessionDump.java)

This example Jetty source code file (SessionDump.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

action, action, http, httpservletresponse, io, ioexception, name, remove, request, response, servlet, servletexception, servletexception, session, session, set, string, string, util, value

The Jetty SessionDump.java source code

// ========================================================================
// Copyright 1996-2005 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 com.acme;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.Enumeration;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


/* ------------------------------------------------------------ */
/** Test Servlet Sessions.
 *
 * @author Greg Wilkins (gregw)
 */
public class SessionDump extends HttpServlet
{

    int redirectCount=0;
    /* ------------------------------------------------------------ */
    String pageType;

    /* ------------------------------------------------------------ */
    public void init(ServletConfig config)
         throws ServletException
    {
        super.init(config);        
    }

    /* ------------------------------------------------------------ */
    protected void handleForm(HttpServletRequest request,
                          HttpServletResponse response) 
    {
        HttpSession session = request.getSession(false);
        String action = request.getParameter("Action");
        String name =  request.getParameter("Name");
        String value =  request.getParameter("Value");

        if (action!=null)
        {
            if(action.equals("New Session"))
            {   
                session = request.getSession(true);
                session.setAttribute("test","value");
            }
            else if (session!=null)
            {
                if (action.equals("Invalidate"))
                    session.invalidate();
                else if (action.equals("Set") && name!=null && name.length()>0)
                    session.setAttribute(name,value);
                else if (action.equals("Remove"))
                    session.removeAttribute(name);
            }       
        }
    }
    
    /* ------------------------------------------------------------ */
    public void doPost(HttpServletRequest request,
                       HttpServletResponse response) 
        throws ServletException, IOException
    {
        handleForm(request,response);
        String nextUrl = getURI(request)+"?R="+redirectCount++;
        String encodedUrl=response.encodeRedirectURL(nextUrl);
        response.sendRedirect(encodedUrl);
    }
        
    /* ------------------------------------------------------------ */
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response) 
        throws ServletException, IOException
    {
        handleForm(request,response);
        
        response.setContentType("text/html");

        HttpSession session = request.getSession(getURI(request).indexOf("new")>0);
        try
        {
            if (session!=null) 
                session.isNew();
        }
        catch(IllegalStateException e)
        {
            session=null;
        }
        
        PrintWriter out = response.getWriter();
        out.println("<h1>Session Dump Servlet:"); 
        out.println("<form action=\""+response.encodeURL(getURI(request))+"\" method=\"post\">");       
        
        if (session==null)
        {
            out.println("<H3>No Session");
            out.println("<input type=\"submit\" name=\"Action\" value=\"New Session\"/>");
        }
        else
        {
            try
            {  
                out.println("<b>ID: "+session.getId()+"
");
                out.println("<b>New: "+session.isNew()+"
");
                out.println("<b>Created: "+new Date(session.getCreationTime())+"
");
                out.println("<b>Last: "+new Date(session.getLastAccessedTime())+"
");
                out.println("<b>Max Inactive: "+session.getMaxInactiveInterval()+"
");
                out.println("<b>Context: "+session.getServletContext()+"
");
                
              
                Enumeration keys=session.getAttributeNames();
                while(keys.hasMoreElements())
                {
                    String name=(String)keys.nextElement();
                    String value=""+session.getAttribute(name);

                    out.println("<b>"+name+": "+value+"
");
                }

                out.println("<b>Name:
");
                out.println("<b>Value:
");

                out.println("<input type=\"submit\" name=\"Action\" value=\"Set\"/>");
                out.println("<input type=\"submit\" name=\"Action\" value=\"Remove\"/>");
                out.println("<input type=\"submit\" name=\"Action\" value=\"Invalidate\"/>
");
                
                out.println("</form>
");
                
                if (request.isRequestedSessionIdFromCookie())
                    out.println("<P>Turn off cookies in your browser to try url encoding
");
                
                if (request.isRequestedSessionIdFromURL())
                    out.println("<P>Turn on cookies in your browser to try cookie encoding
");
                out.println("<a href=\""+response.encodeURL(request.getRequestURI()+"?q=0")+"\">Encoded Link
");
                
            }
            catch (IllegalStateException e)
            {
                e.printStackTrace();
            }
        }

    }

    /* ------------------------------------------------------------ */
    public String getServletInfo() {
        return "Session Dump Servlet";
    }

    /* ------------------------------------------------------------ */
    private String getURI(HttpServletRequest request)
    {
        String uri=(String)request.getAttribute("javax.servlet.forward.request_uri");
        if (uri==null)
            uri=request.getRequestURI();
        return uri;
    }
    
}