Servlet Session Example

/*
* Copyright 2004 The Apache Software Foundation
*
* 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.
*/
/* $Id: SessionExample.java,v 1.4 2004/03/18 16:40:33 jfarcand Exp $
*
*/

import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

/**
* Example servlet showing request headers
*
* @author James Duncan Davidson
*/

public class SessionExample extends HttpServlet {

ResourceBundle rb = ResourceBundle.getBundle(”LocalStrings”);

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
response.setContentType(”text/html”);

PrintWriter out = response.getWriter();
out.println(” < html > “);
out.println(” < body bgcolor=\"white\" > “);
out.println(”< head >“);

String title = rb.getString(”sessions.title”);
out.println(” < title > ” + title + “< /title >“);
out.println(” < / head > “);
out.println(” < / body > “);

// img stuff not req’d for source code html showing
// relative links everywhere!

// XXX
// making these absolute till we work out the
// addition of a PathInfo issue

out.println(”< a href=\"../sessions.html\" >“);
out.println(” < img src=" ../images/code.gif\" height=24 "
+ "width=24 align=right border=0 alt=\"view code\ " > < / a >“);
out.println(”< a href=\"../index.html\" >“);
out.println(”< img src=\"../images/return.gif\" height=24 "
+ "width=24 align=right border=0 alt=\"return\" >< / a >“);

out.println(”< h3 >” + title + “< / h3 > “);

HttpSession session = request.getSession(true);
out.println(rb.getString(”sessions.id”) + ” ” + session.getId());
out.println(”
“);
out.println(rb.getString(”sessions.created”) + ” “);
out.println(new Date(session.getCreationTime()) + “
“);
out.println(rb.getString(”sessions.lastaccessed”) + ” “);
out.println(new Date(session.getLastAccessedTime()));

String dataName = request.getParameter(”dataname”);
String dataValue = request.getParameter(”datavalue”);
if (dataName != null && dataValue != null) {
session.setAttribute(dataName, dataValue);
}

out.println(”

“);
out.println(rb.getString(”sessions.data”) + “
“);
Enumeration names = session.getAttributeNames();
while (names.hasMoreElements()) {
String name = (String) names.nextElement();
String value = session.getAttribute(name).toString();
out.println(HTMLFilter.filter(name) + ” = ”
+ HTMLFilter.filter(value) + “
“);
}

out.println(”

“);