Java编程

开发平台：
Java

SessionExample.java：源码内容
							/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 466607 2006-10-21 23:09:50Z markt $
 *
 */
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import util.HTMLFilter;
/**
 * Example servlet showing request headers
 *
 * @author James Duncan Davidson <duncan@eng.sun.com>
 */
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("<br>");
        out.println(rb.getString("sessions.created") + " ");
        out.println(new Date(session.getCreationTime()) + "<br>");
        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("<P>");
        out.println(rb.getString("sessions.data") + "<br>");
        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) + "<br>");
        }
        out.println("<P>");
        out.print("<form action="");
	out.print(response.encodeURL("SessionExample"));
        out.print("" ");
        out.println("method=POST>");
        out.println(rb.getString("sessions.dataname"));
        out.println("<input type=text size=20 name=dataname>");
        out.println("<br>");
        out.println(rb.getString("sessions.datavalue"));
        out.println("<input type=text size=20 name=datavalue>");
        out.println("<br>");
        out.println("<input type=submit>");
        out.println("</form>");
        out.println("<P>GET based form:<br>");
        out.print("<form action="");
	out.print(response.encodeURL("SessionExample"));
        out.print("" ");
        out.println("method=GET>");
        out.println(rb.getString("sessions.dataname"));
        out.println("<input type=text size=20 name=dataname>");
        out.println("<br>");
        out.println(rb.getString("sessions.datavalue"));
        out.println("<input type=text size=20 name=datavalue>");
        out.println("<br>");
        out.println("<input type=submit>");
        out.println("</form>");
        out.print("<p><a href="");
	out.print(response.encodeURL("SessionExample?dataname=foo&datavalue=bar"));
	out.println("" >URL encoded </a>");
	
        out.println("</body>");
        out.println("</html>");
        
        out.println("</body>");
        out.println("</html>");
    }
    public void doPost(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {
        doGet(request, response);
    }
}

						