JSP显示会话信息实例学习

package hall;

import Java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
import java.util.*;

public class ShowSession extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession(true);
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Searching the Web";
String heading;
Integer accessCount = new Integer(0);;
if (session.isNew()) {
heading = "Welcome, Newcomer";
} else {
heading = "Welcome Back";
Integer oldAccessCount =
// 在Servlet API 2.2中使用getAttribute而不是getValue
(Integer)session.getValue("accessCount");
if (oldAccessCount != null) {
accessCount =
new Integer(oldAccessCount.intValue() + 1);
}
}
// 在Servlet API 2.2中使用putAttribute
session.putValue("accessCount", accessCount);

out.println(ServletUtilities.headWithTitle(title) +
"＜BODY BGCOLOR=＼"#FDF5E6＼"＞＼n" +
"＜H1 ALIGN=＼"CENTER＼"＞" + heading + "＜/H1＞＼n" +
"＜H2＞Information on Your Session:＜/H2＞＼n" +
"＜TABLE BORDER=1 ALIGN=CENTER＞＼n" +
"＜TR BGCOLOR=＼"#FFAD00＼"＞＼n" +
" ＜TH＞Info Type＜TH＞Value＼n" +
"＜TR＞＼n" +
" ＜TD＞ID＼n" +
" ＜TD＞" + session.getId() + "＼n" +
"＜TR＞＼n" +
" ＜TD＞Creation Time＼n" +
" ＜TD＞" + new Date(session.getCreationTime()) + "＼n" +
"＜TR＞＼n" +
" ＜TD＞Time of Last Access＼n" +
" ＜TD＞" + new Date(session.getLastAccessedTime()) + "＼n" +
"＜TR＞＼n" +
" ＜TD＞Number of Previous Accesses＼n" +
" ＜TD＞" + accessCount + "＼n" +
"＜/TABLE＞＼n" +
"＜/BODY＞＜/HTML＞");
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}