servlet session(1)
package com.bjsxt;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;import java.util.*;//Session追踪public class ShowSession extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out = response.getWriter();String title = "Session Tracking Example";HttpSession session = request.getSession(true);String heading;// Use getAttribute instead of getValue in version 2.2.Integer accessCount = (Integer) session.getAttribute("accessCount");if (accessCount == null) {accessCount = new Integer(0);heading = "Welcome, Newcomer";} else {heading = "Welcome Back";accessCount = new Integer(accessCount.intValue() + 1);}// Use setAttribute instead of putValue in version 2.2.session.setAttribute("accessCount", accessCount);out.println("<html><head><title>Session追踪</title></head>"+ "<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>");}/** Handle GET and POST requests identically. */public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}