ShowSession（39）

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firefly_shine

最新推荐文章于 2023-03-31 11:08:48 发布

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本文介绍了一个简单的Session追踪示例，通过Java Servlet实现每次访问时计数器加一，并展示了如何获取及设置Session值，同时提供了Session信息的显示方法。

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Title:ShowSession
discription:1、实现每访问一次数字加一 2、获取session的值 3、设置session名值对 4、日期的展示方式
@Copyright:
@Company:
@autor:firefly
@version:1.0
@time:2012.12.30

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
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");
  //拿到名字为accessCount的属性的值
  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);
  //在session里面放入名字叫做accessCount，值叫做accessCount的名值对，session里面的名字永远都是String.

  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>");
  //new Date(session.getCreationTime(),将Long类型展现为日期类型。

}

/** Handle GET and POST requests identically. */

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}