📄 cookietrackservlet.java
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/*
* CookieTrackServlet.java
*
* Created on 2007年10月16日, 上午11:12
*/
package com.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CookieTrackServlet extends HttpServlet {
/** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Cookie cookie=null;
//获取请求相关的Cookie
Cookie[] cookies=request.getCookies();
//判断Cookie VisitTimes是否存在,如果存在，其值加1
if(cookies!=null){
boolean flag=false;
for(int i=0; (i<cookies.length)&&(!flag); i++){
if(cookies[i].getName().equals("VisitTimes")){
String v=cookies[i].getValue();
int value=Integer.parseInt(v)+1;
cookies[i].setValue(Integer.toString(value));
response.addCookie(cookies[i]);
flag=true;
cookie=cookies[i];
}//end if
}//end for
}//end if
//不存在，创建cookie
if(cookie==null){
int maxAge=-1;
//create the cookie object
cookie=new Cookie("VisitTimes","1");
cookie.setPath(request.getContextPath());
cookie.setMaxAge(maxAge);
response.addCookie(cookie);
}//end if
//显示信息
response.setContentType("text/html; charset=utf-8");
PrintWriter out= response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Cookie跟踪会话</title>");
out.println("</head>");
out.println("<body>");
out.println("<h2>您好！</h2>");
out.println("欢迎您第"+cookie.getValue()+"次访问本页面<br>");
out.println("</body>");
out.println("</html>");
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/** Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/** Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/** Returns a short description of the servlet.
*/
public String getServletInfo() {
return "Short description";
}
// </editor-fold>
}
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