jsp技術

第一：Cookie的使用

屬性：設置Cookie的生命週期

package com.taxue.cookie;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 
 * http://127.0.0.1:8080/jsp/cookiedem01
 * cookie 使用
 * @author wqk
 *
 */
public class CookieDem01 extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		 
		Cookie[] cookies = request.getCookies();
		Cookie getCookie = null;
		if(cookies!= null){
			for (Cookie cookie:cookies) {
				if("lastTime".equals(cookie.getName())){
					getCookie = cookie ;
				}
			}
		}
		if(getCookie == null){
			response.getWriter().write("您是第一次訪問本網站!");
		}else{
			Long lastTime = Long.parseLong(getCookie.getValue());
			response.getWriter().write("您上次訪問時間是:"+new Date(lastTime));
		}
		Date date = new Date();
		Cookie cooke = new Cookie("lastTime", date.getTime()+"");
		response.addCookie(cooke);
		System.out.println("end");
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	}

}