javaWeb 使用cookie显示上次访问网站时间

Posted 2020-08-14

package de.bvb.cookie;

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

import javax.enterprise.inject.ResolutionException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.swing.text.DateFormatter;

/**
 * 显示上次访问时间
 * 
 * @author joker
 * 
 */
public class CookieDemo1 extends HttpServlet {

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

        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html; charset=UTF-8");

        PrintWriter out = response.getWriter();
        out.write("您上次访问的时间是: ");

        // 获取上次访问时间
        Cookie[] cookies = request.getCookies();
        for (int i = 0; cookies != null && i < cookies.length; i++) {
            if (cookies[i].getName().equals("lastAccessTime")) {
                Long cookieValue = Long.parseLong(cookies[i].getValue());
                out.write(new Date(cookieValue).toLocaleString());
            }
        }

        // 保存本次访问时间
        Cookie cookie = new Cookie("lastAccessTime", System.currentTimeMillis()
                + "");
        response.addCookie(cookie);

    }

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

        doGet(request, response);
    }

}