Cookie使用示例：获取上次访问时间示例,和记住用户名和密码的示例

Cookie：获取上次访问时间的servlet

package com.web.servlet;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

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

/**
* Cookie：获取上次访问时间
* @title CookieServlet.java
*/
@WebServlet("/cookie")
public class CookieServlet extends HttpServlet {
private static final long serialVersionUID = -5633460440471261682L;

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-ddHH:mm:ss");

// 1、获取Cookie对象
Cookie[] cookies = request.getCookies();
if (cookies != null) {
for (Cookie cookie : cookies) {
// 2、获取Cookie的名称
String name = cookie.getName();
// 3、判断是否是指定的cookie
if ("mydate".equals(name)) {
String value = cookie.getValue();
System.out.println("上次访问时间为：" + value);

response.getWriter().print(value);

// 把新的时间写出
cookie.setValue(sdf.format(new Date()));

response.addCookie(cookie);
}
}
} else {
// 注意：Cookie的值不能有空格
Cookie cookie = new Cookie("mydate", sdf.format(new Date()));
cookie.setMaxAge(60*60); // 1分钟
response.addCookie(cookie);
}

}
}

记住用户名和密码的servlet

package com.web.servlet;

import java.io.IOException;

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

/**
* 记住用户名
* @title LoginServlet.java
*/
@WebServlet("/login")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = -7217213344249352985L;

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 设置编码
request.setCharacterEncoding("utf-8");

// 接收参数
String name = request.getParameter("name");
String password = request.getParameter("password");
String rememberme = request.getParameter("rememberme");

// 判断是否勾选记住用户名
if (rememberme != null) {
// 如果勾选，则添加cookie
Cookie cookie = new Cookie("hpeu", name);
cookie.setMaxAge(60*60*5); // 5分钟
response.addCookie(cookie);
} else {
// 如果没有勾选，则删除cookie
Cookie[] cookies = request.getCookies();
if (cookies != null) {
for (Cookie cookie : cookies) {
String cn = cookie.getName();
if ("hpeu".equals(cn)) {
cookie.setMaxAge(0); // 删除cookie
response.addCookie(cookie);
}
}
}
}

System.out.println(name);
System.out.println(password);
System.out.println(rememberme);

}
}

• 点赞
• 收藏
• 分享
• 文章举报