java：Cookie（常用操作），Cookie和Session免登录实例

1.常用操作：

package cn.zzsxt.lee.web.cookie;

import java.io.IOException;

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 GetCookieServlet extends HttpServlet {

    @Override

    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        // 获取cookie信息

        Cookie[] cookies = req.getCookies();

        for (int i = 0; i < cookies.length; i++) {

            System.out.println(cookies[i].getName() + ":" + cookies[i].getValue());

        }

    }

}

package cn.zzsxt.lee.web.cookie;

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;

/**

 * @description

 *

 * cookie:

 *         在服务器被创建，返回给客户端，并且保存客户端

 *         如果设置了SETMAXAGE(int seconds)，会把cookie保存在客户端的硬盘中

 *         如果没有设置，会默认把cookie保存在浏览器的内存中

 *        一旦设置setPath()：只能通过设置的路径才能获取到当前的cookie信息

 * @author Seven Lee

 * @date

 *

 */

@WebServlet("/cookie.sxt")

public class CookieServlet extends HttpServlet {

    @Override

    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        // 创建cookie对象

        Cookie compCookie = new Cookie("computer", "HP");

        // 服务器把cookie响应给客户端，所有的cookie对象，都会在服务器端创建，通过http响应给客户端(浏览器)

        Cookie keyCookie = new Cookie("key", "doubleflybird");

        Cookie mouseCookie = new Cookie("mouse", "leishe");

        mouseCookie.setMaxAge(60*60*24*30);//如果不设置使用时间，那么将取不到Cookie的值

        System.out.println(req.getContextPath());// 项目名(在tomcat中部署的项目名)

        // /zzsxt/shopping.jsp

        keyCookie.setPath(req.getContextPath()+"/getCookie.sxt");// 一旦设置了cookie的路径，就只能通过这一个路径才能获取到cookie信息

        resp.addCookie(compCookie);

        resp.addCookie(mouseCookie);

        resp.addCookie(keyCookie);

    }

}

2.Cookie和Session登录实例：

　　注册：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'register.jsp' starting page</title>

<script type="text/javascript" src="js/jquery-3.2.1.min.js"></script>

<script type="text/javascript">

    var sexFlag = false;

    var untFlag = false;

    function checkSex() {

        var sex = $(":checked").val();

        if (sex != null) {

            // 验证成功

            alert(111);

            sexFlag = true;

        } else {

            // 验证失败

            alert(222);

            sexFlag = false;

        }

    }

    function checkUniversity() {

        var unt = $(":selected").val();

        if (unt != 0 && unt != null) {

            // 验证成功

            untFlag = true;

        } else {

            untFlag = false;

        }

    }

    $(function() {

        $("form").submit(function() {

            checkSex();

            checkUniversity();

            return sexFlag && untFlag;

        });

    });

</script>

</head>

<body>

    <h1>注册页面</h1>

    <form action="register.sxt" method="post">

        用户名：

        <input type="text" name="username" id="uname" />

        密码：

        <input type="password" name="pwd" id="pawd" />

        性别：

        <input class="sexes" type="radio" name="sex" value="male" />

        男

        <input class="sexes" type="radio" name="sex" value="female" />

        女 院校：<select name="unt">

            <option value="0">请选择院校</option>

            <option value="zzsxt">天津大学</option>

            <option value="bjsxt">北京大学</option>

        </select>

        <input type="submit" value="提交" />

    </form>

</body>

</html>

　　注册处理：

package cn.zzsxt.lee.web.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import cn.zzsxt.lee.web.dao.IUserDao;

import cn.zzsxt.lee.web.dao.impl.UserDaoImpl;

import cn.zzsxt.lee.web.entity.User;

import cn.zzsxt.lee.web.utils.BASE64;

import cn.zzsxt.lee.web.utils.MD5;

import cn.zzsxt.lee.web.utils.UUIDUtils;

@WebServlet("/register.sxt")

public class RegisterServlet extends HttpServlet {

    private IUserDao userDao = new UserDaoImpl();

    @Override

    protected void service(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");

        response.setCharacterEncoding("utf-8");

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

        String username = request.getParameter("username");

        String pwd = request.getParameter("pwd");

        String sex = request.getParameterValues("sex")[0];

        String university = request.getParameterValues("unt")[0];

        User user = new User();

        user.setId(UUIDUtils.getUUid());

        user.setUsername(username);

        user.setRealPassword(pwd);

        pwd = MD5.getMD5(pwd);

        user.setPassword(pwd);

        user.setSex(sex);

        user.setUniversity(university);

        user.setAuthority(0);

        int result = 0;

        try {

            result = userDao.registerUser(user);

        } catch (Exception e) {

            e.printStackTrace();

        }

        if (result > 0) {

            response.sendRedirect("login.jsp");

            return;

        }

    }

}

　　登录之前必须先判断获取Cookie：

package cn.zzsxt.lee.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;

import cn.zzsxt.lee.web.utils.MD5;

@WebServlet("/checkLogin2.sxt")

public class CheckLogin2 extends HttpServlet {

    @Override

    protected void service(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        String username = "";

        String password = "";

        // 1.获取cookie的值

        Cookie[] cookies = request.getCookies();

        // 2.判断cookie数组是否为null

        if (cookies != null) {

            // 3.判断cookie中是否有用户名和密码

            for (int i = 0; i < cookies.length; i++) {

                if ("uname".equals(cookies[i].getName())) {

                    // 4.如果cookie中有用户名和密码，就获取

                    username = cookies[i].getValue();

                }

                if ("pwd".equals(cookies[i].getName())) {

                    password = cookies[i].getValue();

                }

            }

        }

        request.getSession().setAttribute("name", username);

        request.getSession().setAttribute("pwd", password);

        response.sendRedirect("login.jsp");

        return;

    }

}

　　登录：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'login.jsp' starting page</title>

</head>

<body>

    <form action="login.sxt" method="post">

        用户名:

        <input type="text" name="username" value="${name }" />

        密码:

        <input type="password" name="pwd" value="${pwd }" />

        <input type="submit" value="提交" />

    </form>

</body>

</html>

　　登录处理：

package cn.zzsxt.lee.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;

import cn.zzsxt.lee.web.dao.IUserDao;

import cn.zzsxt.lee.web.dao.impl.UserDaoImpl;

import cn.zzsxt.lee.web.entity.User;

import cn.zzsxt.lee.web.utils.MD5;

@WebServlet("/login.sxt")

public class LoginServlet extends HttpServlet {

    private IUserDao userDao = new UserDaoImpl();

    @Override

    protected void service(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");

        response.setCharacterEncoding("utf-8");

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

        String username = request.getParameter("username");

        String pwd = request.getParameter("pwd");

        pwd = MD5.getMD5(pwd);

        User user = new User();

        user.setUsername(username);

        user.setPassword(pwd);

        try {

            User u = userDao.selectUserByUsernameAndPassword(user);

            if (u.getId() != null && !"".equals(u.getId())) {

                // 登录成功

                // 存入session

                request.getSession().setAttribute("user", u);

                Cookie usernameCookie = new Cookie("uname", u.getUsername());

                Cookie pwdCookie = new Cookie("pwd", u.getRealPassword());

                usernameCookie.setMaxAge(60 * 60 * 24);

                pwdCookie.setMaxAge(60 * 60 * 24);

                response.addCookie(usernameCookie);

                response.addCookie(pwdCookie);

                response.sendRedirect("index.jsp");

            } else {

                // 登录失败

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

　　frameset框架主页：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'index.jsp' starting page</title>

</head>

<frameset rows="100,*">

    <frame src="top.jsp" name="top" />

    <frameset cols="200,*">

        <frame src="left.jsp" name="left" />

        <frame src="right.jsp" name="right" />

    </frameset>

</frameset>

</html>

　　 Filter内Cookie的设置：

package cn.zzsxt.lee.web.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * @description 编码过滤器

 * @author Seven Lee

 * @date 2017年7月28日下午4:48:59

 *

 */

public class GlobalFilter implements Filter {

    @Override

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain)

            throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;

        HttpServletResponse response = (HttpServletResponse) servletResponse;

        request.setCharacterEncoding("UTF-8");

        response.setCharacterEncoding("UTF-8");

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

        // 如果是设置编码，就必须添加chain.doFilter();

       // chain.doFilter(request, response);  //放这里有BUG，登录的时候第一次不会出现账号密码，刷新一次才会出现

        // 获取cookie数组

        Cookie[] cookies = request.getCookies();

        if (cookies != null) {// 防止空指针

            String username = "";

            String password = "";

            for (int i = 0; i < cookies.length; i++) {

                System.out.println(cookies[i].getValue());

                if ("username".equals(cookies[i].getName())) {

                    username = cookies[i].getValue();

                }

                if ("password".equals(cookies[i].getName())) {

                    password = cookies[i].getValue();

                }

            }

            request.getSession().setAttribute("username", username);

            request.getSession().setAttribute("password", password);
　　　　　　　　chain.doFilter(request, response); //放最后没BUG

        } else {

            for(int i = 0; i < cookies.length; i++){

                System.out.println(cookies[i].getValue());

            }

            response.sendRedirect("login.jsp");

            return;

        }

    }

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override

    public void destroy() {

    }

}

　　Top处登录成功：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'top.jsp' starting page</title>

<script type="text/javascript">

    function trunLogin() {

        window.top.location.href = "login.jsp";

    }

</script>

</head>

<body>

    <c:choose>

        <c:when test="${sessionScope.user.username != null }">  //指的是登录时user对象的属性

            <h1>欢迎:${sessionScope.user.username }</h1>

            <a href="">注销</a>

        </c:when>

        <c:when test="${sessionScope.username != null }"> //指的是当前Cookie的属性

            <h1>欢迎:${sessionScope.username }</h1>

            <a href="">注销</a>

        </c:when>

        <c:otherwise>

            <a href="javascript:void(0);" onclick="trunLogin();">请登录</a>

        </c:otherwise>

    </c:choose>

</body>

</html>

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