cookie实现自动登录功能
2022-09-17 20:02:30 # javaweb # cookie #code #javaweb #cookie

使用cookie实现用户自动登录功能

login.jsp

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<%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2022/9/17
  Time: 20:12
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        .main {
            padding-top: 20px;
            margin: 60px auto;
            width: 18%;
            height: 210px;
            border-radius: 5%;
        }
        .man {
            width: 100%;
            height: 100px;
        }
        .man .top,
        .down {
            position: relative;
            width: 100%;
            height: 30%;
        }
        .main .top .l,
        .down .l {
            position: absolute;
            left: 20px;
        }
        .main .top .r,
        .down .r {
            position: absolute;
            right: 10px;
        }
        .main .down {
            margin-top: 15px;
        }
        .mess {
            width: 100%;
            height: 50px;
            text-align: center;
        }
        .mess .top {
            width: 100%;
            height: 50%;
        }
        .mess .down {
            margin-top: 0;
            width: 100%;
            height: 50%;
        }
        .submit {
            margin-top: 20px;
            text-align: center;
        }
        .submit button {
            margin: auto;
            display: inline-block;
            width: 100px;
            height: 30px;
        }
    </style>
</head>
<body>
<%--    如果cookie存在并且存储着用户的登录信息，则直接登录跳转页面--%>
    <%
        Cookie c[] = request.getCookies();
        if(c!=null){
            for(int i=0;i<c.length;i++){
                if(c[i].getName().equals("user")){
                    String user = c[i].getValue();
                    session.setAttribute("user",user);
                    response.sendRedirect("zy.jsp");
                    return;
                }
            }
        }
    %>
    <form action="dealLogin.jsp" method="post" class="main">
        <div class="man">
            <div class="top">
                <div class="l">用户名</div>
                <div class="r"><input type="text" name="user"></div>
            </div>
            <div class="down">
                <div class="l">密码</div>
                <div class="r"><input type="password" name="passwd"></div>
            </div>
        </div>
        <div class="mess">
            <div class="top">
                不保存用户名
                <input type="radio" name="timer" value="0">
            </div>
            <div class="down">
                <input type="radio" name="timer" value="5">5秒
                <input type="radio" name="timer" value="10">10秒
                <input type="radio" name="timer" value="20">20秒
            </div>
        </div>
        <div class="submit">
            <button type="submit">提交</button>
        </div>
    </form>
</body>
</html>

dealLogin.jsp

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<%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2022/9/17
  Time: 20:48
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <%
        request.setCharacterEncoding("UTF-8");
        String user = request.getParameter("user");
        String passwd = request.getParameter("passwd");
        if(user.equals("kittates")&&passwd.equals("kittates")&&user!=null&&passwd!=null){
            session.setAttribute("user",user);
            session.setAttribute("passwd",passwd);
            String timer = request.getParameter("timer");
            if(timer!=null){
                int num = Integer.parseInt(timer);
                Cookie c = new Cookie("user",user);
                c.setMaxAge(num);
                response.addCookie(c);
//                if(num>0){
//                    Cookie c = new Cookie("user",user);
//                    c.setMaxAge(num);
//                    response.addCookie(c);
//                }
            }
            response.sendRedirect("zy.jsp");
        }
        else {
            response.sendRedirect("login_cookie.jsp");
        }
    %>
</body>
</html>

zy.jsp

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<%--
  Created by IntelliJ IDEA.
  User: DELL
  Date: 2022/9/17
  Time: 20:58
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <%
        String user = (String)session.getAttribute("user");
        if(user!=null){
            out.println("<h3>welcome </h3>"+user);
        }
        else {
            response.sendRedirect("login.jsp");
        }
    %>
</body>
</html>

总结

很带劲😢

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