JavaWeb_使用Cookie模拟实现自动登录

JavaWeb_使用Cookie模拟实现自动登录_第1张图片
其中包含两个jsp文件,分别为login.jsp和index.jsp
代码如下:
login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录界面</title>
</head>
<body>
    <form action="index.jsp" method="post">
        用户名:<input type="text" name="name"/>
        <input type="submit" value="提交"/>
    </form>
</body>
</html>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>欢迎您</title>
</head>
<body>
    <% String name = request.getParameter("name"); if(name != null && !name.trim().equals("")){ Cookie cookie = new Cookie("name",name); cookie.setMaxAge(30); //设置cookie有效期为30s response.addCookie(cookie); }else{ Cookie[] cookies = request.getCookies(); if(cookies != null && cookies.length > 0){ for(Cookie cookie:cookies){ String cookieName = cookie.getName(); if("name".equals(cookieName)){ String val = cookie.getValue(); name = val; } } } } if(name != null && !name.trim().equals("")){ out.print("hello: " + name); }else{//否则重定向到登录界面 response.sendRedirect("login.jsp"); } %>
</body>
</html>

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