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"%>

<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"%>

<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>

你可能感兴趣的:(JavaWeb基础)