参考：https://blog.csdn.net/qq_41301333/article/details/131202057
一、纯JSP方式实现用户登录功能
（一）实现思路
登录页面login.jsp，输入用户名和密码后，跳转到登录处理页面doLogin.jsp进行业务逻辑处理，登录成功，跳转到登录成功页面success.jsp，否则跳转到登录失败页面failure.jsp。
（二）实现步骤
<%--
Created by IntelliJ IDEA.
User: liu
Date: 2024/3/28
Time: 20:08
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
<style>
.a{
border-style: solid ;
border-color: purple;
width: 30%;
height: 40%;
margin: auto;
/*position: absolute;*/
/*left: 0;*/
/*top: 0;*/
/*bottom: 0;*/
/*right: 0;*/
background-color: lightgrey;
}
.b{
text-align: center ;
background-repeat: no-repeat ;
background-position:center center;
background-size:cover;
background-attachment: fixed;
}
</style>
</head>
<body background="./image/beijing.jpg" class='b'>
<form action="doLogin.jsp" method="post">
<table border="1" cellpadding="10" style="margin: 0px auto">
<tr>
<td align="center">账号</td>
<td><input type="text" name="username"/></td>
</tr>
<tr>
<td align="center">密码</td>
<td><input type="password" name="password"/></td>
</tr>
<tr align="center">
<td colspan="2">
<input type="submit" value="登录"/>
<input type="reset" value="重置"/>
</td>
</tr>
</table>
</form>
</body>
</html>
View Code
<%--
Created by IntelliJ IDEA.
User: liu
Date: 2024/3/28
Time: 20:07
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>用户登录</title>
</head>
<body>
<%
// 获取登录表单数据
String username = request.getParameter("username");
String password = request.getParameter("password");
// 判断登录是否成功
if (username.equals("无心剑") && password.equals("903213")) {
// 跳转到登录成功页面，传递用户名
response.sendRedirect("success.jsp?username=" + username);
} else {
// 跳转到登录失败页面，传递用户名
response.sendRedirect("failure.jsp?username=" + username);
}
%>
</body>
</html>
View Code
<%--
Created by IntelliJ IDEA.
User: liu
Date: 2024/3/28
Time: 20:07
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>用户登录</title>
</head>
<body>
<h3 style="text-align: center">用户登录</h3>
<form action="doLogin.jsp" method="post">
<table border="1" cellpadding="10" style="margin: 0px auto">
<tr>
<td align="center">账号</td>
<td><input type="text" name="username"/></td>
</tr>
<tr>
<td align="center">密码</td>
<td><input type="password" name="password"/></td>
</tr>
<tr align="center">
<td colspan="2">
<input type="submit" value="登录"/>
<input type="reset" value="重置"/>
</td>
</tr>
</table>
</form>
</body>
</html>
login.jsp
<%--
Created by IntelliJ IDEA.
User: liu
Date: 2024/3/28
Time: 20:08
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录成功</title>
</head>
<body>
<h3 style="text-align: center">恭喜，<%=request.getParameter("username")%>，登录成功！</h3>
</body>
</html>
View Code
<%@ page import="java.util.Date" %><%--
Created by IntelliJ IDEA.
User: liu
Date: 2024/3/28
Time: 20:08
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录失败</title>
</head>
<body>
<h3 style="text-align: center">抱歉，<%=request.getParameter("username")%>，登录失败！</h3>
<%
// 打印当前日期和时间
System.out.println(request.getParameter("username"));
%>
</body>
</html>
View Code
标签：Code,模块,登录,新写,jsp,background,页面,View From： https://www.cnblogs.com/vactor/p/18102765