业务描述
用户在login.jsp页面输入用户名密码登录：
如果用户名为xingoo，密码为123，则跳转到成功界面login_success.jsp，并显示用户登录的名字；
如果用户名密码错误，则跳转到失败界面login_failure.jsp，并提示返回登录界面。
login.jsp代码
<%@ 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>用户登录</title>
</head>
<body>
<h1>用户登录</h1>
<hr>
<form name="regForm" action="doLogin.jsp" method="post">
<table>
<tr>
<td>username</td>
<td><input type="text" name="username"/></td>
</tr>
<tr>
<td>password</td>
<td><input type="password" name="password"/></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="submit"/></td>
</tr>
</table>
</form>
</body>
</html>
dologin.jsp处理代码
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%
String username = "";
String password = "";
request.setCharacterEncoding("utf-8");
username = request.getParameter("username");
password = request.getParameter("password");
if("xingoo".equals(username)&&"123".equals(password)){
session.setAttribute("loginUser",username);
request.getRequestDispatcher("login_success.jsp").forward(request,response);
}else{
response.sendRedirect("login_failure.jsp");
}
%>
login_success.jsp用户登录成功界面
<%@ 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>用户登录</title>
</head>
<body>
<h1>用户登录</h1>
<hr>
欢迎您!<%=session.getAttribute("loginUser") %>
</body>
</html>
login_failure.jsp用户登录失败界面
<%@ 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>用户登录</title>
</head>
<body>
<h1>用户登录</h1>
<hr>
登录失败!<a href="login.jsp">返回登录</a>
</body>
</html>
时间： 2024-08-05 07:09:34