input
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>用户登录</title>
</head>
<body>
<form name="form1" method="post" action="control.jsp">
<table align="center">
<tr>
<td>
用户名:<input type="text" name="userName" />
密码：<input type="password" name="pwd" />
<input type="submit" value="登录" />
</td>
</tr>
</table>
</form>
</body>
</html>
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control
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>登录处理页面</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String name = request.getParameter("userName");
String pwd = request.getParameter("pwd");
if(name.trim().equals("chaoyi") && pwd.trim().equals("123456")){
request.getRequestDispatcher("welcome.jsp").forward(request,response);
}else{
out.print("<script>alert('登录失败');history.back()</script>");
}
%>
</body>
</html>
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welcome
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>欢迎</title>
</head>
<body>
欢迎您：<%=request.getParameter("userName")%>
</body>
</html>
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效果图：
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