📄 index.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=GB2312">
<title>index</title>
</head>
<body>
<%
if(session.getAttribute("username") == null){
%>
<jsp:forward page="login.html"/>
<%
}else{
response.sendRedirect("Dologin.jsp");
}
%>
</body>
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