<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!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=gb2312">
<title>无标题文档</title>
</head><body>
<p>
<%
session.setAttribute("test","ok");
%>
</p>
<p> </p>
<p><a href="b.jsp">这个链接肯定有效</a><br/>
</p>
<p> </p>
<p><a href="b.jsp" target="_blank">这个链接肯定无效</a></p><%
out.println("<br/>"+session.getAttribute("test"));
%>
</body>
</html>a.jsp
<!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=gb2312">
<title>无标题文档</title>
</head><body>
<p>
<%
session.setAttribute("test","ok");
%>
</p>
<p> </p>
<p><a href="b.jsp">这个链接肯定有效</a><br/>
</p>
<p> </p>
<p><a href="b.jsp" target="_blank">这个链接肯定无效</a></p><%
out.println("<br/>"+session.getAttribute("test"));
%>
</body>
</html>a.jsp
<!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=gb2312">
<title>无标题文档</title>
</head><body>
<%
String test=(String)session.getAttribute("test");
if (test!=null)
{
out.print("取到了");
out.println(test);
}
else
{
out.print("取不到了");
out.println(test);
}
%>
</body>
</html>
b.jsp