index.jsp -----------------------------
<html>
<head><title>Simple jsp page</title></head>
<body>Place your content here
here is index jsp
get header info
<a href="a.jsp">a.jsp</a>
</body>
</html>
------------------------------
a.jsp页面
通过判断 referer， 判断你从哪里来。
<html>
<head><title>Simple jsp page</title></head>
<body>Place your content here
here is a. jsp
get header info
<%=request.getHeader("Referer")%>
<%if(null == request.getHeader("Referer") || request.getHeader("Referer").indexOf("yourdomain.com") < 0)标签(>
做人要厚道
<)错误，请检查标签代码。else标签(>
合法访问
<)错误，请检查标签代码。%>
</body>
</html>
