index.jsp

-----------------------------

Place your content here

here is index jsp
get header info
a.jsp

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a.jsp頁面
通過判斷 referer， 判斷你從哪里來。

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){%>
做人要厚道
<%}else{%>
合法訪問
<%}%>