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

 
  Place your content here

  here is index jsp
    get header info
  a.jsp
 

 ------------------------------

 
  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{%>
  正当访问
  <%}%>