title: Restrict direct url access in struts2
body: <p>I am developing business application by using struts2.
  I'd like to restrict direct url accessing.
  If the user is accessed an action by browser url direct access, not click the link,
  I'd like to show the error page.(You can't use url direct access.)</p>
  
  <p>If someone have the solution, please share to me.
  Thank you.</p>