Inherits the struts2 tag to control the display permissions of page elements.

The permission system is implemented through the struts2 Interceptor. There are too many examples on the Internet.

Only the control on whether a connection can be displayed on the page is recorded here.

Scenario: the user does not have the permission to perform the "Modify record" operation. Therefore, the "Modify record" link should not appear on the page.

Environment: the version of struts2.1.8 does not matter.

My actual environment: eclipse3.5 + JBoss tool + ejb3 + mysql5

Steps:

1. Create a TLD file under the WEB-INF, I named it here ems-tag.tld. The content is copied from the Struts-core.jar/meta-INF/directory

 
   
   
    
     
    
   
    " permission control UI tags "
    
   
     1.0 
    
   
     EMS  
    
     /ems2-tags 
     
     
      
       
      
     
       A 
      
     
       CN. vs9. EMS. web. tags. UI. anchortag 
      
     
       JSP 
      The following 
      Code  is skipped, exactly the same as struts2 .... 
     
   
  

2. inherit the tag class: org. Apache. struts2.views. jsp. UI. anchortag

 /**  Rewritten struts2 link label
* <EMS: A action = "$ {actionurl}"> link </EMS: A>
*
* Label: determines whether the "permission" is available before executing the URL to display the execution link on the page.
* "Permission" depends on whether the user group has the permission to execute this action
  */  
  Public     Class  Anchortag  Extends  Org. Apache. struts2.views. jsp. UI. anchortag {
  /**  
* Whether authorization is passed. No by default
 */  
  Private     Boolean  Isaccess  =     False  ;


@ Override
  Public     Int  Doendtag ()  Throws  Jspexception {
System. Out. println ( "  Doendtag  "  );
  If  (  !  Isaccess ){
  Return  Skip_body;
}
  Return     Super  . Doendtag ();
}


@ Override
  Public    Int  Dostarttag ()  Throws  Jspexception {
System. Out. println (  This  . Action );  //  Determine Based on URL

  //  Replace this with the specific permission judgment  
  Isaccess  =     True  ;


 If  (  !  Isaccess ){
  Return  Skip_body;
}
  Return     Super  . Dostarttag ();
}


} 

3. Try it on the page

Run now,Try to switch the isaccess in the label class=True | FalseSee the results

 Other labels can also be used.  .  
Currently, I have implemented a tag and action tag.  ,  The project is enough.
Ideas  :   
Pagination of pages into multiple views  .  
Pass  < EMS  :  Action name  =  "  User_list  "  Executeresult  =  "  True  "  Namespace  =  "  /JSON  "  /> Method  .  Dynamic combination of page Components 

 <%  @ Page Language  =  "  Java  "  Contenttype  =  "  Text/html; charsets = UTF-8  "  Pageencoding  =  " UTF-8  "  %>  
  <%  @ Taglib prefix  =  "  S  "  Uri  =  "  /Struts-tags  "     %>  
 <%  @ Taglib prefix  =  "  EMS  "  Uri  =  "  Ems2-tags  "     %>  

  <  EMS  :  A action =  "  /Data/user_update.action? Entity. ID = 1  "  >  Modify user  </  EMS  :  A  >