Prevent same action called twice as long as user i

问题:

I am using Struts2 framework, my problem is

If user log-in into system and clicked some action lets say ACTION1, flow will go to action class and executes some method, return appropriate result. He may visit some of the web pages, and again clicked ACTION1.

As long as he is in the same session, now the control should not go that particular method but the result should be same as previous results.

How can we achieve this?

回答1:

You can try a tokenSession interceptor.

This interceptor builds off of the Token Interceptor, providing advanced logic for handling invalid tokens. Unlike the normal token interceptor, this interceptor will attempt to provide intelligent fail-over in the event of multiple requests using the same session. That is, it will block subsequent requests until the first request is complete, and then instead of returning the invalid.token code, it will attempt to display the same response that the original, valid action invocation would have displayed if no multiple requests were submitted in the first place.

It will prevent from double submit the same action or reuse the same token that you provide with s:token tag.

Description

Stop double-submission of forms.

The token tag is used to help with the "double click" submission problem. It is needed if you are using the TokenInterceptor or the TokenSessionInterceptor. The s:token tag merely places a hidden element that contains the unique token.

Place the tag inside your form and you never get back in submitting the same form twice. Token session interceptor will try to handle invalid token for you by returning the same response like in first case.