How to define a global page when requested page or method is not found?

问题

I know how to fine a global error redirect page in our defined package when exception encountered that just by adding the following configuration in the parent package in struts.xml:

<global-results>
    <result name="error">/error.jsp</result>
</global-results>

<global-exception-mappings>
    <exception-mapping exception="java.lang.Exception" result="error" />
</global-exception-mappings>

But It seems to not able to catch those exceptions like requested resources, methods, pages are not found, I mean how to catch the struts2-level errors, and then I can do something to handle it.

回答1:

You should define your unknown handler in the struts.xml. Unknown handlers are called by the framework, when an unknown action, result, or method are executed.

<bean type="com.opensymphony.xwork2.UnknownHandler" name="handler" class="com.package.SomeUnknownHandler"/> 

The class should implement UknownHandler interface to handle the cases:

• when an action configuration is unknown
• when a result cannot be found for an action and result code
• when an action method cannot be found

回答2:

Here some detaiks a how you can use the UknownHandler (https://stackoverflow.com/a/27881698/3383543), enjoy.

来源：https://stackoverflow.com/questions/18503977/how-to-define-a-global-page-when-requested-page-or-method-is-not-found