THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Overwrite destroy to release resources on application shutdown.
Thread Safety
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Interceptors must be thread-safe! A Struts 2 Action instance is created for every request and do not need to be thread-safe. Conversely, Interceptors are shared between requests and must be thread-safe. |
AbstractInterceptor
The AbstractInterceptor class provides an empty implementation of init and destroy, and can be used if these methods are not going to be implemented.
Mapping
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Interceptors are declared using the interceptor element, nested inside the interceptors element. Example from struts-default.xml:
| Code Block | ||||
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<struts>
...
<package name="struts-default">
<interceptors>
<interceptor name="alias" class="com.opensymphony.xwork2.interceptor.AliasInterceptor"/>
<interceptor name="autowiring" class="com.opensymphony.xwork2.spring.interceptor.ActionAutowiringInterceptor"/>
...
</interceptors>
</package>
...
</struts>
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Example
Assuming there is an action of type "MyAction", with a setDate(Date) method, this simple interceptor will set the date of the action to the current date:
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import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
public class SimpleInterceptor extends AbstractInterceptor {
public String intercept(ActionInvocation invocation) throws Exception {
MyAction action = (MyAction)invocation.getAction();
action.setDate(new Date());
return invocation.invoke();
}
}
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