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A PreResultListener can affect an action invocation between the interceptor/action phase and the result phase. Typical uses include switching to a different Result or somehow modifying the Result or Action objects before the Result executes.

Examples

A PreResultListener can be added by an Action or an Interceptor.

By an Action

  public class MyAction extends ActionSupport {
     ...
     public String execute() throws Exception {
         ActionInvocation invocation = ActionContext.getContext().getActionInvocation();
         invocation.addPreResultListener(new PreResultListener() {
              public void beforeResult(ActionInvocation invocation, 
                                       String resultCode) {
                  // perform operation necessary before Result execution
              }
         });
     }
     ...
  }

By an Interceptor

  public class MyInterceptor extends AbstractInterceptor {
     ...
      public String intercept(ActionInvocation invocation) throws Exception {
         invocation.addPreResultListener(new PreResultListener() {
              public void beforeResult(ActionInvocation invocation, 
                                       String resultCode) {
                  // perform operation necessary before Result execution
              }
         });
      }
     ...
  }

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