strut2 拦截器能获得action执行后的结果吗

public class ViewInterceptor extends AbstractInterceptor{  
     public String intercept(ActionInvocation invocation) throws Exception {  
    String s = invocation.invoke();  
          Object action = invocation.getInvocationContext().get("action");  
         System.out.println("action---"+action.getClass());  
         if(action instanceof StudentRegisterListAction){  
             StudentRegisterListAction sa = (StudentRegisterListAction)action;  
             System.out.println(sa.getIdCard());  
             System.out.println(sa.getUserName());  
         }  
         Field[] fields = action.getClass().getDeclaredFields();  
         Method[] methods = action.getClass().getMethods();  
         for(Field field: fields){  
             Class c = field.getType();  
             System.out.println("字段类型--------"+c.getName());  
             System.out.println("字段名称--------"+field.getName());  
             if(field.isAccessible()){  
                 System.out.println(field.get(action));  
             }else{  
                 String methodName = "get"+field.getName().substring(0, 1).toUpperCase()+field.getName().substring(1,field.getName().length());  
                 System.out.println(methodName);  
                 for(Method m: methods){  
                //   System.out.println("方法名---"+m.getName());  
                     if(m.getName().equals(methodName)){  
                         System.out.println("字段值-----"+m.invoke(action, null));  
                     }  
                 }  
             }  
              
          
         }  
        return s;  
}  
}