GROOVY 类拦截器

class HelloWorld {
    String hello(name)
    {
       println "hello,$name"
    }
}

class SampleInterceptor implements Interceptor{
    Object beforeInvoke(Object object, String methodName, Object[] arguments)
    {
       if(methodName == 'hello')
       {
           println "object: $object"
           println "method name: $methodName"
           println "method arguments: $arguments"
       }
       object
    }

    boolean doInvoke(){ true } //whether or not to invoke the intercepted

    Object afterInvoke(Object object, String methodName, Object[] arguments,  Object result){
       if(methodName == 'hello')
        result="23";
           result
    }
}


  def proxy= ProxyMetaClass.getInstance( HelloWorld );   
    proxy.interceptor= new SampleInterceptor();
           proxy.use{     
           def helloworld= new HelloWorld()
          println helloworld.hello('world')
    }