如何通过Spring AOP更改返回值 [英] How to change the return value by spring aop

问题描述

我在DAO层有一个具有返回值的方法，我想通过spring AOP更改返回值，根据不同的要求，然后发送到SERVICE层中的相应方法；但是我不知道该怎么做.

I have a method with a return value in DAO layer, I want to change the return value by spring AOP, according different requirement,s and then send to corresponding method in SERVICE layer; but i don't know how to do so.

推荐答案

您可以将@Around方面应用于应修改其返回类型的方法.您可以查看我的博客文章介绍如何将Spring AOP方面添加到Spring应用程序，然后编写一个@Around方面.我将此方面用于方法的Memoizing结果，但是对于您而言，您将采用ProceedingJoinPoint.proceed()的返回值，将其类型转换为适当的类，然后对其进行修改并返回.

You can apply an @Around aspect to the method whose return type should be modified. You can take a look at my blog post on how to add Spring AOP facet to a Spring application, then write an @Around aspect. I used this aspect for Memoizing results of a method, but in your case, you would take the return value of ProceedingJoinPoint.proceed(), typecast it to appropriate class, then modify it and return it.

如果您打算完全返回一个完全不同的对象，则将导致ClassCastException，除非实际返回的对象是返回类型的子类.

In case you plan to return a completely different object altogether, then that would result in ClassCastException, unless the actual returned object is a subclass of the return type.

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