java - 创建方面，从方法中检索对象并返回另一个对象

Question

我正在尝试编写一个方面(在 Spring 中)，它从我的包中的方法获取输入参数，进行一些操作并向该方法返回结果。

这可能吗？

例如:

public MyClass {

 Public void execute (Object object)
  {
     //doSomeLogic with the returned object from the aspect
  }
}

@Aspect
public class ExecutionAspect {




@Before(// any idea?)
        public void getArgument(JoinPoint joinPoint) {


         Object[] signatureArgs = joinPoint.getArgs();
         for (Object signatureArg: signatureArgs) {
             MyObject myObject=(MyObject)signatureArg;
             //do some manipulation on myObject
}
                  //Now how do I return the object to the intercepted method?


    }

谢谢，射线。

Answer 1

如果您想更改返回值，则必须使用@Around建议。

@Aspect
public class AroundExample {

  @Around("some.pointcut()")
  public Object doSomeStuff(ProceedingJoinPoint pjp) throws Throwable {

    Object[] args = joinPoint.getArgs(); // change the args if you want to
    Object retVal = pjp.proceed(args); // run the actual method (or don't)
    return retVal; // return the return value (or something else)
  }

}

该机制的描述如下:Spring Reference > AOP > Around Advice