Spring AOP：访问参数名称 [英] Spring AOP: get access to argument names

问题描述

我正在使用Spring 3.x，Java 6.

I'm using Spring 3.x, Java 6.

我有一个带有以下连接点的@Around方面：

I have an @Around aspect with the following joinpoint:

@Around("execution(public * my.service.*.*Connector.*(..))")

所以，我基本上有兴趣拦截所有类公共方法的调用，类名以Connector结尾。到目前为止一直很好。

So, I'm basically interested in intercepting all calls to public methods of classes with the class name ending with "Connector". So far so good.

现在，在我的方面，我想访问方法的实际参数名称：

Now, in my aspect I would like to access the actual argument names of the methods:

public doStuff(String myarg, Long anotherArg)

myarg 和 anotherArg

我理解使用：

CodeSignature signature = (CodeSignature)jointPoint.getSignature();
return signature.getParameterNames();

实际上可以正常工作，但前提是我使用 -g flag（完全调试），我宁愿不这样做。

will actually work but only if I compile the code with the "-g" flag (full debug) and I would rather not do it.

是否有其他方法可以访问这种运行时信息。

Is there any other way to get access to that kind of runtime information.

谢谢
L

推荐答案

不幸的是你不能这样做： - （。这是众所周知的JVM /字节码限制 - 使用反射无法获取参数名称，因为它们并不总是存储在字节码中（与方法/类名相反）。

Unfortunately you can't do this :-(. It is a well known limitation of JVM/bytecode - argument names can't be obtained using reflection, as they are not always stored in bytecode (in the contrary to method/class names).

作为一种解决方法，几个框架/规范引入了对诸如 WebParam （ name property）或 PathParam 。

As a workaround several frameworks/specification introduce custom annotations over arguments like WebParam (name property) or PathParam.

目前你可以得到没有的东西符号是一组值。

For the time being all you can get without annotations is an array of values.

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