问题
I'd like to interpose between class methods to dynamically extends an object.
I already know about the java.lang.reflect.Proxy stuff, but it's way too limited to do real interposing.
From Using java.lang.reflect.Proxy to Interpose on Java Class Methods, the first limitation is :
(...) the method must be called through an instance of the proxy class. So nested methods calls, for instance, would not be intercepted.
And the worst one :
(...) the method must have been defined in an Interface that is implemented by the object being proxied. It can not be called through an instance of a class that does not implement an interface.
The object I'd like to extends at run-time doesn't implement any interface, and worst, the methods I need to override are nested and private.
I know this is fairly easy in Python & C, and the article cited above says that it could be possible :
The next article in this series will illustrate some techniques for overcoming these limitations.
Unfortunately, I'm unable to find this article.
回答1:
Try using CGLIB:
Here is a tutorial I wrote a couple of years ago, its quite simple introduction to CGLIB: CGLIB intro
If you need even more power, consider to use AspectJ
Hope this helps
来源：https://stackoverflow.com/questions/9061478/interposing-on-java-class-methods-without-interfaces