cglib调用过程

本篇文章不讲cglib如何应用，只从eclipse调试的角度看看从最外层的动态代理类调用到最内层的被代理类，经过了哪些中间步骤。

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废话不多说，直接上代码

被代理类:

public class MySubject {
    public void doSomeThing() {
        System.err.println("Do some thing!");
    }    
}

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拦截器:

public class CgLibMethodInterceptor implements MethodInterceptor {
	@Override
	public Object intercept(Object target,Method method,Object[] args,MethodProxy proxy) throws Throwable {
		System.err.println("before ");
		Object result = proxy.invokeSuper(target,args);
		System.err.println("after " + result);
		return result;
	}

}　

测试cglib动态代理：

public class CglibProxyWriter {
	public static void main(String[] args) {
		System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY,"D:cglib-class");
		MySubject subject= (MySubject) Enhancer.create(MySubject.class,new CgLibMethodInterceptor());		
		subject.doSomeThing();
	}
}

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从调用栈可以清晰的看到最外层到最内层的调用逻辑。

MySubject$$EnhancerByCGLIB$$24226c3c(MySubject).doSomeThing() line: 6
MySubject$$EnhancerByCGLIB$$24226c3c.CGLIB$doSomeThing$0() line: not available
MySubject$$EnhancerByCGLIB$$24226c3c$$FastClassByCGLIB$$a7941ac2.invoke(int,Object,Object[]) line: not available
MethodProxy.invokeSuper(Object,Object[]) line: 244
CgLibMethodInterceptor.intercept(Object,Method,Object[],MethodProxy) line: 14
MySubject$$EnhancerByCGLIB$$24226c3c.doSomeThing() line: not available
CglibProxyWriter.main(String[]) line: 16

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MySubject$$EnhancerByCGLIB$$24226c3c(MySubject).doSomeThing() line: 6

MySubject$$EnhancerByCGLIB$$24226c3c$$FastClassByCGLIB$$a7941ac2.invoke(int,Object[]) line: not available

MySubject$$EnhancerByCGLIB$$24226c3c.doSomeThing() line: not available

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eclipse调试的时候不能加上断点，cglib动态生成的代理类需要反编译工具查看，截图已经提供了反编译后的代码。