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。

 

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!");
    }    
}

 

 

拦截器:

?

1 2 3 4 5 6 7 8 9 10

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：

?

1 2 3 4 5 6 7

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();     } }

　

 

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

 

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

 

 

 

  

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。