JVM字节码增强

public interface BCInterface {
    void enhancement();
}

public class BCEnhancement implements BCInterface{

    public void enhancement() {
        System.out.println("hello enhancement");
    }
    
}

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class LogProxy implements InvocationHandler {

    private Object object;

    public Object getProxyObject(Object o){
        object=o;
        try{
            return Proxy.newProxyInstance(this.getClass().getClassLoader(),o.getClass().getInterfaces(),this);
        }catch (IllegalArgumentException e){
            throw new RuntimeException(e);
        }

    }
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("before invoke ...");
        Object result= method.invoke(object,args);
        System.out.println("after invoke ...");
        return result;
    }

}

public class Test {

    public static void main(String[] args) {
        LogProxy logProxy = new LogProxy();
        System.setProperty("sun.misc.ProxyGenerator.saveGeneratedFiles", "true");
        BCInterface byteCodeEn = (BCInterface) logProxy.getProxyObject(new BCEnhancement());
        byteCodeEn.enhancement();

    }

}

before invoke ...
hello enhancement
after invoke ...