动态代理之JDK与CGLib

JDK:被代理类需实现接口

public interface Car {

    void run();
}

public class Audi implements Car {

    @Override
    public void run() {
        System.out.println("Audi run...");
    }
}

 public static void main(String[] args) {
        Audi audi = new Audi();

        Car car = (Car) Proxy.newProxyInstance(audi.getClass().getClassLoader(), new Class[]{Car.class}, new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                System.out.println("method"+method.getName()+"start...");
                Object object = method.invoke(audi,args);
                System.out.println("method"+method.getName()+"end...");
                return object;
            }
        });

        car.run();
    }

CGLib:被代理类不需要实现接口

package com.example.demo.proxy;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

import java.lang.reflect.Method;

public class CglibTest {

    public static void main(String[] args) {
        Enhancer enhancer = new Enhancer();
        enhancer.setSuperclass(Audi.class);
        enhancer.setCallback(new MyInterceptor());
        Audi audi = (Audi) enhancer.create();
        audi.run();
    }
}

class MyInterceptor implements MethodInterceptor {

    @Override
    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
        System.out.println("method"+method.getName()+"start...");
        Object result = null;
        result = methodProxy.invokeSuper(o,objects);
        System.out.println("method"+method.getName()+"end...");
        return result;
    }
}