Cglib--动态代理

一、SayHello

/**
 * 被代理类，使用cglib可以不必实现接口
 */
public class SayHello {

    public void say() {
        System.out.println("success");
    }
}

二、Cglib

import org.springframework.cglib.proxy.Enhancer;
import org.springframework.cglib.proxy.MethodInterceptor;
import org.springframework.cglib.proxy.MethodProxy;

import java.lang.reflect.Method;

public class Cglib implements MethodInterceptor {

    private Enhancer enhancer = new Enhancer();

    public Object getProxy(Class clazz){
        // 设置需要创建子类的类
        enhancer.setSuperclass(clazz);
        enhancer.setCallback(this);
        // 通过字节码技术动态创建子类实例
        return enhancer.create();
    }

    @Override
    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
        System.out.println("前置代理");
        // 通过代理类调用父类的方法
        Object invoke = methodProxy.invokeSuper(o, objects);
        System.out.println("后置代理");
        return invoke;
    }
}

三、ProxyTest

public class ProxyTest {

    public static void main(String[] args) {
        Cglib cglib = new Cglib();
        SayHello sayHello = (SayHello) cglib.getProxy(SayHello.class);
        sayHello.say();
    }
}