Proxy静态代理与动态代理

静态代理->装饰器模式

jdk动态代理

运行的时候动态生成代理类
被代理类必须实现接口

cglib

/**
 * CGLIB实现动态代理不需要接口，底层是asm
 */
public class Main {
    public static void main(String[] args) {
        Enhancer enhancer = new Enhancer();
        enhancer.setSuperclass(Tank.class);
        enhancer.setCallback(new TimeMethodInterceptor());
        Tank tank = (Tank)enhancer.create();
        tank.move();
    }
}
class TimeMethodInterceptor implements MethodInterceptor {
    @Override
    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
        System.out.println(o.getClass().getSuperclass().getName());
        System.out.println("before");
        Object result = null;
        result = methodProxy.invokeSuper(o, objects);
        System.out.println("after");
        return result;
    }
}
class Tank {
    public void move() {
        System.out.println("Tank moving claclacla...");
        try {
            Thread.sleep(new Random().nextInt(10000));
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

asm

修改class二进制码