cglib接口代理

直接贴代码：

先定义一个接口：

package example.proxy;

public interface Animal {
    String say();

    String food();
}

再来个实现类：

package example.proxy;

public class Dog implements Animal{
    @Override
    public String say() {
        System.out.println("汪");
        return "汪";
    }

    @Override
    public String food() {
        System.out.println("骨头");
        return "骨头";
    }
}

测试，jdk动态代理和cglib代理对比：

package example.proxy;

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

import java.lang.reflect.Proxy;

public class ProxyMain {
    public static void main(String[] args) {
        cglibProxy();
    }

    public static void cglibProxy() {
        Dog dog = new Dog();
        Enhancer enhancer = new Enhancer();
//        enhancer.setSuperclass(Dog.class);
        enhancer.setInterfaces(new Class[]{Animal.class}); //注意这里需要设置代理的接口class数组
        enhancer.setCallback((MethodInterceptor) (o, method, objects, methodProxy) -> {
            System.out.println("start");
            Object invoke = methodProxy.invoke(dog, objects);
            System.out.println("end");
            return invoke;
        });
//        enhancer.setUseCache(false);
        Animal o = (Animal) enhancer.create();
        o.food();
    }
    public static void jdkProxy() {
        Dog dog = new Dog();
        Animal instance = (Animal) Proxy.newProxyInstance(Dog.class.getClassLoader(), Dog.class.getInterfaces(), (proxy, method, args1) -> {
            System.out.println("start");
            Object invoke = method.invoke(dog, args1);
            System.out.println("end");
            return invoke;
        });
        instance.food();
        instance.say();
    }
}

执行结果：

start
骨头
end

总结：其实cglib可jdk的动态代理很类似，最终都是通过被代理类执行原始方法，只是jdk使用的是反射，cglib使用的fastcalss机制。