设计模式-代理模式（spring中cglib）

1.代理模式

public interface RealMethod {

    void show();
}

public class Real implements RealMethod{

    @Override
    public void show() {
        System.out.println("show-----");
    }
}

public class Proxy implements RealMethod{

    public Real real = new Real();

    @Override
    public void show() {

        before();

        real.show();

        after();
    }

    private void after() {
        System.out.println("after-----");
    }

    private void before() {
        System.out.println("before----");
    }

    public static void main(String[] args) {
        Proxy proxy = new Proxy();  //spring改进了创建proxy的方式，不需要每个类都去写个它对应的proxy类
        proxy.show();
    }
}

2.spring中cglib

public class CglibProxySpringProxyFactory implements MethodInterceptor{

    <T>T createProxy(T t){
        Enhancer enhancer = new Enhancer();
        enhancer.setSuperclass(t.getClass());
        enhancer.setCallback(this);
        return (T)enhancer.create();
    }

    @Override
    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {

        before();

        Object res = methodProxy.invokeSuper(o, objects);

        after();
        return res;
    }

    private void after() {
        System.out.println("-----after");
    }

    private void before() {
        System.out.println("-----before");
    }

    public static void main(String[] args) {
        Real real = new Real();
        CglibProxySpringProxyFactory proxyFactory = new CglibProxySpringProxyFactory();
        Real proxy = proxyFactory.createProxy(real);
        proxy.show();
    }
}

todo。jdk的proxy和cglib的比较。 有错误请指正 todo动态代理具体写