Java深入分析动态代理

public class LogitechMouse implements Mouse{
    @Override
    public void sell() {
        System.out.println("出售罗技鼠标");
    }
}
public class HHKBKeyboard implements Keyboard{
    @Override
    public void sell() {
        System.out.println("出售HHKB键盘");
    }
}

public class MouseProxy implements Mouse {
    private Mouse mouse;

    public MouseProxy(Mouse mouse) {
        this.mouse = mouse;
    }
    @Override
    public void sell() {
        System.out.println("售前了解");
        mouse.sell();
        System.out.println("售后服务");
    }
}
public class KeyboardProxy implements Keyboard{
    private Keyboard keyboard;
    public KeyboardProxy(Keyboard keyboard) {
        this.keyboard = keyboard;
    }
    @Override
    public void sell() {
        System.out.println("售前了解");
        keyboard.sell();
        System.out.println("售后服务");
    }
}

public class Test {
    public static void main(String[] args) {
        Mouse logitechMouse = new LogitechMouse();
        MouseProxy mouseProxy = new MouseProxy(logitechMouse);
        mouseProxy.sell();
        Keyboard hhkbKeyboard = new HHKBKeyboard();
        KeyboardProxy keyboardProxy = new KeyboardProxy(hhkbKeyboard);
        keyboardProxy.sell();
    }
}

public class JDKProxy implements InvocationHandler {
    private Object object;
    public JDKProxy(Object object) {
        this.object = object;
    }
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("售前了解");
        Object invoke = method.invoke(object, args);
        System.out.println("售后服务");
        return invoke;
    }
}

public class Test {
    public static void main(String[] args) {
        Mouse logitechMouse = new LogitechMouse();
        JDKProxy jdkProxy = new JDKProxy(logitechMouse);
        Mouse mouse= (Mouse)Proxy.newProxyInstance(jdkProxy.getClass().getClassLoader(), new Class[]{Mouse.class}, jdkProxy);
        mouse.sell();
        HHKBKeyboard hhkbKeyboard = new HHKBKeyboard();
        JDKProxy jdkProxy1 = new JDKProxy(hhkbKeyboard);
        Keyboard keyboard = (Keyboard)Proxy.newProxyInstance(jdkProxy1.getClass().getClassLoader(), new Class[]{Keyboard.class}, jdkProxy1);
        keyboard.sell();
    }
}

public class CGLIBProcy implements MethodInterceptor {
    private Enhancer enhancer = new Enhancer();
    private Object object;
    public CGLIBProcy(Object object) {
        this.object = object;
    }
    public Object getProxy(){
        //设置需要创建子类的类
        enhancer.setSuperclass(object.getClass());
        enhancer.setCallback(this);
        //创建代理对象
        return enhancer.create();
    }
    // o: cglib 动态生成的代理类的实例
    // method:实体类所调用的都被代理的方法的引用
    // objects 参数列表
    // methodProxy:生成的代理类对方法的代理引用
    @Override
    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
        System.out.println("售前了解");
        Object invoke = method.invoke(object, objects);
        System.out.println("售后处理");
        return invoke;
    }
}

public class Test {
    public static void main(String[] args) {
        Mouse logitechMouse = new LogitechMouse();
        CGLIBProcy cglibProcy = new CGLIBProcy(logitechMouse);
        Mouse proxy = (Mouse)cglibProcy.getProxy();
        proxy.sell();
        cglibProcy = new CGLIBProcy(new HHKBKeyboard());
        Keyboard keyboard = (Keyboard)cglibProcy.getProxy();
        keyboard.sell();
    }
}