Spring总结七：AOP动态代理的实现

/**
 * 商品操作接口
 */
public interface ProductService {
    public void add();
    public void edit();
    public void delte();
    public void select();
}

/**
 * 实现类
 */
public class ProductServiceImpl implements ProductService {
    @Override
    public void add() {
        System.out.println("添加商品");
    }

    @Override
    public void edit() {
        System.out.println("修改商品");
    }

    @Override
    public void delte() {
        System.out.println("删除商品");
    }

    @Override
    public void select() {
        System.out.println("查询商品");
    }
}

public class JdkProxy implements InvocationHandler {

    //被代理的目标
    private Object target;

    //构造函数 传入目标对象
    public JdkProxy(Object target) {
        this.target = target;
    }

    //提供创建代理对象的方法
    public Object createProxy() {
        return Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), this);
    }

    /**
     * 实现InvocationHandler接口的回调方法, 拦截目标对象所有方法都会执行invoke方法
     */
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("我是代理,我对被代理的目标有绝对的控制权...");
        Object returnVal = method.invoke(target, args);
        System.out.println("--------------------------------------");
        return returnVal;
    }
}

public class JdkProxyTest {
    @Test
    public void testJdkProxy() {
        //创建对象
        ProductService target = new ProductServiceImpl();
        //创建代理对象
        JdkProxy jdkProxy = new JdkProxy(target);
        //代理面向接口
        ProductService proxy = (ProductService) jdkProxy.createProxy();
        //通过代理调用方法
        proxy.add();
        proxy.edit();
        proxy.delte();
        proxy.select();
    }
}