public interface IManager {

    void add(String item);

}

public class IManagerImpl implements IManager {

    private List<String> list = new ArrayList<>();

    @Override

    public void add(String item) {

        list.add(item);

    }

}

public interface Advice {

    void beforeAdvice();

    void afterAdvice();

}

public class AdviceImpl implements Advice {

    @Override

    public void beforeAdvice() {

        System.out.println("Method start time: " + System.currentTimeMillis());

    }

    @Override

    public void afterAdvice() {

        System.out.println("Method end time: " + System.currentTimeMillis());

    }

}

public class ProxyFactory implements InvocationHandler {

    // 被代理对象

    private Object target;

    // 通知

    private Advice advice;

    /**

     * 通过目标对象返回动态代理对象

     * @return

     */

    public Object getProxy() {

        Object proxy = Proxy.newProxyInstance(target.getClass().getClassLoader(),

                target.getClass().getInterfaces(), this);

        return proxy;

    }

    @Override

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

        advice.beforeAdvice();

        Object obj = method.invoke(target, args);

        advice.afterAdvice();

        return obj;

    }

    public Object getTarget() {

        return target;

    }

    public void setTarget(Object target) {

        this.target = target;

    }

    public Advice getAdvice() {

        return advice;

    }

    public void setAdvice(Advice advice) {

        this.advice = advice;

    }

}

public class BeanFactory {

    Properties prop = new Properties();

    public BeanFactory(InputStream input) {

        try {

            prop.load(input);

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    /**

     * 获取Proxy(代理对象) 的实例

     * @param name

     * @return

     */

    public Object getBean(String name) {

        // 获取ProxyFactory 的class 名称

        String className = prop.getProperty(name + ".proxy");

        Object proxy  = null;

        try {

            // 获取ProxyFactory 的class对象

            Class proxyClass = Class.forName(className);

            proxy = proxyClass.newInstance();

            // 根据配置文件实例化target 与 advice对象

            Object target = Class.forName(prop.getProperty(name + ".target")).newInstance();

            Object advice = Class.forName(prop.getProperty(name + ".advice")).newInstance();

            // 通过内省实现对ProxyFactory的属性赋值

            BeanInfo beanInfo = Introspector.getBeanInfo(proxyClass);

            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();

            for (PropertyDescriptor pd : propertyDescriptors) {

                String propertyName = pd.getName();

                Method writeMethod = pd.getWriteMethod();

                if ("target".equals(propertyName)) {

                    writeMethod.invoke(proxy, target);

                } else if ("advice".equals(propertyName)) {

                    writeMethod.invoke(proxy, advice);

                }

            }

        } catch (ClassNotFoundException e) {

            e.printStackTrace();

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        } catch (InstantiationException e) {

            e.printStackTrace();

        } catch (IntrospectionException e) {

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            e.printStackTrace();

        }

        return proxy;

    }

}

public class AopTest {

    public static void main (String[] args) {

        // 读取配置文件

        InputStream input = Thread.currentThread().getContextClassLoader()

                .getResourceAsStream("cn/latiny/aopa/bean.properties");

        // 创建Bean的工厂类

        BeanFactory beanFactory = new BeanFactory(input);

        // 获取代理对象

        ProxyFactory proxyFactory = (ProxyFactory)beanFactory.getBean("bean");

        // 通过代理对象调用

        IManager bean = (IManager)proxyFactory.getProxy();

        bean.add("Latiny");

    }

}