public interface UserReadService {

    public UserInfo getUserInfoById(Long id);

}

public class UserReadServiceImpl implements UserReadService {

    @Override

    public UserInfo getUserInfoById(Long id) {

        System.out.println("获取用户信息");

        return null;

    }

}

public class UserInterceptor implements MethodInterceptor {

        @Override

        public Object invoke(MethodInvocation invocation) throws Throwable {

            System.out.println("start");

            Object obj = invocation.proceed();

            System.out.println("end");

            return obj;

        }

}

    public static void main(String[] args) {

        ProxyFactory factory = new ProxyFactory(new UserReadServiceImpl());

        factory.addAdvice(new UserInterceptor());

        UserReadService userReadService = (UserReadService) factory.getProxy();

        userReadService.getUserInfoById(null);

    }

start

获取用户信息

end