Java切面(Aspect)的多种实现方式

public abstract class BaseAspect {
    public void before() { //执行目标方法之前执行的操作 }
    public void after() { //执行目标方法之后执行的操作 }
}
public class UserService extends BaseAspect {
    public void add() {
        before();
        //执行添加用户操作
        after();
    }
}

public interface UserService {
    void add();
}
public class UserServiceImpl implements UserService {
    @Override
    public void add() {
        //执行添加用户操作
    }
}
public class UserServiceProxy implements UserService {
    private UserService userService;
    public UserServiceProxy(UserService userService) {
        this.userService = userService;
    }
    public void add() {
        //在方法执行前添加切面逻辑
        userService.add();
        //在方法执行后添加切面逻辑
    }
}

@Aspect
public class LogAspect {
    @Before("execution(* com.example.UserService.add(..))")
    public void before() {
        //执行目标方法之前执行的操作
    }
    @After("execution(* com.example.UserService.add(..))")
    public void after() {
        //执行目标方法之后执行的操作
    }
}
@Service
public class UserService {
    @LogAspect
    public void add() {
        //执行添加用户操作
    }
}

public interface MyInterface {
    void doSomething();
}
public class MyClass implements MyInterface {
    @Override
    public void doSomething() {
        System.out.println("Doing something...");
    }
}
@Aspect
public class MyAspect {
    @Before("execution(* com.example.MyInterface.doSomething(..))")
    public void beforeDoSomething(JoinPoint joinPoint) {
        Object target = joinPoint.getTarget();
        if (target instanceof MyInterface) {
            // 执行特定的逻辑
            System.out.println("Before doSomething() on MyInterface");
        } else {
            // 执行其他逻辑
            System.out.println("Before doSomething() on other interface");
        }
    }
}

@Aspect
public class MyAspect {
    @Before("execution(* com.example.MyInterface.doSomething(..))")
    public void beforeDoSomething(JoinPoint joinPoint) {
        Object target = joinPoint.getTarget();
        Class<?>[] interfaces = target.getClass().getInterfaces();
        for (Class<?> iface : interfaces) {
            if (iface == MyInterface.class) {
                // 执行特定的逻辑
                System.out.println("Before doSomething() on MyInterface");
                break;
            }
        }
    }
}