spring中纯注解实现Advice

news2024/10/6 16:18:31

背景：课本上是注解和Xml文件混用的方式，研究了一下用配置类加注解和测试方法实现各种通知方式的切入。
1.首先dao的接口，增删改查

public interface UserDaoAspect {
    public void add();
    public void delete();
    public void update();
    public void select();
}

2.dao的实现类

@Repository("UserDaoAspectImpl")
public class UserDaoAspectImpl implements UserDaoAspect{
    @Override
    public void add() {
        System.out.println("添加用户");
    }

    @Override
    public void delete() {
        System.out.println("删除用户");
        //int flag = 1/0;
    }

    @Override
    public void update() {
        System.out.println("更新用户");
    }

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

3.切入面和切入点


@Component
@Aspect
public class AnnotationAdvice {
    @Pointcut("execution(* com.awei.aop.dao.UserDaoAspectImpl.*(..))")
    public void pointcut(){}

    //前置通知
    @Before("pointcut()")
    public void before(JoinPoint joinPoint){
        System.out.println("执行前置通知");
        System.out.println("目标类:"+joinPoint.getTarget());
        System.out.println("目标类的调用方法"+joinPoint.getSignature().getName());
    }
    //返回通知
    @AfterReturning("pointcut()")
    public void afterReturningTest(JoinPoint joinPoint){
        System.out.println("执行了返回通知，且是无异常时的调用");
        System.out.println("被织入增强处理的目标方法："+joinPoint.getSignature().getName());
    }
    //环绕通知
    @Around("pointcut()")
    public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        System.out.println("执行了环绕通知前---------------------------------");
        Object proceed = proceedingJoinPoint.proceed();
        System.out.println("执行了环绕通知后---------------------------------");
        return proceed;
    }
    //异常通知
    @AfterThrowing("pointcut()")
    public void afterException(){
        System.out.println("执行了异常通知");
    }
    //后置通知
    @After("pointcut()")
    public void after(){
        System.out.println("执行了后置通知");
    }
}

4.配置类

@Configuration
@ComponentScan("com.awei.aop") //包扫描
@EnableAspectJAutoProxy //开启自动代理
public class AnnotationConfig {
    
}

5.测试方法

public class AopAnitationTest {
    @Test
    public void aopxml(){//基于AnnotationConfigApplicationContext创建ioc容器
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AnnotationConfig.class);
        UserDaoAspect userDaoAspect = (UserDaoAspect) context.getBean("UserDaoAspectImpl");
        userDaoAspect.add();
    }

}