简单测试AOP五种增强执行时机

news2024/11/24 20:30:17

1. 目标方法类，spring代理bean

@Component
public class Test {
    public void test(){
        System.out.println("test 目标方法");
    }

    public void testException(){
        throw new RuntimeException();
    }
}

2. 配置类

@Configuration
@ComponentScan
@EnableAspectJAutoProxy //启用apsectJ的自动代理
public class Config {
}

3. 切面类

对测试类Test中的test()和testException()方法分别进行测试，并输出，以观察增强方法的执行顺序。

@Aspect  //切面类
@Component
public class AspectOrder {
    @Pointcut("execution(* org.example.test.*.test*(..))")//表示匹配test包下的所有类的test*方法
    private void a() {}
    @Before("a()")//before(切入点表达式)
    public void before() {
        System.out.println("before");
    }
    @Around("a()")
    public Object doAround(ProceedingJoinPoint joinPoint) {
        System.out.println("Around 开始。。。");
        //运行目标方法
        Object proceed = null;
        try {
            proceed = joinPoint.proceed();
        } catch (Throwable e) {
            throw new RuntimeException(e);
        }
        System.out.println("Around 结束。。。");
        return proceed;
    }

    @AfterThrowing(throwing = "e", pointcut = "a()")
    public void doAfterThrowing(RuntimeException e) {
        System.out.println("出现异常：" + e.getMessage());
    }

    @AfterReturning(value = "a()",returning = "retVal") //正常返回执行 returning = "retVal"为返回值
    public void doAfterReturning(Object retVal) {
        System.out.println("AfterReturning");
        
    }

    @After("a()")
    public void doAfter() {
        System.out.println("after");
    }
}

4. 测试类

测试aop五种增强方法执行顺序。

public class Main {
    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(Config.class);
        Test test = (Test) context.getBean("test");
//        test.test();//无异常
        test.testException();//有异常
    }
}