基于注解的AOP

1、引入依赖

    <!--spring aop依赖-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>6.0.2</version>
    </dependency>
    <!--spring aspects依赖-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
        <version>6.0.2</version>
    </dependency>

2、定义接口和实现类

public interface Calculator {
    int add(int a,int b);
    int sub(int a,int b);
    int mul(int a,int b);
    int div(int a,int b);
}

public class CalculatorImpl implements Calculator{
    @Override
    public int add(int a, int b) {
        int  res = a+b;
        System.out.println("res："+res);
        return res;
    }

    @Override
    public int sub(int a, int b) {
        int  res = a-b;
        System.out.println("res："+res);
        return res;
    }

    @Override
    public int mul(int a, int b) {
        int  res = a*b;
        System.out.println("res："+res);
        return res;
    }

    @Override
    public int div(int a, int b) {
        int  res = a/b;
        System.out.println("res："+res);
        return res;
    }
}

3、配置类

@Configuration
@ComponentScan(value = "com.jixian")
@EnableAspectJAutoProxy
public class SpringConfig {
}

4、切面类

@Aspect
@Component
public class AspectLog {

    @Before(value = "execution(public int com.jixian.CalculatorImpl.*(..))")
    public void beforeMethod(){
        System.out.println("前置通知...");
    }
    @After(value = "execution(* com.jixian.CalculatorImpl.*(..))")
    public void afterMethod(){
        System.out.println("后置通知...");
    }
    @AfterReturning(value = "execution(* com.jixian.CalculatorImpl.*(..))")
    public void afterReturn(){
        System.out.println("返回通知...");
    }
    @AfterThrowing(value = "execution(* com.jixian.CalculatorImpl.*(..))")
    public void throwMethod(){
        System.out.println("异常通知...");
    }
    @Around(value = "execution(* com.jixian.CalculatorImpl.*(..))")
    public Object aroundMethod(ProceedingJoinPoint joinPoint){
        Object o = null;
        try {
            System.out.println("环绕通知...方法执行前");
             o = joinPoint.proceed();
            System.out.println("环绕通知...返回值后");
        } catch (Throwable throwable) {
            throwable.printStackTrace();
            System.out.println("环绕通知...出现异常");
        } finally {
            System.out.println("环绕通知...方法执行后");
        }
        return o;
    }
}

5、测试

        ApplicationContext context = new AnnotationConfigApplicationContext("com.jixian");
        Calculator calculator = context.getBean(Calculator.class);
        calculator.div(12,1);