003SpringAOP003基于注解使用

目录

• 1 配置类
• 2 业务核心类
• 3 切面类和通知方法
• 4 测试类

1 配置类

编写配置类代码代替配置文件，扫描包并开启AspectJ功能：

@Configuration
@ComponentScan(basePackages = {"com"})
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class AspectConfig {
}

2 业务核心类

编写业务核心类代码，使用注解加入到IOC容器：

@Component
public class Calculator {
    public int add(int i, int j) {
        System.out.println("add...");
        return i + j;
    }
}

3 切面类和通知方法

编写切面类代码，并使用注解配置切入点表达式和通知方法：

@Component
@Aspect
@Order(1)
public class AspectWork {
    @Pointcut(value = "execution(public int com.service.Calculator.*(int, int))")
    public void pointcut() {
    }
    @Before(value = "pointcut()")
    public void workBefore() {
        System.out.println("WorkBefore...");
    }
    @After(value = "pointcut()")
    public void workAfter() {
        System.out.println("WorkAfter...");
    }
    @AfterReturning(value = "pointcut()", returning = "result")
    public void workAfterReturning(Object result) {
        System.out.println("WorkAfterReturning...");
    }
    @AfterThrowing(value = "pointcut()", throwing = "exception")
    public void workAfterThrowing(Throwable exception) {
        System.out.println("WorkAfterThrowing...");
    }
    // @Around(value = "pointcut()")
    public Object workAround(ProceedingJoinPoint joinPoint) {
        Object result = null;
        try {
            System.out.println("workAround...WorkBefore...");
            result = joinPoint.proceed(joinPoint.getArgs());
            System.out.println("workAround...WorkAfterReturning...");
        } catch (Throwable e) {
            System.out.println("workAround...WorkAfterThrowing...");
            throw new RuntimeException();
        } finally {
            System.out.println("workAround...WorkAfter...");
        }
        return result;
    }
}

4 测试类

编写测试类代码：

public class AspectTest {
    AnnotationConfigApplicationContext ioc = new AnnotationConfigApplicationContext(AspectConfig.class);
    @Test
    public void test() {
        Calculator calculator = ioc.getBean(Calculator.class);
        calculator.add(1, 3);
    }
}