1、AOP

1.1、开启自动代理功能

在java配置类上添加注解@EnableAspectJAutoProxy

@Configuration
@EnableAspectJAutoProxy
@ComponentScan(value = "com.xyulu"
        ,excludeFilters = {@ComponentScan.Filter(type = FilterType.ANNOTATION,value = {Controller.class})})
public class AopConfig {
}

1.2、定义切面类

@Component
@Aspect
public class LogAspects {

}

1.3、定义切点

	@Pointcut(value = "execution(* com.xyulu..*(..))")
    public void pointCut() {

    }

1.4、定义通知

@Before：在目标方法执行前执行通知；
@After：在目标方法执行后执行通知；
@AfterReturning：在目标方法执行完成后执行通知；
@AfterThrowing：在目标方法抛出异常后执行通知；
@Around：可在目标方法执行前后自定义通知行为；

切点表达式
摘自https://blog.csdn.net/longyanchen/article/details/94486678

图片摘自https://blog.csdn.net/longyanchen/article/details/94486678

代码示例

	@Pointcut(value = "execution(* com.xyulu..*(..))")
    public void pointCut() {

    }

    @Before(value = "pointCut()")
    public void before(JoinPoint joinPoint) {
        System.out.println("@Before,方法名:"+joinPoint.getSignature().getName()+",参数:"+ Arrays.asList(joinPoint.getArgs()));
    }

    @After(value = "pointCut()")
    public void after(JoinPoint joinPoint) {
        System.out.println("@After,方法名:"+joinPoint.getSignature().getName());
    }

    @AfterReturning(value = "pointCut()",returning = "result")
    public void afterReturn(Object result) {
        System.out.println("运行成功,@AfterReturning:"+result);
    }

    @AfterThrowing(value = "pointCut()",throwing = "exception")
    public void exception(Exception exception) {
        System.out.println("@AfterThrowing,error is:{}");
    }