吃透Spring源码（十八）：AOP创建过程之注解配置方式

一，例子准备

切面类：LogUtil.java

@Aspect
@Component
public class LogUtil {
   
     

    @Pointcut("execution(public Integer com.mashibing.aop.annotation.service.MyCalculator.*(Integer,Integer))")
    public void myPointCut(){
   
     }

    @Around("myPointCut()")
    public Object around(ProceedingJoinPoint pjp) throws Throwable {
   
     
        Signature signature = pjp.getSignature();
        Object[] args = pjp.getArgs();
        Object result = null;
        try {
   
     
            System.out.println("log---环绕通知start："+signature.getName()+"方法开始执行，参数为："+Arrays.asList(args));
            result = pjp.proceed(args);
            System.out.println("log---环绕通知stop"+signature.getName()+"方法执行结束");
        } catch (Throwable throwable) {
   
     
            System.out.println("log---环绕异常通知："+signature.getName()+"出现异常");
            throw throwable;
        }finally {
   
     
            System.out.println("log---环绕返回通知："+signature.getName()+"方法返回结果是："+result);
        }
        return result;
    }

    @Before(value = "myPointCut()")
    private int start(JoinPoint joinPoint){
   
     
        //获取方法签名
        Signature signature = joinPoint.getSignature();
        //获取参数信息
        Object[] args = joinPoint.getArgs();
        System.out.println("log---"+signature.getName()+"方法开始执行：参数是"+Arrays.asList(args));
        return 100;
    }

    @After("myPointCut()")
    public static void logFinally(JoinPoint joinPoint){
   
     
        Signature signature = joinPoint.getSignature();
        System.out.println("log---"+signature.getName()+"方法执行结束。。。。。over");
    }
    @AfterReturning(value = "myPointCut()",returning = "result")
    public static void stop(JoinPoint joinPoint,Object result){
   
     
        Signature signature = joinPoint.getSignature();
        System.out.println("log---"+signature.getName()+"方法执行结束，结果是："+result);
    }

    @AfterThrowing(value = "myPointCut()",throwing = "e")
    public static void logException(JoinPoint joinPoint,Exception e){
   
     
        Signature signature = joinPoint.getSignature();
        System.out.println("log---"+signature.getName()+"方法抛出异常："+e.getMessage());
    }
}