aop 通过注解简单实现

//1.首先开启自动代理
@Configuration
@EnableAspectJAutoProxy
public class TokenEndPointAspectConfiguration {
    @Bean
    public TokenEndPointAspec tokenEndPointAspec() {
        return new TokenEndPointAspec();
    }
}

//2.定义切面
//在配置类TokenEndPointAspectConfiguration中已经定义bean，这里可以不用使用注解@Component
 @Aspect public class TokenEndPointAspec {

 }

    /**

     *3。定义切点
     *com.company.controller.*.*(..))调用controller包下的任意类的任意方法时均会调用此方法 
*/ 
@Pointcut("execution(* com.company.controller.*.*(..)))") 
public void loggingPointcut() {
 // Method is empty as this is just a Pointcut, the implementations are in the 
 // advices. 
}

//4.定义通知
@Around("loggingPointcut()")
    public Object run2(ProceedingJoinPoint joinPoint) throws Throwable {
        //获取方法参数值数组
        Object[] args = joinPoint.getArgs();
        //得到其方法签名
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        //获取方法参数类型数组
        Class[] paramTypeArray = methodSignature.getParameterTypes();
        if (EntityManager.class.isAssignableFrom(paramTypeArray[paramTypeArray.length - 1])) {
            //如果方法的参数列表最后一个参数是entityManager类型，则给其赋值
            args[args.length - 1] = entityManager;
        }
        logger.info("请求参数为{}",args);
        //动态修改其参数
        //注意，如果调用joinPoint.proceed()方法，则修改的参数值不会生效，必须调用joinPoint.proceed(Object[] args)
        Object result = joinPoint.proceed(args);
        logger.info("响应结果为{}",result);
        //如果这里不返回result，则目标对象实际返回值会被置为null
        return result;
    }