Spring AOP初步总结(三)

最近遇到一个新需求：用户多次点击提交订单发生多次扣款，一开始准备配置数据库事务，但后来发现这种方法白白浪费很多资源，就改为利用接口上的切面对请求做拦截，并将当前登陆的用户存进Redis缓存，废话不说了直接上代码；

AOP的应用(模拟请求拦截器):

/**
 * @author YHW
 * @ClassName: ApiMemberAspect
 * @Description:
 * @date 2019/3/21 8:54
 */
@Aspect
@Configuration
public aspect ApiMemberAspect {

    private Logger logger = LoggerFactory.getLogger(getClass());

    private static Gson gson = new Gson();

    //切点绑在注解上方便重用!
    @Pointcut("@annotation(io.renren.common.annotation.RepetitionCheck)")
    public void ApiLogPointCut() {

    }

    @Before("ApiLogPointCut()")
    public void beforeCheck(JoinPoint joinPoint) throws Throwable {
        Object[] paramValues = joinPoint.getArgs();
        String[] paramNames = ((CodeSignature) joinPoint.getSignature()).getParameterNames();
        for(int i = 0; i < paramNames.length; i++){
            if("payType".equals(paramNames[i]) && paramValues[i] != null){
                if(!"membercard".equals(paramValues[i])){
                    return;
                }
            }
        }
        for(int i = 0; i < paramNames.length; i++){
            if ("mobile".equals(paramNames[i]) && paramValues[i] != null) {
                String phone = (String)paramValues[i];
                logger.info(phone);
                RedisUtils redisUtils = new RedisUtils();
                if(redisUtils.get(phone) != null){
                    throw new RRException("操作超时，请等待一会后重试");
                }else{
                    redisUtils.set(phone,phone);
                }
            }
        }
    }

    @After("ApiLogPointCut()")
    public void afterCheck(JoinPoint joinPoint) throws Throwable{
        Object[] paramValues = joinPoint.getArgs();
        String[] paramNames = ((CodeSignature) joinPoint.getSignature()).getParameterNames();
        for(int i = 0; i < paramNames.length; i++){
            if ("mobile".equals(paramNames[i]) && paramValues[i] != null) {
                String phone = (String)paramValues[i];
                logger.info(phone);
                RedisUtils redisUtils = new RedisUtils();
                if(redisUtils.get(phone) != null){
                    redisUtils.delete(phone);
                }
            }
        }

    }

    @AfterThrowing("ApiLogPointCut()")
    public void afterException(JoinPoint joinPoint) throws Throwable{

        Object[] paramValues = joinPoint.getArgs();
        String[] paramNames = ((CodeSignature) joinPoint.getSignature()).getParameterNames();
        for(int i = 0; i < paramNames.length; i++) {
            if ("mobile".equals(paramNames[i]) && paramValues[i] != null) {
                String phone = (String)paramValues[i];
                logger.info(phone);
                RedisUtils redisUtils = new RedisUtils();
                if(redisUtils.get(phone) != null){
                    redisUtils.delete(phone);
                }
            }
        }

    }

}

下面是注解类：

/**
 * @author YHW
 * @ClassName: RepetitionCheck
 * @Description:
 * @date 2019/3/21 8:58
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RepetitionCheck {
    String value() default "";
}

关于Redis就不多提了，自己也是处于只会用用的阶段，以后学习完会单独开一篇Redis专题；