解决1秒钟内，用户快速点击，重复请求的问题

前端也可以处理这个问题，到时绕过前端的情况，就需要后端处理了。

后端处理逻辑：自定义注解+AOP+Redis自动过期key。

1.首先自定义一个注解@NoRepeatSubmit 

// 作用到方法上
@Target(ElementType.METHOD)
// 运行时有效
@Retention(RetentionPolicy.RUNTIME)
public @interface NoRepeatSubmit {
    
    int time() default 3 * 1000;
}

2.在需要拦截的controller上加上注解，作为pointcut切入点。

@RestController
public class HomeController {

    @NoRepeatSubmit
    @RequestMapping(value = "/login", method = RequestMethod.GET)
    public String login(@RequestParam String userName) {
        System.out.println(userName);
        return userName;
    }

    @NoRepeatSubmit
    @RequestMapping(value = "/login2", method = RequestMethod.GET)
    public String login2(@RequestParam String userName2) {
        System.out.println(userName2);
        return userName2;
    }
}

 3.在切面类中判断是否重复提交。

@Slf4j
@Aspect
@Component
public class NoRepeatSubmitAspect {

    @Autowired
    private RedisTemplate redisTemplate;
    @Pointcut("@annotation(noRepeatSubmit)")
    public void pointcut(NoRepeatSubmit noRepeatSubmit) {
    }
    @Before("pointcut(noRepeatSubmit)")
    public void before(final JoinPoint joinPoint, NoRepeatSubmit noRepeatSubmit) throws Exception {
        log.info("joinPoint:"+joinPoint);

        //获取目标类的名称
        String target = joinPoint.getTarget().getClass().getName();
        //获取目标类的方法
        String methodName = joinPoint.getSignature().getName();
        log.info("target:"+target);
        log.info("methodName:"+methodName);

        HttpServletRequest request = ((ServletRequestAttributes) Objects.requireNonNull(RequestContextHolder.getRequestAttributes())).getRequest();
        log.info("request:"+request);
        String url = request.getRequestURL().toString();
        log.info("url:"+url);
        String token = request.getHeader("token");
        log.info("token:"+token);

        //自行定义符合业务需要的key
        String redisKey = target+"_"+methodName+"_"+token;
        if ( redisTemplate.hasKey(redisKey)) {
            throw new Exception( "重复提交");
        }else {
            //此处设置的1秒过期
            redisTemplate.opsForValue().set(redisKey, "不要重复提交！！！",1000, TimeUnit.MILLISECONDS);
            log.info("value:::::"+redisTemplate.opsForValue().get(redisKey));
        }
    }
}

发起请求

 当快速点击两次，就会报错啦