Solve the problem that the user clicks quickly and repeats the request within 1 second

The front end can also handle this problem , Bypass the front end at that time , You need back-end processing .

Back end processing logic ： Custom annotation +AOP+Redis Automatically expire key.

1. First, customize an annotation @NoRepeatSubmit 

//  It works on the method 
@Target(ElementType.METHOD)
//  Run time effective 
@Retention(RetentionPolicy.RUNTIME)
public @interface NoRepeatSubmit {
    /**
     *  Default time 3 second 
     */
    int time() default 3 * 1000;
}

2. Where interception is required controller Add a note to it , As pointcut The breakthrough point .

@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. Determine whether to submit repeatedly in the facet class .

@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);

        // Get the name of the target class 
        String target = joinPoint.getTarget().getClass().getName();
        // Get the method of the target class 
        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);

        // Define what meets the business needs key
        String redisKey = target+"_"+methodName+"_"+token;
        if ( redisTemplate.hasKey(redisKey)) {
            throw new Exception( " Repeated submission ");
        }else {
            // Set here 1 Seconds expired 
            redisTemplate.opsForValue().set(redisKey, " Don't repeat the submission ！！！",1000, TimeUnit.MILLISECONDS);
            log.info("value:::::"+redisTemplate.opsForValue().get(redisKey));
        }
    }
}

Initiate request

  When you quickly click twice , It will be wrong