<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

redis:
  host: 127.0.0.1
  port: 6379
  database: 0
  password:
  # 連接超時(shí)時(shí)間
  timeout: 10s

/**
 * 防止表單重復(fù)提交注解
 */
@Target(ElementType.METHOD) // 注解的作用目標(biāo)為方法
@Retention(RetentionPolicy.RUNTIME) // 注解的保留期限為運(yùn)行時(shí)
public @interface PreventDuplicateSubmission {
    /**
     * 時(shí)間（s）
     */
    int time() default 3;
}

@Aspect // 表明這是一個(gè)切面類
@Component // 表示這是一個(gè)Bean
public class DuplicateSubmissionAspect {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    
// 定義切入點(diǎn)，即標(biāo)注了@PreventDuplicateSubmission注解的方法
    @Pointcut("@annotation(com.example.demo.annotation.PreventDuplicateSubmission)")
    public void preventDuplicateSubmission() {
    }

    @Around("preventDuplicateSubmission()")
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        assert attributes != null;
        HttpServletRequest request = attributes.getRequest();
        String requestURI = request.getRequestURI();
        String key = requestURI + ":" + JSON.toJSONString(request.getParameterMap());

        if (stringRedisTemplate.hasKey(key)) { // 如果Redis中已存在該請(qǐng)求
            throw new RuntimeException("請(qǐng)勿重復(fù)提交");
        }
        // 獲取注解的參數(shù)
        PreventDuplicateSubmission formSubmission = ((MethodSignature) pjp.getSignature()).getMethod().getAnnotation(PreventDuplicateSubmission.class);
        int time = formSubmission.time();
        // 設(shè)置請(qǐng)求的key和value，有效期為3秒
        stringRedisTemplate.opsForValue().set(key, "1", time, TimeUnit.SECONDS);
        return pjp.proceed();
    }
}