一种非侵入式的接口幂等性实现方案，非常优雅！

public interface Idempotence {
    /**
     * 检查是否存在幂等号
     * @param idempotenceId 幂等号
     * @return 是否存在
     */
    boolean check(String idempotenceId);
    /**
     * 记录幂等号
     * @param idempotenceId 幂等号
     */
    void record(String idempotenceId);
    /**
     * 记录幂等号
     * @param idempotenceId 幂等号
     * @param time 过期时间
     */
    void record(String idempotenceId, Integer time);
    /**
     * 删除幂等号
     * @param idempotenceId 幂等号
     */
    void delete(String idempotenceId);
}

@Component
public class RedisIdempotence implements Idempotence {
    @Autowired
    private RedisRepository redisRepository;
    @Override
    public boolean check(String idempotenceId) {
        return redisRepository.exists(idempotenceId);
    }
    @Override
    public void record(String idempotenceId) {
        redisRepository.set(idempotenceId,"1");
    }
    @Override
    public void record(String idempotenceId,Integer time) {
        redisRepository.setExpire(idempotenceId,"1",time);
    }
    @Override
    public void delete(String idempotenceId) {
        redisRepository.del(idempotenceId);
    }
}

@Component
public class IdempotenceUtil {
    @Autowired
    private RedisRepository redisRepository;
    /**
     * 生成幂等号
     * @return
     */
    public String generateId() {
        String uuid = UUID.randomUUID().toString();
        String uId=Base64Util.encode(uuid).toLowerCase();
        redisRepository.setExpire(uId,"1",1800);
        return uId;
    }
    /**
     * 从Header里面获取幂等号
     * @return
     */
    public String getHeaderIdempotenceId(){
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        String idempotenceId=request.getHeader("idempotenceId");
        return idempotenceId;
    }
}

/**
 * 接口增加幂等性
 */
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface IdempotenceRequired {
}

@Aspect
@Slf4j
@Component
public class IdempotenceSupportAdvice {
    @Autowired
    private Idempotence idempotence;
    @Autowired
    IdempotenceUtil idempotenceUtil;
    /**
     * 拦截有@IdempotenceRequired 注解 的方法。
     */
    @Pointcut("@annotation(xxx.xxx.IdempotenceRequired)")
    public void idempotenceMethod(){}
    @AfterThrowing(value = "idempotenceMethod()()",throwing = "e")
    public void afterThrowing(Throwable e){
        if(!(e instanceof IdempotencyException)) {
            // 从HTTP header中获取幂等号idempotenceId
            String idempotenceId = idempotenceUtil.getHeaderIdempotenceId();
            idempotence.record(idempotenceId, 1800);
        }
    }
    @Around(value = "idempotenceMethod()")
    public Object around(ProceedingJoinPoint  joinPoint) throws Throwable {
        // 从HTTP header中获取幂等号idempotenceId
        String idempotenceId = idempotenceUtil.getHeaderIdempotenceId();
        if(StringUtils.isEmpty(idempotenceId)){
            //不存在幂等号则不进行额外操作
            return joinPoint.proceed();
        }
        // 前置操作 幂等号是否存在
        boolean existed = idempotence.check(idempotenceId);
        if (!existed) {
            throw new IdempotencyException("{success:false,message:"操作重复，请重新输入幂等号重试！",data:-2}");
        }
        //删除幂等号
        idempotence.delete(idempotenceId);
        Object result = joinPoint.proceed();
        return result;
    }
}

@RequestMapping("/idempotence")
public class IdempotenceController {
    /**
     * 生成幂等号
     * @return
     */
    @GetMapping("/generateId")
    public JsonResult generateId(){
        IdempotenceUtil idempotenceUtil=SpringUtil.getBean(IdempotenceUtil.class);
        String uId=idempotenceUtil.generateId();
        return JsonResult.success("成功生成！").setData(uId);
    }
}

@IdempotenceRequired
@PostMapping("/getUsers")
public JsonResult getUsers(){
    //执行正常业务逻辑
    ...
}