SpringBoot 實(shí)現(xiàn)并發(fā)登錄人數(shù)控制

public class CompareKickOutFilter extends KickOutFilter {
    @Autowired    private UserService userService;
    @Override    public boolean isAccessAllowed(HttpServletRequest request, HttpServletResponse response) {        String token = request.getHeader("Authorization");        String username = JWTUtil.getUsername(token);        String userKey = PREFIX + username;
        RBucket bucket = redissonClient.getBucket(userKey);        String redisToken = bucket.get();
        if (token.equals(redisToken)) {            return true;
        } else if (StringUtils.isBlank(redisToken)) {            bucket.set(token);
        } else {            Long redisTokenUnixTime = JWTUtil.getClaim(redisToken, "createTime").asLong();            Long tokenUnixTime = JWTUtil.getClaim(token, "createTime").asLong();
            // token > redisToken 則覆蓋            if (tokenUnixTime.compareTo(redisTokenUnixTime) > 0) {                bucket.set(token);
            } else {                // 注銷當(dāng)前token                userService.logout(token);                sendJsonResponse(response, 4001, "您的賬號(hào)已在其他設(shè)備登錄");                return false;
            }
        }
        return true;
    }}

public class QueueKickOutFilter extends KickOutFilter {    /**     * 踢出之前登錄的/之后登錄的用戶 默認(rèn)踢出之前登錄的用戶     */    private boolean kickoutAfter = false;    /**     * 同一個(gè)帳號(hào)最大會(huì)話數(shù) 默認(rèn)1     */    private int maxSession = 1;
    public void setKickoutAfter(boolean kickoutAfter) {        this.kickoutAfter = kickoutAfter;    }
    public void setMaxSession(int maxSession) {        this.maxSession = maxSession;    }
    @Override    public boolean isAccessAllowed(HttpServletRequest request, HttpServletResponse response) throws Exception {        String token = request.getHeader("Authorization");        UserBO currentSession = CurrentUser.get();        Assert.notNull(currentSession, "currentSession cannot null");        String username = currentSession.getUsername();        String userKey = PREFIX + "deque_" + username;        String lockKey = PREFIX_LOCK + username;
        RLock lock = redissonClient.getLock(lockKey);
        lock.lock(2, TimeUnit.SECONDS);
        try {            RDeque deque = redissonClient.getDeque(userKey);
            // 如果隊(duì)列里沒有此token，且用戶沒有被踢出；放入隊(duì)列            if (!deque.contains(token) && currentSession.isKickout() == false) {                deque.push(token);            }
            // 如果隊(duì)列里的sessionId數(shù)超出最大會(huì)話數(shù)，開始踢人            while (deque.size() > maxSession) {                String kickoutSessionId;                if (kickoutAfter) { // 如果踢出后者                    kickoutSessionId = deque.removeFirst();                } else { // 否則踢出前者                    kickoutSessionId = deque.removeLast();                }
                try {                    RBucket bucket = redissonClient.getBucket(kickoutSessionId);                    UserBO kickoutSession = bucket.get();
                    if (kickoutSession != null) {                        // 設(shè)置會(huì)話的kickout屬性表示踢出了                        kickoutSession.setKickout(true);                        bucket.set(kickoutSession);                    }
                } catch (Exception e) {                }
            }
            // 如果被踢出了，直接退出，重定向到踢出后的地址            if (currentSession.isKickout()) {                // 會(huì)話被踢出了                try {                    // 注銷                    userService.logout(token);                    sendJsonResponse(response, 4001, "您的賬號(hào)已在其他設(shè)備登錄");
                } catch (Exception e) {                }
                return false;
            }
        } finally {            if (lock.isHeldByCurrentThread()) {                lock.unlock();                LOGGER.info(Thread.currentThread().getName() + " unlock");
            } else {                LOGGER.info(Thread.currentThread().getName() + " already automatically release lock");            }        }
        return true;    }
}

參考文獻(xiàn)：https://blog.csdn.net/qq_14958051/article/details/106516664