顺手写的redis分布式锁

    /**
     * 锁定一个key,***一定要手工释放锁
     * 
     * @param key
     * @return
     */
    public boolean lockKey(String key) {
        return redisTemplate.opsForValue().setIfAbsent(key, 0);
    }

    /**
     * 锁定一个key，指定锁定时间
     * 
     * @param key
     * @param time
     * @return
     */
    public boolean lockKey(String key, int locktime) {
        return redisTemplate.opsForValue().setIfAbsent(key, 0, locktime, TimeUnit.SECONDS);
    }

    /**
     * 自旋加锁
     * 
     * @param key
     * @param trytime
     * @return
     */
    public boolean lockKeySpin(String key, int trytime, long sleepTime) {
        for (int i = 0; i < trytime; i++) {
            boolean flag = redisTemplate.opsForValue().setIfAbsent(key, 0);
            if (flag)
                return true;
            try {
                Thread.sleep(sleepTime);
            } catch (InterruptedException e) {
                continue;
            }
        }
        return false;
    }

    /**
     * 锁定一个key，指定锁定时间,***一定要手工释放锁
     * 
     * @param key
     * @param trytime
     * @param sleepTime
     * @param locktime
     * @return
     */
    public boolean lockKeySpin(String key, int trytime, long sleepTime, int locktime) {
        for (int i = 0; i < trytime; i++) {
            boolean flag = redisTemplate.opsForValue().setIfAbsent(key, 0, locktime, TimeUnit.SECONDS);
            if (flag)
                return true;
            try {
                Thread.sleep(sleepTime);
            } catch (InterruptedException e) {
                continue;
            }
        }
        return false;
    }

    /**
     * 释放锁
     * 
     * @param key
     * @return
     */
    public boolean unlockKey(String key) {
        return redisTemplate.delete(key);
    }