redis分布式锁的实现

private static final String LOCK_SUCCESS = "OK";
   private static final String SET_IF_NOT_EXIST = "NX";
   private static final String SET_WITH_EXPIRE_TIME = "PX";

   public boolean tryGetDistributedLock(String lockKey, String requestId, int expireTime) {
       try (Jedis resource = jedisPool.getResource()) {
           String result = resource.set(lockKey, requestId, SET_IF_NOT_EXIST, SET_WITH_EXPIRE_TIME, expireTime);
           if (LOCK_SUCCESS.equals(result)) {
               return true;
           }
       } catch (Exception e) {
           e.printStackTrace();
           return false;
       }
       return false;
   }

   /**
    * 释放锁 - 利用lua脚本
    */
   public boolean unLockByLua(String lockKey, String requestId) {
       String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
       try (Jedis resource = jedisPool.getResource()) {
           Object result = resource.eval(script, Collections.singletonList(lockKey), Collections.singletonList(requestId));
           if (Objects.equals(1, result)) {
               return true;
           }
       }
       return false;
   }

try{

    if(!tryGetDistributedLock(lock,requestId,timeout)){
         throw new MyException("锁等待",403);
    }
       ...需要锁的内容
    }catch(Exception e){
       ...异常捕捉
    }finnaly{
       unLockByLua(lockKey,requestId);
}