code: public Jedis getResource(int DBIndex) {
          try {
              if (this.jedisPool == null)
                  throw new NullPointerException(this.name + ", Jedis Pool 未初始化");
  
              Jedis jedis = this.jedisPool.getResource();
  
              jedis.select(DBIndex);
  
              return jedis;
          } catch (JedisConnectionException e) {
              LOG.error(this.name + ", Jedis Pool 连接出现异常", e);
              throw e;
          } catch (JedisException e) {
              LOG.error(this.name + ", Jedis Pool 出现异常", e);
              throw e;
          } catch (Exception e) {
              LOG.error(this.name + ", Jedis Pool 获取连接, 暂时无法识别异常", e);
              throw e;
          }
      }
docs: 获取 Jedis
  
  @return