@Override
		public void run() {
			try {
				while (!shutdown) {
					synchronized (this) {
						wait(5000);
						// 关闭过期连接 
						connMgr.closeExpiredConnections();
						// 可选地，关闭空闲超过30秒的连接 
						connMgr.closeIdleConnections(30, TimeUnit.SECONDS);
						//logger.debug("当前池中连接："+connMgr.getConnectionsInPool());
					}
				}
			} catch (InterruptedException ex) {
				// 终止 
			}
		}