public void sendUserList() {
		StringBuilder nameList = new StringBuilder();//用于存放在线用户列表
		nameList.append(CommonUtil.USER_LIST);
		for (int i = 0; i < clients.size(); i++) {
			Vclient c = clients.get(i);
			nameList.append(c.getName()).append("\n");
		}
		sendMessage(nameList);
	}