修改区域添加时，区域编号重复检查功能。

侯瑞军

2020-04-09 4c517057e540851198b28b6f2134366dc0f2af47

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com\kidgrow\websocket\config\WebSocketConfig.class
com\kidgrow\websocket\controller\WebSocketController.class
com\kidgrow\websocket\server\SocketServer.class
com\kidgrow\websocket\entity\Client.class
com\kidgrow\WebSocketApplication.class