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Java 如何判断socket的连接状态

1.android 设备在未有设备连接的时候，怎么判断socket是未连接，如果使用API提供的isConnected()的方法会报一个空指针2.当socket连接的设备突然断开怎么实时获取socket的状态3在进行socket通信的时候会出现可以发送数据，却收不到数据，如果处理

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