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服务器端 ServerSocket 获取到客户端的连接后得到一个Socket。当客户端关闭的时候
比如断开了网络，关闭了JVM。服务器这端如何判断Socket是已经关闭的了? 我发现什么方法都不好使呀。请给出有效判断方法，谢谢!
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加入心跳，服务端一定时长没有收到客户端端的心跳信息，就自动断开
楼上正解。