NIO项目中出现了这个错误：
java.net.ConnectException: Connection refused: no further information
一般是因为InetSocketAddress的主机名、端口号写错，或者要连接的服务器没有启动造成的。
java.net.ConnectException: Connection refused: no further information
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异常 java.net.ConnectException: Connection refused: no further information
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