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package  socket;   import  java.net.InetAddress; import  java.net.UnknownHostException;   public  class  TestSocket {        public  static  void  main(String[] args)  throws  UnknownHostException {          InetAddress host = InetAddress.getLocalHost();          String ip =host.getHostAddress();          System.out.println( "本机ip地址："  + ip);      } }