综合了网上找的代码，整理的，Windows和Linux都可以用。
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private static String getHostIp(){
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try{
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Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
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while (allNetInterfaces.hasMoreElements()){
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NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
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Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
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while (addresses.hasMoreElements()){
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InetAddress ip = (InetAddress) addresses.nextElement();
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if (ip != null
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&& ip instanceof Inet4Address
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&& !ip.isLoopbackAddress() //loopback地址即本机地址，IPv4的loopback范围是127.0.0.0 ~ 127.255.255.255
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&& ip.getHostAddress().indexOf(":")==-1){
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System.out.println("本机的IP = " + ip.getHostAddress());
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return ip.getHostAddress();
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}
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}
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}
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}catch(Exception e){
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e.printStackTrace();
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}
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return null;
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}