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