java取本机IP —Java教程网

支持Windows,Linux, 支持多网卡(根据网卡取本机配置的IP)

/**
* 根据网卡取本机配置的IP
* 如果是双网卡的，则取出外网IP
* @return
*/
public static String getIp(){
String localip=null;//本地IP，如果没有配置外网IP则返回它
String netip=null;//外网IP
try {
Enumeration<NetworkInterface> netInterfaces =
NetworkInterface.getNetworkInterfaces();
InetAddress ip = null;
boolean finded=false;//是否找到外网IP
while(netInterfaces.hasMoreElements() && !finded){
NetworkInterface ni=netInterfaces.nextElement();
Enumeration<InetAddress> address=ni.getInetAddresses();
while(address.hasMoreElements()){
ip=address.nextElement();
System.out.println(ni.getName() +";"+ip.getHostAddress() +";ip.isSiteLocalAddress()="+ip.isSiteLocalAddress()+";ip.isLoopbackAddress()="+ip.isLoopbackAddress());
if( !ip.isSiteLocalAddress() && !ip.isLoopbackAddress()
&& ip.getHostAddress().indexOf(":")==-1){//外网IP
netip=ip.getHostAddress();
finded=true;
break;
}else if(ip.isSiteLocalAddress() && !ip.isLoopbackAddress()
&& ip.getHostAddress().indexOf(":")==-1){//内网IP
localip=ip.getHostAddress();
}
}
}
} catch (SocketException e) {
e.printStackTrace();
}
if(netip!=null && !"".equals(netip)){
return netip;
}else{
return localip;
}
}

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