NetUtil.java

package resa.util;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;

/**
 * Created by ding on 14-8-5.
 */
public class NetUtil {

    private static boolean isWindowsOS() {
        String osName = System.getProperty("os.name");
        return osName.toLowerCase().indexOf("windows") > -1;
    }

    public static String getLocalIP() {
        String sIP = "";
        InetAddress ip = null;
        try {
            if (isWindowsOS()) {
                ip = InetAddress.getLocalHost();
            } else {
                boolean bFindIP = false;
                Enumeration<NetworkInterface> netInterfaces = (Enumeration<NetworkInterface>) NetworkInterface
                        .getNetworkInterfaces();
                while (netInterfaces.hasMoreElements()) {
                    if (bFindIP) {
                        break;
                    }
                    NetworkInterface ni = (NetworkInterface) netInterfaces
                            .nextElement();
                    Enumeration<InetAddress> ips = ni.getInetAddresses();
                    while (ips.hasMoreElements()) {
                        ip = ips.nextElement();
                        if (ip.isSiteLocalAddress() && !ip.isLoopbackAddress()
                                && ip.getHostAddress().indexOf(":") == -1) {
                            bFindIP = true;
                            break;
                        }
                    }

                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (null != ip) {
            sIP = ip.getHostAddress();
        }
        return sIP;
    }
}