java实现获取本机ip地址

package getlocalip;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.*;

public class GetLocalIpUtil {

    private static Set machineIps = Collections.synchronizedSet(new HashSet());

    public static Set get() {
        if (!machineIps.isEmpty()) {
            return machineIps;
        }
        try {
            InetAddress[] addresses = getAllLocalUsingNetworkInterface();
            if (addresses == null || addresses.length == 0) {
                System.out.println("定时器本机可用的ip地址失败,getAllLocalUsingNetworkInterface返回0个地址");
                return machineIps;
            }
            for (InetAddress address : addresses) {
                if (!address.getHostAddress().toString().equals("127.0.0.1")) {
                    machineIps.add(address.getHostAddress().toString());
                }
            }
            System.out.println("定时器本机可用的ip地址成功,ip地址：" + machineIps.toString());
        } catch (UnknownHostException e) {
            System.out.println("获取定时器物理IP失败!message={}" + e.getMessage());
        }
        return machineIps;
    }

    private static InetAddress[] getAllLocalUsingNetworkInterface() throws UnknownHostException {
        List