java中获取本机IP

1.背景

2.代码

package com.XXX.common.util;

import cn.hutool.core.util.StrUtil;
import lombok.extern.slf4j.Slf4j;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

@Slf4j
public class HostUtil {

    private static String ipAddress = null;

    public static String getLocalIp() {
        if (!StrUtil.isEmpty(ipAddress)) {
            return ipAddress;
        }
        try {
            ipAddress = getLocalIpAddress();
        } catch (Exception e) {
            log.error("获取IP异常: ", e);
        }
        return ipAddress;
    }

    private static String getLocalIpAddress() throws SocketException {
        List<String> list = new ArrayList<>();
        Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
        while (networkInterfaces.hasMoreElements()) {
            NetworkInterface networkInterface = networkInterfaces.nextElement();
            Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();
            while (addresses.hasMoreElements()) {
                InetAddress address = addresses.nextElement();
                if (!address.isLinkLocalAddress() && !address.isLoopbackAddress() && address instanceof Inet4Address) {
                    list.add(address.getHostAddress());
                }
            }
        }
        return String.join(";", list);
    }
}