java获取服务器ip地址的工具类

参考：

https://www.cnblogs.com/raphael5200/p/5996464.html

代码实现

import lombok.extern.slf4j.Slf4j;

import java.net.*;
import java.util.Enumeration;

@Slf4j
public class IpUtil {
    public static final String DEFAULT_IP = "127.0.0.1";

    /**
     * 直接根据第一个网卡地址作为其内网ipv4地址，避免返回 127.0.0.1
     *
     * @return
     */
    public static String getLocalIpByNetcard() {
        try {
            for (Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces(); e.hasMoreElements(); ) {
                NetworkInterface item = e.nextElement();
                for (InterfaceAddress address : item.getInterfaceAddresses()) {
                    if (item.isLoopback() || !item.isUp()) {
                        continue;
                    }
                    if (address.getAddress() instanceof Inet4Address) {
                        Inet4Address inet4Address = (Inet4Address) address.getAddress();
                        return inet4Address.getHostAddress();
                    }
                }
            }
            return InetAddress.getLocalHost().getHostAddress();
        } catch (SocketException | UnknownHostException e) {
            log.info("获取ip异常");
            return DEFAULT_IP;
        }
    }

    public static String getLocalIP() {
        try {
            return InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
            throw new RuntimeException(e);
        }
    }

    public static String getLinuxLocalIp() {
        String ip = "";
        try {
            for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
                NetworkInterface intf = en.nextElement();
                String name = intf.getName();
                if (!name.contains("docker") && !name.contains("lo")) {
                    for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
                        InetAddress inetAddress = enumIpAddr.nextElement();
                        if (!inetAddress.isLoopbackAddress()) {
                            String ipaddress = inetAddress.getHostAddress().toString();
                            if (!ipaddress.contains("::") && !ipaddress.contains("0:0:") && !ipaddress.contains("fe80")) {
                                ip = ipaddress;
                            }
                        }
                    }
                }
            }
        } catch (SocketException ex) {
            log.info("获取ip异常",ex);
            ip = getLocalIpByNetcard();
        }
        return ip;
    }
}