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前言
在Java中如何准确的获取到本机IP地址呢？网上大部分的做法是InetAddress.getLocalHost().getHostAddress()。这的确能获取到本机IP地址，但是是不准确的。因为忽略了一个问题，网络环境是多变的，一台计算机不同的网卡有多个IP地址，Lan、WiFi、蓝牙、热点、虚拟机网卡等。
一、规则
127.xxx.xxx.xxx 属于 “loopback” 地址，即只能你自己的本机可见，就是本机地址，比较常见的有 127.0.0.1
192.168.xxx.xxx 属于 private 私有地址 (site local address)，属于本地组织内部访问，只能在本地局域网可见
同样 10.xxx.xxx.xxx、从 172.16.xxx.xxx 到172.31.xxx.xxx 都是私有地址，也是属于组织内部访问
169.254.xxx.xxx 属于连接本地地址（link local IP），在单独网段可用
从 224.xxx.xxx.xxx 到 239.xxx.xxx.xxx 属于组播地址
比较特殊的 255.255.255.255 属于广播地址
除此之外的地址就是点对点的可用的公开 IPv4 地址
二、获取
1.使用
public static void main(String[] args) throws SocketException { System.out.println( IpUtil.getLocalIp4Address().get().toString().replaceAll("/","")); }2.工具类
package com.dingwen.test.utils;import org.springframework.util.ObjectUtils;import java.net.*;import java.util.ArrayList;import java.util.Enumeration;import java.util.List;import java.util.Optional;public class IpUtil { public static List<Inet4Address> getLocalIp4AddressFromNetworkInterface() throws SocketException { List<Inet4Address> addresses = new ArrayList<>(1); // 所有网络接口信息 Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces(); if (ObjectUtils.isEmpty(networkInterfaces)) { return addresses; } while (networkInterfaces.hasMoreElements()) { NetworkInterface networkInterface = networkInterfaces.nextElement(); //滤回环网卡、点对点网卡、非活动网卡、虚拟网卡并要求网卡名字是eth或ens开头 if (!isValidInterface(networkInterface)) { continue; } // 所有网络接口的IP地址信息 Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses(); while (inetAddresses.hasMoreElements()) { InetAddress inetAddress = inetAddresses.nextElement(); // 判断是否是IPv4，并且内网地址并过滤回环地址. if (isValidAddress(inetAddress)) { addresses.add((Inet4Address) inetAddress); } } } return addresses; } private static boolean isValidInterface(NetworkInterface ni) throws SocketException { return !ni.isLoopback() && !ni.isPointToPoint() && ni.isUp() && !ni.isVirtual() && (ni.getName().startsWith("eth") || ni.getName().startsWith("ens")); } private static boolean isValidAddress(InetAddress address) { return address instanceof Inet4Address && address.isSiteLocalAddress() && !address.isLoopbackAddress(); } private static Optional<Inet4Address> getIpBySocket() throws SocketException { try (final DatagramSocket socket = new DatagramSocket()) { socket.connect(InetAddress.getByName("8.8.8.8"), 10002); if (socket.getLocalAddress() instanceof Inet4Address) { return Optional.of((Inet4Address) socket.getLocalAddress()); } } catch (UnknownHostException networkInterfaces) { throw new RuntimeException(networkInterfaces); } return Optional.empty(); } public static Optional<Inet4Address> getLocalIp4Address() throws SocketException { final List<Inet4Address> inet4Addresses = getLocalIp4AddressFromNetworkInterface(); if (inet4Addresses.size() != 1) { final Optional<Inet4Address> ipBySocketOpt = getIpBySocket(); if (ipBySocketOpt.isPresent()) { return ipBySocketOpt; } else { return inet4Addresses.isEmpty() ? Optional.empty() : Optional.of(inet4Addresses.get(0)); } } return Optional.of(inet4Addresses.get(0)); }}参考：
https://www.jianshu.com/p/f619663f0f0a
https://www.cnblogs.com/starcrm/p/7071227.html
下面在分享一段Java获取本机IP地址的示例代码
import java.net.*;import java.util.ArrayList;import java.util.Enumeration;import java.util.List;import java.util.Objects;import java.util.Optional;public class IpUtil { public static List<Inet4Address> getLocalIp4AddressFromNetworkInterface() throws SocketException { List<Inet4Address> addresses = new ArrayList<>(1); // 所有网络接口信息 Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces(); if (Objects.isNull(networkInterfaces)) { return addresses; } while (networkInterfaces.hasMoreElements()) { NetworkInterface networkInterface = networkInterfaces.nextElement(); //滤回环网卡、点对点网卡、非活动网卡、虚拟网卡并要求网卡名字是eth或ens开头 if (!isValidInterface(networkInterface)) { continue; } // 所有网络接口的IP地址信息 Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses(); while (inetAddresses.hasMoreElements()) { InetAddress inetAddress = inetAddresses.nextElement(); // 判断是否是IPv4，并且内网地址并过滤回环地址. if (isValidAddress(inetAddress)) { addresses.add((Inet4Address) inetAddress); } } } return addresses; } private static boolean isValidInterface(NetworkInterface ni) throws SocketException { return !ni.isLoopback() && !ni.isPointToPoint() && ni.isUp() && !ni.isVirtual() && (ni.getName().startsWith("eth") || ni.getName().startsWith("ens")); } private static boolean isValidAddress(InetAddress address) { return address instanceof Inet4Address && address.isSiteLocalAddress() && !address.isLoopbackAddress(); } private static Optional<Inet4Address> getIpBySocket() throws SocketException { try (final DatagramSocket socket = new DatagramSocket()) { socket.connect(InetAddress.getByName("8.8.8.8"), 10002); if (socket.getLocalAddress() instanceof Inet4Address) { return Optional.of((Inet4Address) socket.getLocalAddress()); } } catch (UnknownHostException networkInterfaces) { throw new RuntimeException(networkInterfaces); } return Optional.empty(); } public static Optional<Inet4Address> getLocalIp4Address() throws SocketException { final List<Inet4Address> inet4Addresses = getLocalIp4AddressFromNetworkInterface(); if (inet4Addresses.size() != 1) { final Optional<Inet4Address> ipBySocketOpt = getIpBySocket(); if (ipBySocketOpt.isPresent()) { return ipBySocketOpt; } else { return inet4Addresses.isEmpty() ? Optional.empty() : Optional.of(inet4Addresses.get(0)); } } return Optional.of(inet4Addresses.get(0)); }}读到这里，这篇“Java获取本机IP地址的代码怎么写”文章已经介绍完毕，想要掌握这篇文章的知识点还需要大家自己动手实践使用过才能领会，如果想了解更多相关内容的文章，欢迎关注编程网行业资讯频道。
