Java|Java 获取本机IP地址的实例代码 Java获取本机IP地址的实例代码

前言
一、规则
二、获取

1.使用
2.工具类

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; /** * 获取本机IP 地址 * * @author dingwen * 2021.04.28 11:49 */public class IpUtil {/** 获取本机所有网卡信息得到所有IP信息* @return Inet4Address>*/public static List getLocalIp4AddressFromNetworkInterface() throws SocketException {List addresses = new ArrayList<>(1); // 所有网络接口信息Enumeration 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 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; }/*** 过滤回环网卡、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** @param ni 网卡* @return 如果满足要求则true，否则false*/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")); }/*** 判断是否是IPv4，并且内网地址并过滤回环地址.*/private static boolean isValidAddress(InetAddress address) {return address instanceof Inet4Address && address.isSiteLocalAddress() && !address.isLoopbackAddress(); }/** 通过Socket 唯一确定一个IP* 当有多个网卡的时候，使用这种方式一般都可以得到想要的IP。甚至不要求外网地址8.8.8.8是可连通的* @return Inet4Address>*/private static Optional 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(); }/** 获取本地IPv4地址* @return Inet4Address>*/public static Optional getLocalIp4Address() throws SocketException {final List inet4Addresses = getLocalIp4AddressFromNetworkInterface(); if (inet4Addresses.size() != 1) {final Optional 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; /** * 获取本机IP 地址 */public class IpUtil {/** 获取本机所有网卡信息得到所有IP信息* @return Inet4Address>*/public static List getLocalIp4AddressFromNetworkInterface() throws SocketException {List addresses = new ArrayList<>(1); // 所有网络接口信息Enumeration 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 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; }/*** 过滤回环网卡、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** @param ni 网卡* @return 如果满足要求则true，否则false*/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")); }/*** 判断是否是IPv4，并且内网地址并过滤回环地址.*/private static boolean isValidAddress(InetAddress address) {return address instanceof Inet4Address && address.isSiteLocalAddress() && !address.isLoopbackAddress(); }/** 通过Socket 唯一确定一个IP* 当有多个网卡的时候，使用这种方式一般都可以得到想要的IP。甚至不要求外网地址8.8.8.8是可连通的* @return Inet4Address>*/private static Optional 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(); }/** 获取本地IPv4地址* @return Inet4Address>*/public static Optional getLocalIp4Address() throws SocketException {final List inet4Addresses = getLocalIp4AddressFromNetworkInterface(); if (inet4Addresses.size() != 1) {final Optional ipBySocketOpt = getIpBySocket(); if (ipBySocketOpt.isPresent()) {return ipBySocketOpt; } else {return inet4Addresses.isEmpty() ? Optional.empty() : Optional.of(inet4Addresses.get(0)); }}return Optional.of(inet4Addresses.get(0)); }}

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