Java 获取本机IP地址
dingwen_blog 人气:0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<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; } /** * 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<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(); } /* * 获取本地IPv4地址 * @return Inet4Address> */ 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; /** * 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<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; } /** * 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<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(); } /* * 获取本地IPv4地址 * @return Inet4Address> */ 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)); } }
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