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Java 返回一个InetAddress对象，该对象封装了最有可能是计算机的LAN IP地址。

欢马劈雪

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返回一个InetAddress对象，该对象封装了最有可能是计算机的LAN IP地址。

实例源码：

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//package com.nowjava;

import java.net.InetAddress;

import java.net.NetworkInterface;/*时代Java公众号 提 供*/

import java.net.UnknownHostException;

import java.util.Enumeration;

public class Main {

public static void main(String[] argv) throws Exception {

System.out.println(getLocalHostLANAddress());

}

/**

* Returns an <code>InetAddress</code> object encapsulating what is most likely the machine's LAN IP address.

* <p/>

* This method is intended for use as a replacement of JDK method <code>InetAddress.getLocalHost</code>, because

* that method is ambiguous on Linux systems. Linux systems enumerate the loopback network interface the same

* way as regular LAN network interfaces, but the JDK <code>InetAddress.getLocalHost</code> method does not

* specify the algorithm used to select the address returned under such circumstances, and will often return the

* loopback address, which is not valid for network communication. Details

* <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4665037">here</a>.

* <p/>

* This method will scan all IP addresses on all network interfaces on the host machine to determine the IP address

* most likely to be the machine's LAN address. If the machine has multiple IP addresses, this method will prefer

* a site-local IP address (e.g. 192.168.x.x or 10.10.x.x, usually IPv4) if the machine has one (and will return the

* first site-local address if the machine has more than one), but if the machine does not hold a site-local

* address, this method will return simply the first non-loopback address found (IPv4 or IPv6).

* <p/>

* If this method cannot find a non-loopback address using this selection algorithm, it will fall back to

* calling and returning the result of JDK method <code>InetAddress.getLocalHost</code>.

* <p/>

* @throws UnknownHostException If the LAN address of the machine cannot be found.

public static InetAddress getLocalHostLANAddress()

throws UnknownHostException {

try {

InetAddress candidateAddress = null;

// Iterate all NICs (network interface cards)...

for (Enumeration<NetworkInterface> ifaces = NetworkInterface

.getNetworkInterfaces(); ifaces.hasMoreElements();) {

NetworkInterface iface = ifaces.nextElement();

// Iterate all IP addresses assigned to each card.../** 来 自 n o w j a v a . c o m - 时代Java**/

for (Enumeration<InetAddress> inetAddrs = iface

.getInetAddresses(); inetAddrs.hasMoreElements();) {

InetAddress inetAddr = inetAddrs.nextElement();

if (!inetAddr.isLoopbackAddress()) {

if (inetAddr.isSiteLocalAddress()) {

// Found non-loopback site-local address. Return it immediately...

return inetAddr;

} else if (candidateAddress == null) {

// Found non-loopback address, but not necessarily site-local.

// Store it as a candidate to be returned if site-local address is not subsequently found...

candidateAddress = inetAddr;

// Note that we don't repeatedly assign non-loopback non-site-local addresses as candidates,

// only the first. For subsequent iterations, candidate will be non-null.

}

if (candidateAddress != null) {

// We did not find a site-local address, but we found some other non-loopback address.

// Server might have a non-site-local address assigned to its NIC (or it might be running

// IPv6 which deprecates the "site-local" concept).

// Return this non-loopback candidate address...

return candidateAddress;

}
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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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