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。
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：
源代码：
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//package com.nowjava;4
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import java.net.InetAddress;6
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import java.net.NetworkInterface;/*时代Java公众号 提 供*/8
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import java.net.UnknownHostException;10
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import java.util.Enumeration;12
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public class Main {15
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public static void main(String[] argv) throws Exception {17
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System.out.println(getLocalHostLANAddress());19
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}21
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/**24
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* Returns an <code>InetAddress</code> object encapsulating what is most likely the machine's LAN IP address.26
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* <p/>28
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* This method is intended for use as a replacement of JDK method <code>InetAddress.getLocalHost</code>, because30
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* that method is ambiguous on Linux systems. Linux systems enumerate the loopback network interface the same32
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* way as regular LAN network interfaces, but the JDK <code>InetAddress.getLocalHost</code> method does not34
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* specify the algorithm used to select the address returned under such circumstances, and will often return the36
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* loopback address, which is not valid for network communication. Details38
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* <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4665037">here</a>.40
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* <p/>42
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* This method will scan all IP addresses on all network interfaces on the host machine to determine the IP address44
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* most likely to be the machine's LAN address. If the machine has multiple IP addresses, this method will prefer46
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* 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 the48
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* first site-local address if the machine has more than one), but if the machine does not hold a site-local50
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* address, this method will return simply the first non-loopback address found (IPv4 or IPv6).52
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* <p/>54
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* If this method cannot find a non-loopback address using this selection algorithm, it will fall back to56
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* calling and returning the result of JDK method <code>InetAddress.getLocalHost</code>.58
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* <p/>60
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*62
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* @throws UnknownHostException If the LAN address of the machine cannot be found.64
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*/66
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public static InetAddress getLocalHostLANAddress()68
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throws UnknownHostException {70
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try {72
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InetAddress candidateAddress = null;74
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// Iterate all NICs (network interface cards)...76
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for (Enumeration<NetworkInterface> ifaces = NetworkInterface78
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.getNetworkInterfaces(); ifaces.hasMoreElements();) {80
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NetworkInterface iface = ifaces.nextElement();82
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// Iterate all IP addresses assigned to each card.../** 来 自 n o w j a v a . c o m - 时代Java**/84
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for (Enumeration<InetAddress> inetAddrs = iface86
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.getInetAddresses(); inetAddrs.hasMoreElements();) {88
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InetAddress inetAddr = inetAddrs.nextElement();90
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if (!inetAddr.isLoopbackAddress()) {92
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if (inetAddr.isSiteLocalAddress()) {95
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// Found non-loopback site-local address. Return it immediately...97
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return inetAddr;99
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} else if (candidateAddress == null) {101
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// Found non-loopback address, but not necessarily site-local.103
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// Store it as a candidate to be returned if site-local address is not subsequently found...105
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candidateAddress = inetAddr;107
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// Note that we don't repeatedly assign non-loopback non-site-local addresses as candidates,109
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// only the first. For subsequent iterations, candidate will be non-null.111
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}113
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}115
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}117
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}119
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if (candidateAddress != null) {121
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// We did not find a site-local address, but we found some other non-loopback address.123
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// Server might have a non-site-local address assigned to its NIC (or it might be running125
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// IPv6 which deprecates the "site-local" concept).127
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// Return this non-loopback candidate address...129
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return candidateAddress;131
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}133
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