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LocalIpAddressUtil.java
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package act.util;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
/**
* Credential: source code copied from https://gist.github.com/pfmiles/9f7273b12b4b486e2e9c
*/
class LocalIpAddressUtil {
/**
* 获取本地ip地址，有可能会有多个地址, 若有多个网卡则会搜集多个网卡的ip地址
*/
public static Set<InetAddress> resolveLocalAddresses() {
Set<InetAddress> addrs = new HashSet<InetAddress>();
Enumeration<NetworkInterface> ns = null;
try {
ns = NetworkInterface.getNetworkInterfaces();
} catch (SocketException e) {
// ignored...
}
while (ns != null && ns.hasMoreElements()) {
NetworkInterface n = ns.nextElement();
Enumeration<InetAddress> is = n.getInetAddresses();
while (is.hasMoreElements()) {
InetAddress i = is.nextElement();
if (!i.isLoopbackAddress() && !i.isLinkLocalAddress() && !i.isMulticastAddress()
&& !isSpecialIp(i.getHostAddress())) addrs.add(i);
}
}
return addrs;
}
public static Set<String> resolveLocalIps() {
Set<InetAddress> addrs = resolveLocalAddresses();
Set<String> ret = new HashSet<String>();
for (InetAddress addr : addrs)
ret.add(addr.getHostAddress());
return ret;
}
/**
* 取得当前机器的address信息，若有多个则随机选一个
*/
public static InetAddress resolveLocalAddress() {
Set<InetAddress> addrs = resolveLocalAddresses();
if (addrs != null && !addrs.isEmpty()) return addrs.iterator().next();
return null;
}
public static String ip() {
InetAddress addr = resolveLocalAddress();
if (null == addr) {
// you are running the app in a host without network connection
return "127.0.0.1";
}
return addr.getHostAddress();
}
private static boolean isSpecialIp(String ip) {
if (ip.contains(":")) return true;
if (ip.startsWith("127.")) return true;
if (ip.startsWith("169.254.")) return true;
if (ip.equals("255.255.255.255")) return true;
return false;
}
}