io.github.liuruinian.uid.utils.NetUtils Maven / Gradle / Ivy
/*
* Copyright (c) 2017 Baidu, Inc. All Rights Reserve.
*
* 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.
*/
package io.github.liuruinian.uid.utils;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
/**
* NetUtils
*
* @author yutianbao
*/
public abstract class NetUtils {
/**
* Pre-loaded local address
*/
public static InetAddress localAddress;
static {
try {
localAddress = getLocalInetAddress();
} catch (SocketException e) {
throw new RuntimeException("fail to get local ip.");
}
}
/**
* Retrieve the first validated local ip address(the Public and LAN ip addresses are validated).
*
* @return the local address
* @throws SocketException the socket exception
*/
public static InetAddress getLocalInetAddress() throws SocketException {
// enumerates all network interfaces
Enumeration enu = NetworkInterface.getNetworkInterfaces();
while (enu.hasMoreElements()) {
NetworkInterface ni = enu.nextElement();
if (ni.isLoopback()) {
continue;
}
Enumeration addressEnumeration = ni.getInetAddresses();
while (addressEnumeration.hasMoreElements()) {
InetAddress address = addressEnumeration.nextElement();
// ignores all invalidated addresses
if (address.isLinkLocalAddress() || address.isLoopbackAddress() || address.isAnyLocalAddress()) {
continue;
}
return address;
}
}
throw new RuntimeException("No validated local address!");
}
/**
* Retrieve local address
*
* @return the string local address
*/
public static String getLocalAddress() {
return localAddress.getHostAddress();
}
}