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Cattle framework utils component pom
There is a newer version: 1.0.1-M3
/*
 * Copyright (C) 2018 the original author or authors.
 *
 * 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 org.cattleframework.utils.auxiliary;

import java.io.IOException;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;

/**
 * 网络工具
 * 
 * @author orange
 *
 */
public final class NetUtils {

    private static final String DEFAULT_INET4_ADDRESS = "127.0.0.1";

    private NetUtils() {
    }

    public static Set getInet4Addresses() {
	Set inetAddresses = new HashSet();
	try {
	    for (Enumeration nics = NetworkInterface.getNetworkInterfaces(); nics
		    .hasMoreElements();) {
		NetworkInterface ifc = nics.nextElement();
		if (ifc.isUp()) {
		    for (Enumeration addrs = ifc.getInetAddresses(); addrs.hasMoreElements();) {
			InetAddress address = addrs.nextElement();
			if (address instanceof Inet4Address && !address.isLoopbackAddress()) {
			    inetAddresses.add(address);
			}
		    }
		}
	    }
	} catch (SocketException e) {
	}
	return inetAddresses;
    }

    public static Set getInet6Addresses() {
	Set inetAddresses = new HashSet();
	try {
	    for (Enumeration nics = NetworkInterface.getNetworkInterfaces(); nics
		    .hasMoreElements();) {
		NetworkInterface ifc = nics.nextElement();
		if (ifc.isUp() || !ifc.isVirtual() || !ifc.isLoopback()) {
		    for (Enumeration addrs = ifc.getInetAddresses(); addrs.hasMoreElements();) {
			InetAddress address = addrs.nextElement();
			if (address instanceof Inet6Address
				// filter ::1
				&& !address.isLoopbackAddress()
				// filter fe80::/10
				&& !address.isLinkLocalAddress()
				// filter ::/128
				&& !address.isAnyLocalAddress()
				// filter fec0::/10,which was discarded, but some
				// address may be deployed.
				&& !address.isSiteLocalAddress()
				// filter fd00::/8
				&& !isUniqueLocalAddress(address)) {
			    inetAddresses.add(address);
			}
		    }
		}
	    }
	} catch (IOException e) {
	}
	return inetAddresses;
    }

    public static InetAddress findFirstInet4Address() {
	InetAddress result = null;
	try {
	    int lowest = Integer.MAX_VALUE;
	    for (Enumeration nics = NetworkInterface.getNetworkInterfaces(); nics
		    .hasMoreElements();) {
		NetworkInterface ifc = nics.nextElement();
		if (ifc.isUp()) {
		    if (ifc.getIndex() < lowest || result == null) {
			lowest = ifc.getIndex();
		    } else {
			continue;
		    }
		    for (Enumeration addrs = ifc.getInetAddresses(); addrs.hasMoreElements();) {
			InetAddress address = addrs.nextElement();
			if (address instanceof Inet4Address && !address.isLoopbackAddress()) {
			    result = address;
			}
		    }
		}
	    }
	} catch (IOException e) {
	}
	if (result != null) {
	    return result;
	}
	try {
	    return InetAddress.getLocalHost();
	} catch (UnknownHostException e) {
	}
	return null;
    }

    public static InetAddress findFirstInet6Address() {
	InetAddress result = null;
	try {
	    for (Enumeration nics = NetworkInterface.getNetworkInterfaces(); nics
		    .hasMoreElements();) {
		NetworkInterface ifc = nics.nextElement();
		if (ifc.isUp() || !ifc.isVirtual() || !ifc.isLoopback()) {
		    for (Enumeration addrs = ifc.getInetAddresses(); addrs.hasMoreElements();) {
			InetAddress inetAddress = addrs.nextElement();
			if (inetAddress instanceof Inet6Address
				// filter ::1
				&& !inetAddress.isLoopbackAddress()
				// filter fe80::/10
				&& !inetAddress.isLinkLocalAddress()
				// filter ::/128
				&& !inetAddress.isAnyLocalAddress()
				// filter fec0::/10,which was discarded, but some
				// address may be deployed.
				&& !inetAddress.isSiteLocalAddress()
				// filter fd00::/8
				&& !isUniqueLocalAddress(inetAddress)) {
			    result = inetAddress;
			    break;
			}
		    }
		}
	    }
	} catch (IOException e) {
	}
	if (result != null) {
	    return result;
	}
	try {
	    return InetAddress.getLocalHost();
	} catch (UnknownHostException e) {
	}
	return null;
    }

    private static boolean isUniqueLocalAddress(InetAddress inetAddress) {
	byte[] ip = inetAddress.getAddress();
	return (ip[0] & 0xff) == 0xfd;
    }

    public static InetAddress getLocalHost() {
	InetAddress localHost = null;
	try {
	    localHost = InetAddress.getLocalHost();
	} catch (UnknownHostException e) {
	}
	return localHost;
    }

    public static String getHostAddress(InetAddress inetAddress) {
	if (inetAddress == null) {
	    return DEFAULT_INET4_ADDRESS;
	}
	String hostAddress = inetAddress.getHostAddress();
	if (inetAddress instanceof Inet6Address) {
	    int index = hostAddress.indexOf("%");
	    if (index != -1) {
		hostAddress = hostAddress.substring(0, index);
	    }
	}
	return hostAddress;
    }
}