Java 获取本地 IP 地址

IPUtil.java

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;

import org.apache.log4j.Logger;

public abstract class IPUtil {

    private static Logger logger = Logger.getLogger(IPUtil.class);

	public static Collection<InetAddress> getAllHostAddress() {
		try {
			Enumeration<NetworkInterface> networkInterfaces = NetworkInterface
					.getNetworkInterfaces();
			Collection<InetAddress> addresses = new ArrayList<InetAddress>();

			while (networkInterfaces.hasMoreElements()) {
				NetworkInterface networkInterface = networkInterfaces
						.nextElement();
				Enumeration<InetAddress> inetAddresses = networkInterface
						.getInetAddresses();
				while (inetAddresses.hasMoreElements()) {
					InetAddress inetAddress = inetAddresses.nextElement();
					addresses.add(inetAddress);
					logger.info("Host Address:" + inetAddress.getHostAddress()
							+ " @ " + inetAddress.getHostName());
				}
			}

			return addresses;
		} catch (SocketException e) {
			throw new RuntimeException(e.getMessage(), e);
		}
	}

	public static Collection<String> getAllNoLoopbackAddresses() {
		Collection<String> noLoopbackAddresses = new ArrayList<String>();
		Collection<InetAddress> allInetAddresses = getAllHostAddress();

		for (InetAddress address : allInetAddresses) {
			if (!address.isLoopbackAddress()) {
				noLoopbackAddresses.add(address.getHostAddress());
			}
		}

		return noLoopbackAddresses;
	}

	public static String getFirstNoLoopbackAddress() {
		Collection<String> allNoLoopbackAddresses = getAllNoLoopbackAddresses();
		return allNoLoopbackAddresses.iterator().next();
	}
}