获取本机的真实IP地址

Code：

import java.net.InetAddress;
import java.net.UnknownHostException;
/**
 * 获取本机的真实IP地址。<br>
 * 注意：在Linux下，必须修改主机名（不能使用默认的localhost作为主机名，否则获取到的是127.0.0.1），然后在/etc/hosts下将新主机名绑定为本机IP，方可获得。<br>
 * 以下两个方法都可以。
 * 
 * @author nathan.yuhm
 */
public class Cluster {
    private static String getHostIp() {
        String localhost = "";
        try {
            InetAddress localHost2 = InetAddress.getLocalHost();
            System.out.println("InetAddress.getLocalHost()=" + localHost2);
            localhost = localHost2.getHostAddress();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return localhost;
    }
    private static String getHostIp2() {
        try {
            String hostName = InetAddress.getLocalHost().getHostName();
            System.out.println("InetAddress.getLocalHost().getHostName()=" + hostName);
            InetAddress byName = InetAddress.getByName(hostName);
            System.out.println("InetAddress.getByName(hostName)=" + byName);
            return byName.getHostAddress();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        return null;
    }
    public static void main(String[] args) {
        System.out.println(getHostIp());
        System.out.println(getHostIp2());
    }
}

output：

InetAddress.getLocalHost()=hy-yhm/10.249.196.28
10.249.196.28
InetAddress.getLocalHost().getHostName()=hy-yhm
InetAddress.getByName(hostName)=hy-yhm/10.249.196.28
10.249.196.28

reference：

http://www.cnblogs.com/lidp/archive/2010/02/03/1696471.html

http://blog.sina.com.cn/s/blog_5a08b1780100ceqc.html