Java获取系统IP地址

package easyway.tbs.commons;  
  
import java.net.InetAddress;  
import java.net.NetworkInterface;  
import java.net.SocketException;  
import java.net.UnknownHostException;  
import java.util.Enumeration;  
import java.util.Properties;  
import org.apache.log4j.Logger;  
/** 
 *  
 * 本机系统信息 
 * @author longgangbai 
 * 
 */  
public final class SystemHelper {  
    private static final Logger logger = Logger.getLogger(SystemHelper.class);  
  
    //获得系统属性集    
    public static Properties props=System.getProperties();  
    //操作系统名称  
    public static String OS_NAME=getPropertery("os.name");  
    //行分页符  
    public static String OS_LINE_SEPARATOR=getPropertery("line.separator");  
    //文件分隔符号  
    public static String OS_FILE_SEPARATOR=getPropertery("file.separator");  
      
    /** 
     *  
     * 根据系统的类型获取本服务器的ip地址 
     *  
     * InetAddress inet = InetAddress.getLocalHost(); 
     * 但是上述代码在Linux下返回127.0.0.1。 
     * 主要是在linux下返回的是/etc/hosts中配置的localhost的ip地址， 
     * 而不是网卡的绑定地址。后来改用网卡的绑定地址，可以取到本机的ip地址：）： 
     * @throws UnknownHostException  
     */  
    public static InetAddress getSystemLocalIp() throws UnknownHostException{  
        InetAddress inet=null;  
        String osname=getSystemOSName();  
        try {  
            //针对window系统  
            if(osname.equalsIgnoreCase("Windows XP")){  
                    inet=getWinLocalIp();  
            //针对linux系统  
            }else if(osname.equalsIgnoreCase("Linux")){  
                    inet=getUnixLocalIp();  
            }  
            if(null==inet){  
                throw new UnknownHostException("主机的ip地址未知");  
            }  
        }catch (SocketException e) {  
            logger.error("获取本机ip错误"+e.getMessage());  
            throw new UnknownHostException("获取本机ip错误"+e.getMessage());  
        }  
        return inet;  
    }  
    /** 
     * 获取FTP的配置操作系统 
     * @return 
     */  
    public static String getSystemOSName() {  
         //获得系统属性集    
        Properties props=System.getProperties();  
        //操作系统名称  
        String osname=props.getProperty("os.name");    
        if(logger.isDebugEnabled()){  
            logger.info("the ftp client system os Name "+osname);  
        }  
        return osname;  
    }  
    /** 
     * 获取属性的值 
     * @param propertyName 
     * @return 
     */  
    public static String getPropertery(String propertyName){  
        return props.getProperty(propertyName);  
    }  
      
      
    /** 
     * 获取window 本地ip地址 
     * @return 
     * @throws UnknownHostException 
     */  
    private static InetAddress getWinLocalIp() throws UnknownHostException{  
        InetAddress inet = InetAddress.getLocalHost();       
        System.out.println("本机的ip=" + inet.getHostAddress());   
         return inet;  
    }  
    /** 
     *  
     * 可能多多个ip地址只获取一个ip地址 
     * 获取Linux 本地IP地址 
     * @return 
     * @throws SocketException  
     */  
    private static InetAddress getUnixLocalIp() throws SocketException{  
            Enumeration netInterfaces = NetworkInterface.getNetworkInterfaces();  
            InetAddress ip = null;   
            while(netInterfaces.hasMoreElements())       
            {       
                NetworkInterface ni= (NetworkInterface)netInterfaces.nextElement();       
                ip=(InetAddress) ni.getInetAddresses().nextElement();       
                if( !ip.isSiteLocalAddress()       
                        && !ip.isLoopbackAddress()       
                        && ip.getHostAddress().indexOf(":")==-1)       
                {       
                    return ip;  
                }       
                else      
                {       
                    ip=null;       
                }       
            }     
        return null;  
    }  
    /** 
     *  
     * 获取当前运行程序的内存信息 
     * @return 
     */  
    public static final String getRAMinfo() {  
        Runtime rt = Runtime.getRuntime();  
        return "RAM: " + rt.totalMemory() + " bytes total, " + rt.freeMemory() + " bytes free.";  
    }  
}