IPUtil工具類，獲取本機、遠程IP的Java代碼

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

import javax.servlet.http.HttpServletRequest;
/**

IP工具類
@author geeksun
2011-9-23
*/
public class IpUtil {
/**

@param 獲取遠程IP
@return IP Address
*/
public static String getIpAddrByRequest(HttpServletRequest request) {
 String ip = request.getHeader("x-forwarded-for");
 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

 ip = request.getHeader("Proxy-Client-IP");

}
 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

 ip = request.getHeader("WL-Proxy-Client-IP");

}
 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

 ip = request.getRemoteAddr();

}
 return ip;
}
/**

@return 獲取本機IP
@throws SocketException
*/
public static String getRealIp() throws SocketException {
 String localip = null;// 本地IP，如果沒有配置外網IP則返回它
 String netip = null;// 外網IP
Enumeration<NetworkInterface> netInterfaces =

 NetworkInterface.getNetworkInterfaces();

InetAddress ip = null;
 boolean finded = false;// 是否找到外網IP
 while (netInterfaces.hasMoreElements() && !finded) {

 NetworkInterface ni = netInterfaces.nextElement();
 Enumeration<InetAddress> address = ni.getInetAddresses();
 while (address.hasMoreElements()) {
     ip = address.nextElement();
     if (!ip.isSiteLocalAddress() 
             && !ip.isLoopbackAddress() 
             && ip.getHostAddress().indexOf(":") == -1) {// 外網IP
         netip = ip.getHostAddress();
         finded = true;
         break;
     } else if (ip.isSiteLocalAddress() 
             && !ip.isLoopbackAddress() 
             && ip.getHostAddress().indexOf(":") == -1) {// 內網IP
         localip = ip.getHostAddress();
     }
 }

}
if (netip != null && !"".equals(netip)) {

 return netip;

} else {

 return localip;

}
}




}</pre>