java获取Ip

Java获取IP

import java.net.InetAddress;

import java.net.NetworkInterface;

import java.net.SocketException;

import java.util.Enumeration;

 

import javax.servlet.http.HttpServletRequest;

 

/**

 * IP工具类

 * @author geeksun

 * 2011-9-23

 */

public class IpUtil {

 

/**

 * @param request 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 本机IP

 * @throws SocketException

 */

public static String getRealIp() throws SocketException {

String localip = null;// 本地IP，如果没有配置外网IP则返回它

String netip = null;// 外网IP

 

Enumeration<NetworkInterface> netInterfaces = 

NetworkInterface.getNetworkInterfaces();

InetAddress ip = null;

boolean finded = false;// 是否找到外网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) {// 外网IP

netip = ip.getHostAddress();

finded = true;

break;

} else if (ip.isSiteLocalAddress() 

&& !ip.isLoopbackAddress() 

&& ip.getHostAddress().indexOf(":") == -1) {// 内网IP

localip = ip.getHostAddress();

}

}

}

 

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

return netip;

} else {

return localip;

}

}

 

}