import java.io.Serializable;

import java.net.InetAddress;

import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;

public class IpUtil implements Serializable {

    private static final long serialVersionUID = -2714197398219631534L;

    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;

    }

    public static String getIpAddr(HttpServletRequest request) {

        String ipAddress = null;

        ipAddress = request.getHeader("x-forwarded-for");

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

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

        }

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

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

        }

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

            ipAddress = request.getRemoteAddr();

            // 这里主要是获取本机的ip,可有可无

            if (ipAddress.equals("127.0.0.1")

                    || ipAddress.endsWith("0:0:0:0:0:0:1")) {

                // 根据网卡取本机配置的IP

                InetAddress inet = null;

                try {

                    inet = InetAddress.getLocalHost();

                } catch (UnknownHostException e) {

                    e.printStackTrace();

                }

                ipAddress = inet.getHostAddress();

            }

        }

        // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割

        if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()

                                                            // = 15

            if (ipAddress.indexOf(",") > 0) {

                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));

            }

        }

        return ipAddress;

    }

}