透过代理获取客户端请求的真实ip

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
* Created by wuyanfeng on 2015/11/23.
*/
public class NetworkUtil {
/**
* 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址;
*
* @param request
* @return
* @throws java.io.IOException
*/
public final static String getIpAddress(HttpServletRequest request) throws IOException {
// 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址

String ip = request.getHeader("X-Forwarded-For");
System.out.println("netWorkUtils getIp:"+ip);
//        if (logger.isInfoEnabled()) {
////            logger.info("getIpAddress(HttpServletRequest) - X-Forwarded-For - String ip=" + ip);
//        }

if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//                ip = request.getHeader("Proxy-Client-IP");
//                if (logger.isInfoEnabled()) {
////                    logger.info("getIpAddress(HttpServletRequest) - Proxy-Client-IP - String ip=" + ip);
//                }
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
//                if (logger.isInfoEnabled()) {
////                    logger.info("getIpAddress(HttpServletRequest) - WL-Proxy-Client-IP - String ip=" + ip);
//                }
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("HTTP_CLIENT_IP");
//                if (logger.isInfoEnabled()) {
//                    logger.info("getIpAddress(HttpServletRequest) - HTTP_CLIENT_IP - String ip=" + ip);
//                }
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("HTTP_X_FORWARDED_FOR");
//                if (logger.isInfoEnabled()) {
//                    logger.info("getIpAddress(HttpServletRequest) - HTTP_X_FORWARDED_FOR - String ip=" + ip);
//                }
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
//                if (logger.isInfoEnabled()) {
//                 logger.info("getIpAddress(HttpServletRequest) - getRemoteAddr - String ip=" + ip);
//                }
}
} else if (ip.length() > 15) {
String[] ips = ip.split(",");
for (int index = 0; index < ips.length; index++) {
String strIp = (String) ips[index];
if (!("unknown".equalsIgnoreCase(strIp))) {
ip = strIp;
break;
}
}
}
return ip;
}
}