Java工具~获取客户端IP信息

import org.apache.log4j.Logger;

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

​​/**
 * @author 赵超
 * @e-mail 18701321850@163.com
 * @description 常用获取客户端信息的工具
 * @createTime 2017/6/24 - 16:36.
 */​​
 ​​public final class NetworkUtil {
 /**
 * Logger for this class
 */
 private static Logger logger = Logger.getLogger(NetworkUtil.class);

 /**
 * 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 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");
// 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;
 }
}​​