提供一个获取ip地址的工具类

package com.leo.util;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
/*** @ClassName: HttpUtil* @Description: 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;* @Author: leo825* @Date: 2020-06-04 23:02* @Version: 1.0*/
public class HttpUtil {//日志文件private static final Logger logger = LogManager.getLogger();//获取真实IP地址public final static String getIpAddr(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("X-Forwarded-For - String ip=" + ip);}//如果以上获取的的ip是空的或者是unknownif (ip == null || ip.trim().length() == 0 || "unknown".equalsIgnoreCase(ip)) {if (ip == null || ip.trim().length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = request.getHeader("Proxy-Client-IP");if (logger.isInfoEnabled()) {logger.info("Proxy-Client-IP - String ip=" + ip);}}if (ip == null || ip.trim().length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = request.getHeader("WL-Proxy-Client-IP");if (logger.isInfoEnabled()) {logger.info("WL-Proxy-Client-IP - String ip=" + ip);}}if (ip == null || ip.trim().length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = request.getHeader("HTTP_CLIENT_IP");if (logger.isInfoEnabled()) {logger.info("HTTP_CLIENT_IP - String ip=" + ip);}}if (ip == null || ip.trim().length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = request.getHeader("HTTP_X_FORWARDED_FOR");if (logger.isInfoEnabled()) {logger.info("HTTP_X_FORWARDED_FOR - String ip=" + ip);}}if (ip == null || ip.trim().length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = request.getRemoteAddr();if (logger.isInfoEnabled()) {logger.info("getRemoteAddr - String ip=" + ip);}}} else if (ip.trim().length() > 15) {//如果获取到多个IPString[] ips = ip.split(",");for (int index = 0; index < ips.length; index++) {String strIp = ips[index];if (ip != null && ip.trim().length() != 0 && !("unknown".equalsIgnoreCase(strIp))) {ip = strIp;break;}}}return ip;}
}