java获取当前机器的公网ip

package com.Interface.util;  import javax.servlet.http.HttpServletRequest;  /**  * 测试类  *   * @author 华文  * @date 2019年7月5日  * @version 1.0  */ public class Test {      /**      * 获取当前公网ip      */     public static String getIpAddr(HttpServletRequest request) {         String ip = request.getHeader("x-forwarded-for");         if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {             // 多次反向代理后会有多个ip值，第一个ip才是真实ip             if (ip.indexOf(",") != -1) {                 ip = ip.split(",")[0];             }         }         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {             ip = request.getHeader("Proxy-Client-IP");             System.out.println("Proxy-Client-IP ip: " + ip);         }         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {             ip = request.getHeader("WL-Proxy-Client-IP");             System.out.println("WL-Proxy-Client-IP ip: " + ip);         }         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {             ip = request.getHeader("HTTP_CLIENT_IP");             System.out.println("HTTP_CLIENT_IP ip: " + ip);         }         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {             ip = request.getHeader("HTTP_X_FORWARDED_FOR");             System.out.println("HTTP_X_FORWARDED_FOR ip: " + ip);         }         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {             ip = request.getHeader("X-Real-IP");             System.out.println("X-Real-IP ip: " + ip);         }         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {             ip = request.getRemoteAddr();             System.out.println("getRemoteAddr ip: " + ip);         }         return ip;     } }