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回 1楼漫步沙漠的帖子 Java代码获取X-Forwarded-For /** * 获取ip地址,防止集群、代理 * @param request   * @return ip */   public static String getAddr(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;   }