JAVA 获取Http请求中实际IP地址(解决获取多个IP问题)

lxhmall

于 2021-03-23 16:02:36 发布

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分类专栏： web 文章标签： http java

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本文详细介绍如何在Java应用中获取HttpServletRequest中的实际IP地址，针对常见的代理和头信息进行逐层排查，确保获取客户端的真实IP。

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JAVA 获取Http请求中实际IP地址

上代码：

 /**
  * 获取IP
  * @param request
  * @return
  */ 
public static String getIpAddress(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.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }

        if (ip != null) {
            //对于通过多个代理的情况，最后IP为客户端真实IP,多个IP按照','分割
            int position = ip.lastIndexOf(",");
            if (position > 0) {
                ip = ip.substring(position+1);
            }
        }
        return ip;
    }