JSP 获得客户端正式IP地址（非代理服务器）

最新推荐文章于 2018-09-20 16:58:00 发布

原创最新推荐文章于 2018-09-20 16:58:00 发布 · 3k 阅读

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本文介绍了一种通过Java代码从HttpServletRequest对象中获取客户端真实IP地址的方法。该方法依次尝试从不同的HTTP头部字段获取IP信息，如果这些头部字段都不存在或者为'unknown'，则使用request.getRemoteAddr()来获取。

    public static String getIpAddr(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();
        }
        return ip;
    }