java从HttpServletRequest中获取请求IP地址

心之伊始

于 2019-12-18 15:47:01 发布

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分类专栏： java 文章标签：获取请求客户端IP

本文链接：https://blog.youkuaiyun.com/xinzhiyishi/article/details/103599100

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本文介绍了两种从HttpServletRequest中获取客户端真实IP地址的方法。第一种方法通过检查多个请求头来确定IP，包括'x-forwarded-for'、'Proxy-Client-IP'和'WL-Proxy-Client-IP'，如果这些头不存在或为'unknown'，则使用'remoteAddr'。第二种方法简化了这一过程，直接返回'x-forwarded-for'头或'remoteAddr'。

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public static String getRealIp(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;
}

public static String getRealIpV2(HttpServletRequest request) {
    String accessIp= request.getHeader("x-forwarded-for");
    return null == accessIp ? request.getRemoteAddr() : accessIp;
}