获取IP的通用方法

public static String getIPAddress(HttpServletRequest request) {
        String ip = null;

        //X-Forwarded-For：Squid 服务代理
        String ipAddresses = request.getHeader("X-Forwarded-For");

        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            //Proxy-Client-IP：apache 服务代理
            ipAddresses = request.getHeader("Proxy-Client-IP");
        }

        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            //WL-Proxy-Client-IP：weblogic 服务代理
            ipAddresses = request.getHeader("WL-Proxy-Client-IP");
        }

        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            //HTTP_CLIENT_IP：有些代理服务器
            ipAddresses = request.getHeader("HTTP_CLIENT_IP");
        }

        if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            //X-Real-IP：nginx服务代理
            ipAddresses = request.getHeader("X-Real-IP");
        }

        //有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
        if (ipAddresses != null && ipAddresses.length() != 0) {
            ip = ipAddresses.split(",")[0];
        }

        //还是不能获取到，最后再通过request.getRemoteAddr();获取
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

public static String getIPAddress(HttpServletRequest request) {
    String ip = null;

//X-Forwarded-For：Squid 服务代理
String ipAddresses = request.getHeader("X-Forwarded-For");

    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        //Proxy-Client-IP：apache 服务代理
ipAddresses = request.getHeader("Proxy-Client-IP");
}

    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        //WL-Proxy-Client-IP：weblogic 服务代理
ipAddresses = request.getHeader("WL-Proxy-Client-IP");
}

    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        //HTTP_CLIENT_IP：有些代理服务器
ipAddresses = request.getHeader("HTTP_CLIENT_IP");
}

    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        //X-Real-IP：nginx服务代理
ipAddresses = request.getHeader("X-Real-IP");
}

    //有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
if (ipAddresses != null && ipAddresses.length() != 0) {
        ip = ipAddresses.split(",")[0];
}

    //还是不能获取到，最后再通过request.getRemoteAddr();获取
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        ip = request.getRemoteAddr();
}
    return ip;
}

标签：通用,ip,request,获取,length,ipAddresses,IP,null
来源： https://www.cnblogs.com/recorderM/p/15974297.html