package com.fr.plugin;

import javax.servlet.http.HttpServletRequest;

public class IpUtils {
    /**
     * 将字符串形式IP地址127.0.0.1转换10234564321
     *
     * @param strIP
     * @return
     */
    public static long ip2Long(String strIP) {
        long[] ip = new long[4];
// 先找到IP地址字符串中.的位置
        int position1 = strIP.indexOf(".");
        int position2 = strIP.indexOf(".", position1 + 1);
        int position3 = strIP.indexOf(".", position2 + 1);
// 将每个.之间的字符串转换成整型
        ip[0] = Long.parseLong(strIP.substring(0, position1));
        ip[1] = Long.parseLong(strIP.substring(position1 + 1, position2));
        ip[2] = Long.parseLong(strIP.substring(position2 + 1, position3));
        ip[3] = Long.parseLong(strIP.substring(position3 + 1));
        return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];
    }

    public static String getIp(HttpServletRequest request) {
        String remoteIp = request.getRemoteAddr();

        // 多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if (remoteIp != null && remoteIp.length() > 15) {
            if (remoteIp.indexOf(",") > 0) {
                remoteIp = remoteIp.substring(0, remoteIp.indexOf(","));
            }
        }
        return remoteIp;
    }

    /**
     *  将字符串形式IP地址转换long类型
     * @param ip
     * @return
     */
    public static long getIp2long(String ip) {
        ip = ip.trim();
        String[] ips = ip.split("\\.");
        long ip1 = Integer.parseInt(ips[0]);
        long ip2 = Integer.parseInt(ips[1]);
        long ip3 = Integer.parseInt(ips[2]);
        long ip4 = Integer.parseInt(ips[3]);
        return ip1 * 256 * 256 * 256 + ip2 * 256 * 256 + ip3 * 256 + ip4;
    }
    /**
     * 判断一个ip地址是否在某个ip段范围内
     * @param ip
     * @param startIP
     * @param endIP
     * @return
     */
    public static boolean ipExistsInRange(String ip, String startIP, String endIP) {
        return (getIp2long(startIP)<=getIp2long(ip)) && (getIp2long(ip)<=getIp2long(endIP));
    }
}