public class IPUtils {    /***     * 校验IP段是否一致     * IP段的前三部分必须一直, 比如222.72.45.0-222.72.45.255, 不能是222.72.45.0 - 110.72.45.255     * @param startSection     * @param endSection     * @return     */    public static boolean verifyIPSectionMeet(String startSection, String endSection){        boolean startIpMeet = verifyIPMeet(startSection);        if (!startIpMeet){            throw new YDIllegalArgumentException("开始段IP不合法。");        }        boolean endIpMeet = verifyIPMeet(endSection);        if (!endIpMeet){            throw new YDIllegalArgumentException("结束段IP不合法。");        }        if (startIpMeet && endIpMeet){            String startIpPrefix = startSection.substring(0, startSection.lastIndexOf(".") + 1);            String endIpPrefix = endSection.substring(0, startSection.lastIndexOf(".") + 1);            if (startIpPrefix.equals(endIpPrefix)){                return true;            }        }        return false;    }        /***     * 校验IP是否合法     * @param ip     * @return     */    public static boolean verifyIPMeet(String ip){        YDAssert.isNotNull(ip, "IP不能为空。");         // 定义正则表达式        String regex = "^(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|[1-9])\\."                + "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\."                + "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\."                + "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)$";        // 判断ip地址是否与正则表达式匹配        if (ip.matches(regex)) {            // 返回判断信息            return true;        }        return false;    }}