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synced 2025-05-09 23:51:34 +08:00
update code;
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emptypoint
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@ -130,6 +130,12 @@ public class Ipv4Util {
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* @return 子网所有ip地址
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*/
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public static List<String> list(final String ip, final int maskBit, final boolean isAll) {
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assertMaskBitValid(maskBit);
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// 避免后续的计算异常
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if (countByMaskBit(maskBit, isAll) == 0) {
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return new ArrayList<>(0);
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}
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if (maskBit == IP_MASK_MAX) {
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final List<String> list = new ArrayList<>();
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if (isAll) {
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@ -144,6 +150,7 @@ public class Ipv4Util {
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return list(startIp, endIp);
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}
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// 可用地址，排除开始和结束的地址
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int lastDotIndex = startIp.lastIndexOf(CharUtil.DOT) + 1;
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startIp = StrUtil.subPre(startIp, lastDotIndex) +
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(Integer.parseInt(Objects.requireNonNull(StrUtil.subSuf(startIp, lastDotIndex))) + 1);
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@ -207,17 +214,12 @@ public class Ipv4Util {
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* @return 点分十进制ip地址
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*/
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public static String longToIpv4(final long longIp) {
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final StringBuilder sb = StrUtil.builder();
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// 直接右移24位
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sb.append(longIp >> 24 & 0xFF);
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sb.append(CharUtil.DOT);
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// 将高8位置0，然后右移16位
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sb.append(longIp >> 16 & 0xFF);
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sb.append(CharUtil.DOT);
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sb.append(longIp >> 8 & 0xFF);
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sb.append(CharUtil.DOT);
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sb.append(longIp & 0xFF);
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return sb.toString();
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return StrUtil.builder(15)
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.append(getPartOfIpLong(longIp, 1)).append(CharUtil.DOT)
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.append(getPartOfIpLong(longIp, 2)).append(CharUtil.DOT)
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.append(getPartOfIpLong(longIp, 3)).append(CharUtil.DOT)
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.append(getPartOfIpLong(longIp, 4))
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.toString();
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}
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/**
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@ -229,11 +231,9 @@ public class Ipv4Util {
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*/
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public static long ipv4ToLong(final String strIp) {
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final Matcher matcher = PatternPool.IPV4.matcher(strIp);
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if (matcher.matches()) {
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Assert.isTrue(matcher.matches(), "Invalid IPv4 address: {}", strIp);
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return matchAddress(matcher);
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}
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throw new IllegalArgumentException("Invalid IPv4 address!");
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}
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/**
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* 根据 ip 和 掩码位 获取 子网的起始IP（字符串型）
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@ -255,6 +255,7 @@ public class Ipv4Util {
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* @return 起始IP的长整型表示
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*/
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public static Long getBeginIpLong(final String ip, final int maskBit) {
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assertMaskBitValid(maskBit);
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return ipv4ToLong(ip) & ipv4ToLong(getMaskByMaskBit(maskBit));
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}
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@ -289,9 +290,7 @@ public class Ipv4Util {
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*/
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public static int getMaskBitByMask(final String mask) {
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final Integer maskBit = MaskBit.getMaskBit(mask);
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if (maskBit == null) {
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throw new IllegalArgumentException("Invalid netmask " + mask);
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}
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Assert.notNull(maskBit, "Invalid netmask：{}", mask);
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return maskBit;
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}
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@ -303,12 +302,13 @@ public class Ipv4Util {
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* @return 子网内地址总数
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*/
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public static int countByMaskBit(final int maskBit, final boolean isAll) {
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//如果是可用地址的情况，掩码位小于等于0或大于等于32，则可用地址为0
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if ((false == isAll) && (maskBit <= 0 || maskBit >= 32)) {
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assertMaskBitValid(maskBit);
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//如果掩码位等于32，则可用地址为0
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if (maskBit == 32 && false == isAll) {
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return 0;
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}
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final int count = (int) Math.pow(2, 32 - maskBit);
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final int count = 1 << (32 - maskBit);
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return isAll ? count : count - 2;
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}
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@ -332,15 +332,14 @@ public class Ipv4Util {
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public static String getMaskByIpRange(final String fromIp, final String toIp) {
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final long toIpLong = ipv4ToLong(toIp);
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final long fromIpLong = ipv4ToLong(fromIp);
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Assert.isTrue(fromIpLong < toIpLong, "to IP must be greater than from IP!");
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Assert.isTrue(fromIpLong <= toIpLong, "Start IP must be less than or equal to end IP!");
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final String[] fromIpSplit = StrUtil.splitToArray(fromIp, CharUtil.DOT);
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final String[] toIpSplit = StrUtil.splitToArray(toIp, CharUtil.DOT);
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final StringBuilder mask = new StringBuilder();
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for (int i = 0; i < toIpSplit.length; i++) {
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mask.append(255 - Integer.parseInt(toIpSplit[i]) + Integer.parseInt(fromIpSplit[i])).append(CharUtil.DOT);
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}
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return mask.substring(0, mask.length() - 1);
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return StrUtil.builder(15)
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.append(255 - getPartOfIpLong(toIpLong, 1) + getPartOfIpLong(fromIpLong, 1)).append(CharUtil.DOT)
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.append(255 - getPartOfIpLong(toIpLong, 2) + getPartOfIpLong(fromIpLong, 2)).append(CharUtil.DOT)
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.append(255 - getPartOfIpLong(toIpLong, 3) + getPartOfIpLong(fromIpLong, 3)).append(CharUtil.DOT)
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.append(255 - getPartOfIpLong(toIpLong, 4) + getPartOfIpLong(fromIpLong, 4))
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.toString();
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}
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/**
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@ -353,15 +352,13 @@ public class Ipv4Util {
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public static int countByIpRange(final String fromIp, final String toIp) {
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final long toIpLong = ipv4ToLong(toIp);
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final long fromIpLong = ipv4ToLong(fromIp);
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if (fromIpLong > toIpLong) {
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throw new IllegalArgumentException("to IP must be greater than from IP!");
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}
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Assert.isTrue(fromIpLong <= toIpLong, "Start IP must be less than or equal to end IP!");
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int count = 1;
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final int[] fromIpSplit = StrUtil.split(fromIp, CharUtil.DOT).stream().mapToInt(Integer::parseInt).toArray();
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final int[] toIpSplit = StrUtil.split(toIp, CharUtil.DOT).stream().mapToInt(Integer::parseInt).toArray();
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for (int i = fromIpSplit.length - 1; i >= 0; i--) {
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count += (toIpSplit[i] - fromIpSplit[i]) * Math.pow(256, fromIpSplit.length - i - 1);
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}
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count += (getPartOfIpLong(toIpLong, 4) - getPartOfIpLong(fromIpLong, 4));
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count += (getPartOfIpLong(toIpLong, 3) - getPartOfIpLong(fromIpLong, 3)) << 8;
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count += (getPartOfIpLong(toIpLong, 2) - getPartOfIpLong(fromIpLong, 2)) << 16;
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count += (getPartOfIpLong(toIpLong, 1) - getPartOfIpLong(fromIpLong, 1)) << 24;
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return count;
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}
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@ -382,7 +379,7 @@ public class Ipv4Util {
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* @return true：掩码位合法；false：掩码位不合法
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*/
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public static boolean isMaskBitValid(final int maskBit) {
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return MaskBit.get(maskBit) != null;
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return maskBit >= IP_MASK_MIN && maskBit <= IP_MASK_MAX;
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}
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/**
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@ -416,9 +413,15 @@ public class Ipv4Util {
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* @return ip的long值
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*/
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private static long matchAddress(final Matcher matcher) {
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long addr = 0;
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int addr = 0;
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// 每个点分十进制数字 转为 8位二进制
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for (int i = 1; i <= 4; ++i) {
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addr |= Long.parseLong(matcher.group(i)) << 8 * (4 - i);
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addr <<= 8;
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addr |= Integer.parseInt(matcher.group(i));
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}
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// int的最高位无法直接使用，转为Long
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if (addr < 0) {
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return 0xffffffffL & addr;
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}
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return addr;
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}
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@ -434,5 +437,44 @@ public class Ipv4Util {
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private static boolean isBetween(final long userIp, final long begin, final long end) {
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return (userIp >= begin) && (userIp <= end);
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}
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/**
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* 校验 掩码位数，合法范围为：[1,32]，不合法则抛出异常
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*
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* @param maskBit 掩码位数
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*/
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private static void assertMaskBitValid(final int maskBit) {
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Assert.isTrue(isMaskBitValid(maskBit), "Invalid maskBit：{}", maskBit);
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}
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/**
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* 获取ip(Long类型)指定部分的十进制值，即，{@literal X.X.X.X }形式中每个部分的值
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* <p>例如，ip为{@literal 0xC0A802FA}，第1部分的值为：
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* <ul>
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* <li>第1部分的值为：@literal 0xC0}，十进制值为：192</li>
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* <li>第2部分的值为：@literal 0xA8}，十进制值为：168</li>
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* <li>第3部分的值为：@literal 0x02}，十进制值为：2</li>
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* <li>第4部分的值为：@literal 0xFA}，十进制值为：250</li>
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* </ul>
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* </p>
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*
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* @param ip ip地址，Long类型
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* @param position 指定位置，取值范围：[1,4]
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* @return ip地址指定部分的十进制值
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*/
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private static int getPartOfIpLong(final long ip, final int position) {
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switch (position) {
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case 1:
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return ((int) ip >> 24) & 0xFF;
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case 2:
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return ((int) ip >> 16) & 0xFF;
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case 3:
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return ((int) ip >> 8) & 0xFF;
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case 4:
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return ((int) ip) & 0xFF;
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default:
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throw new IllegalArgumentException("Illegal position of ip Long: " + position);
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}
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}
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//-------------------------------------------------------------------------------- Private method end
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}
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