java IPV6、IPV4地址与BigInteger互相转化 博客分类: java
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2024-03-23 12:02:28
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由于项目的需要,需要把 IPV6、IPV4地址转化为BigInteger,也需要将BigInteger转化为 IPV6、IPV4地址。于是上网查找资料。发现网上有一个IpConvert类:于是拷贝下来在项目中应用。
IpConvert的源码如下:
import java.math.BigInteger; import java.net.InetAddress; import java.net.UnknownHostException; import java.util.Arrays; /** * IP转换工具 * * @author Takamachi660 * */ public final class IpConvert { /** * 防止被实例化 */ private IpConvert() { } /** * 将字符串形式的ip地址转换为BigInteger * * @param ipInString * 字符串形式的ip地址 * @return 整数形式的ip地址 */ public static BigInteger stringToBigInt(String ipInString) { ipInString = ipInString.replace(" ", ""); byte[] bytes; if (ipInString.contains(":")) bytes = ipv6ToBytes(ipInString); else bytes = ipv4ToBytes(ipInString); return new BigInteger(bytes); } /** * 将整数形式的ip地址转换为字符串形式 * * @param ipInBigInt * 整数形式的ip地址 * @return 字符串形式的ip地址 */ public static String bigIntToString(BigInteger ipInBigInt) { byte[] bytes = ipInBigInt.toByteArray(); byte[] unsignedBytes = Arrays.copyOfRange(bytes, 1, bytes.length); // 去除符号位 try { String ip = InetAddress.getByAddress(unsignedBytes).toString(); return ip.substring(ip.indexOf('/') + 1).trim(); } catch (UnknownHostException e) { throw new RuntimeException(e); } } /** * ipv6地址转有符号byte[17] */ private static byte[] ipv6ToBytes(String ipv6) { byte[] ret = new byte[17]; ret[0] = 0; int ib = 16; boolean comFlag = false;// ipv4混合模式标记 if (ipv6.startsWith(":"))// 去掉开头的冒号 ipv6 = ipv6.substring(1); String groups[] = ipv6.split(":"); for (int ig = groups.length - 1; ig > -1; ig--) {// 反向扫描 if (groups[ig].contains(".")) { // 出现ipv4混合模式 byte[] temp = ipv4ToBytes(groups[ig]); ret[ib--] = temp[4]; ret[ib--] = temp[3]; ret[ib--] = temp[2]; ret[ib--] = temp[1]; comFlag = true; } else if ("".equals(groups[ig])) { // 出现零长度压缩,计算缺少的组数 int zlg = 9 - (groups.length + (comFlag ? 1 : 0)); while (zlg-- > 0) {// 将这些组置0 ret[ib--] = 0; ret[ib--] = 0; } } else { int temp = Integer.parseInt(groups[ig], 16); ret[ib--] = (byte) temp; ret[ib--] = (byte) (temp >> 8); } } return ret; } /** * ipv4地址转有符号byte[5] */ private static byte[] ipv4ToBytes(String ipv4) { byte[] ret = new byte[5]; ret[0] = 0; // 先找到IP地址字符串中.的位置 int position1 = ipv4.indexOf("."); int position2 = ipv4.indexOf(".", position1 + 1); int position3 = ipv4.indexOf(".", position2 + 1); // 将每个.之间的字符串转换成整型 ret[1] = (byte) Integer.parseInt(ipv4.substring(0, position1)); ret[2] = (byte) Integer.parseInt(ipv4.substring(position1 + 1, position2)); ret[3] = (byte) Integer.parseInt(ipv4.substring(position2 + 1, position3)); ret[4] = (byte) Integer.parseInt(ipv4.substring(position3 + 1)); return ret; } public static void main(String[] args) { System.out.println(stringToBigInt("10.36.65.22")); System.out.println(bigIntToString(stringToBigInt("10.36.65.22"))); } }
但是,在测试的时候发现10段的ip地址的BigInteger 形式无法转为字符串,经过一番测试将程序改造如下:
import java.math.BigInteger; import java.net.InetAddress; import java.net.UnknownHostException; import java.util.Arrays; /** * IP转换工具 * * @author Takamachi660 * */ public final class IpConvert { /** * 防止被实例化 */ private IpConvert() { } /** * 将字符串形式的ip地址转换为BigInteger * * @param ipInString * 字符串形式的ip地址 * @return 整数形式的ip地址 */ public static BigInteger stringToBigInt(String ipInString) { ipInString = ipInString.replace(" ", ""); byte[] bytes; if (ipInString.contains(":")) bytes = ipv6ToBytes(ipInString); else bytes = ipv4ToBytes(ipInString); return new BigInteger(bytes); } /** * 将整数形式的ip地址转换为字符串形式 * * @param ipInBigInt * 整数形式的ip地址 * @return 字符串形式的ip地址 */ public static String bigIntToString(BigInteger ipInBigInt) { byte[] bytes = ipInBigInt.toByteArray(); byte[] unsignedBytes = Arrays.copyOfRange(bytes, 1, bytes.length); if (bytes.length == 4 || bytes.length == 16) { unsignedBytes = bytes; } // 去除符号位 try { String ip = InetAddress.getByAddress(unsignedBytes).toString(); return ip.substring(ip.indexOf('/') + 1).trim(); } catch (UnknownHostException e) { throw new RuntimeException(e); } } /** * ipv6地址转有符号byte[17] */ private static byte[] ipv6ToBytes(String ipv6) { byte[] ret = new byte[17]; ret[0] = 0; int ib = 16; boolean comFlag = false;// ipv4混合模式标记 if (ipv6.startsWith(":"))// 去掉开头的冒号 ipv6 = ipv6.substring(1); String groups[] = ipv6.split(":"); for (int ig = groups.length - 1; ig > -1; ig--) {// 反向扫描 if (groups[ig].contains(".")) { // 出现ipv4混合模式 byte[] temp = ipv4ToBytes(groups[ig]); ret[ib--] = temp[4]; ret[ib--] = temp[3]; ret[ib--] = temp[2]; ret[ib--] = temp[1]; comFlag = true; } else if ("".equals(groups[ig])) { // 出现零长度压缩,计算缺少的组数 int zlg = 9 - (groups.length + (comFlag ? 1 : 0)); while (zlg-- > 0) {// 将这些组置0 ret[ib--] = 0; ret[ib--] = 0; } } else { int temp = Integer.parseInt(groups[ig], 16); ret[ib--] = (byte) temp; ret[ib--] = (byte) (temp >> 8); } } return ret; } /** * ipv4地址转有符号byte[5] */ private static byte[] ipv4ToBytes(String ipv4) { byte[] ret = new byte[5]; ret[0] = 0; // 先找到IP地址字符串中.的位置 int position1 = ipv4.indexOf("."); int position2 = ipv4.indexOf(".", position1 + 1); int position3 = ipv4.indexOf(".", position2 + 1); // 将每个.之间的字符串转换成整型 ret[1] = (byte) Integer.parseInt(ipv4.substring(0, position1)); ret[2] = (byte) Integer.parseInt(ipv4.substring(position1 + 1, position2)); ret[3] = (byte) Integer.parseInt(ipv4.substring(position2 + 1, position3)); ret[4] = (byte) Integer.parseInt(ipv4.substring(position3 + 1)); return ret; } public static void main(String[] args) { System.out.println(stringToBigInt("10.36.65.22")); System.out.println(bigIntToString(stringToBigInt("10.36.65.22"))); System.out.println(stringToBigInt("fe80::8984:de33:85aa:5b81")); System.out.println(bigIntToString(new BigInteger( "338288524927261089663928186234336861057"))); } }
改造以后,能够适用于10段、172段、192段、127段等绝大多数的BigInteger 形式转为字符串。其中以下代码是我增加的:
if (bytes.length == 4 || bytes.length == 16) {
unsignedBytes = bytes;
}