Rinjae
71 lines
2.6 KiB
Java
71 lines
2.6 KiB
Java
package com.eactive.ext.kjb.ums;
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import java.math.BigInteger;
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import java.nio.ByteBuffer;
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import java.util.UUID;
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public class UUIDBase62Util {
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private static final String BASE62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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public static String uuidStringToBase62(String uuidStr) {
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UUID uuid = UUID.fromString(uuidStr);
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ByteBuffer bb = ByteBuffer.wrap(new byte[16]);
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bb.putLong(uuid.getMostSignificantBits());
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bb.putLong(uuid.getLeastSignificantBits());
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BigInteger bigInt = new BigInteger(1, bb.array());
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return toBase62(bigInt);
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}
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public static String base62ToUuidString(String base62Str) {
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BigInteger bigInt = fromBase62(base62Str);
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byte[] bytes = toByteArray(bigInt, 16);
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ByteBuffer bb = ByteBuffer.wrap(bytes);
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long msb = bb.getLong();
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long lsb = bb.getLong();
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return new UUID(msb, lsb).toString();
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}
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private static String toBase62(BigInteger value) {
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StringBuilder sb = new StringBuilder();
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while (value.compareTo(BigInteger.ZERO) > 0) {
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BigInteger[] divRem = value.divideAndRemainder(BigInteger.valueOf(62));
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sb.append(BASE62.charAt(divRem[1].intValue()));
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value = divRem[0];
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}
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// pad to 22 chars for consistent length
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while (sb.length() < 22) sb.append('0');
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return sb.reverse().toString();
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}
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private static BigInteger fromBase62(String base62) {
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BigInteger result = BigInteger.ZERO;
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for (char c : base62.toCharArray()) {
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int digit = BASE62.indexOf(c);
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if (digit == -1) throw new IllegalArgumentException("Invalid Base62 character: " + c);
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result = result.multiply(BigInteger.valueOf(62)).add(BigInteger.valueOf(digit));
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}
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return result;
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}
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private static byte[] toByteArray(BigInteger bigInt, int size) {
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byte[] src = bigInt.toByteArray();
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byte[] dst = new byte[size];
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int srcPos = Math.max(0, src.length - size);
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int dstPos = Math.max(0, size - src.length);
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int length = Math.min(size, src.length);
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System.arraycopy(src, srcPos, dst, dstPos, length);
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return dst;
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}
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public static void main(String[] args) {
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String uuid = UUID.randomUUID().toString();
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String base62 = uuidStringToBase62(uuid);
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String decoded = base62ToUuidString(base62);
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System.out.println("UUID : " + uuid);
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System.out.println("Base62: " + base62 + " (" + base62.length() + ")");
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System.out.println("Decoded: " + decoded);
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System.out.println("Same? " + uuid.equals(decoded));
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}
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}
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