NetUtil.bigIntegerToIPv6增加长度修正

hutool-core/src/main/java/org/dromara/hutool/core/net/Ipv6Util.java

@@ -60,10 +60,30 @@ public class Ipv6Util {
 	 * @return IPv6字符串, 如发生异常返回 null
 	 */
 	public static String bigIntegerToIPv6(final BigInteger bigInteger) {
+		// 确保 BigInteger 在 IPv6 地址范围内
+		if (bigInteger.compareTo(BigInteger.ZERO) < 0 || bigInteger.compareTo(new BigInteger("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", 16)) > 0) {
+			throw new IllegalArgumentException("BigInteger value is out of IPv6 range");
+		}
+
+		// 将 BigInteger 转换为 16 字节的字节数组
+		byte[] bytes = bigInteger.toByteArray();
+		if (bytes.length > 16) {
+			// 如果字节数组长度大于 16，去掉前导零
+			final int offset = bytes[0] == 0 ? 1 : 0;
+			final byte[] newBytes = new byte[16];
+			System.arraycopy(bytes, offset, newBytes, 0, 16);
+			bytes = newBytes;
+		} else if (bytes.length < 16) {
+			// 如果字节数组长度小于 16，前面补零
+			final byte[] paddedBytes = new byte[16];
+			System.arraycopy(bytes, 0, paddedBytes, 16 - bytes.length, bytes.length);
+			bytes = paddedBytes;
+		}
+
+		// 将字节数组转换为 IPv6 地址字符串
 		try {
-			return InetAddress.getByAddress(
+			return Inet6Address.getByAddress(bytes).getHostAddress();
-				bigInteger.toByteArray()).toString().substring(1);
+		} catch (final UnknownHostException e) {
-		} catch (final UnknownHostException ignore) {
 			return null;
 		}
 	}

hutool-core/src/test/java/org/dromara/hutool/core/net/Ipv6UtilTest.java

@@ -0,0 +1,15 @@
+package org.dromara.hutool.core.net;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.math.BigInteger;
+
+public class Ipv6UtilTest {
+	@Test
+	void bigIntegerToIPv6Test() {
+		final BigInteger bigInteger = new BigInteger("21987654321098765432109876543210", 10);
+		final String ipv6Address = Ipv6Util.bigIntegerToIPv6(bigInteger);
+		Assertions.assertEquals("0:115:85f1:5eb3:c74d:a870:11c6:7eea", ipv6Address);
+	}
+}