How Can I Maintain Leading Zeros When Converting a Java Byte Array to a Hex String?

Maintaining Leading Zeros in Hex Conversion of Byte Array in Java

In Java, when converting a byte array to a string of hexadecimal digits, it's important to preserve leading zeros for accuracy. The Integer.toHexString() method, commonly used for conversion, tends to omit leading zeros. This can introduce ambiguity in data representation.

Solution Using Apache Commons Codec

One solution is to employ the Apache Commons Codec library. Its Hex class provides a straightforward method, encodeHexString, which effectively converts a byte array to a hex string while preserving leading zeros.

import org.apache.commons.codec.binary.Hex;

byte[] bytes = ...;
String hexString = Hex.encodeHexString(bytes);

In this approach, the byte array 'bytes' is passed to encodeHexString. The resulting hexString contains the hex representation of each byte, with leading zeros maintained for each pair of digits, ensuring accuracy and clarity.

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