How to Preserve Leading Zeros When Converting a Byte Array to a Hex String in Java?

Maintaining Leading Zeros During Byte Array to Hex String Conversion in Java

To preserve leading zeros when converting a byte array to a hex string, an alternative approach is recommended. The Java platform offers limited options for this specific conversion, as demonstrated in the code snippet you provided. However, utilizing third-party libraries can provide additional flexibility and functionality.

A versatile and efficient solution is available from Apache Commons Codec. Its Hex.encodeHexString method takes a byte array as input and generates the corresponding hexadecimal representation while retaining leading zeros. Here's how to implement it:

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

String hexString = Hex.encodeHexString(byteArrayOfMessageDigest);

This method effectively addresses your requirement by ensuring that leading zeros are maintained during the conversion process.

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