How to Convert Byte Arrays to Hex Strings with Leading Zeros in Java?

Converting Byte Arrays to Hex Strings with Leading Zeros in Java

When working with MD5 hashes, one common task is converting byte arrays into strings of hexadecimal digits. A simple method involves using Integer.toHexString to append each byte's hexadecimal representation to a StringBuffer. However, this approach often discards leading zeros.

To address this issue, consider utilizing the Hex.encodeHexString method from Apache Commons Codec. Here's how:

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

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

This method provides the following advantages:

• It directly converts byte arrays to hexadecimal notation, eliminating the need for manual looping and string manipulation.
• It preserves leading zeros in the hex string representation.

By leveraging Hex.encodeHexString, you can effortlessly convert byte arrays to hex strings with maintained leading zeros, simplifying your MD5 hashing operations.

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