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In Java, how do I convert a byte array to a string of hex digits while keeping leading zeros? [duplicate] Ask Question

tag-icon • tag-icon java md5 hex
In Java, how do I convert a byte array to a string of hex digits while keeping leading zeros? [duplicate] Ask Question

I'm working with some example java code for making md5 hashes. One part converts the results from bytes to a string of hex digits:

byte messageDigest[] = algorithm.digest();     
StringBuffer hexString = new StringBuffer();
for (int i=0;i<messageDigest.length;i++) {
    hexString.append(Integer.toHexString(0xFF & messageDigest[i]));
    }

However, it doesn't quite work since toHexString apparently drops off leading zeros. So, what's the simplest way to go from byte array to hex string that maintains the leading zeros?

ベストアンサー1

Check out Hex.encodeHexString from Apache Commons Codec.

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

String hex = Hex.encodeHexString(bytes);

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