Package org.apache.juneau.commons.utils

Class ChecksumUtils

java.lang.Object

org.apache.juneau.commons.utils.ChecksumUtils

public class ChecksumUtils
extends Object

Content-checksum utility methods.

Method Summary

Modifier and Type	Method	Description
static String	hash8(byte[] bytes)	Formats a CRC32 checksum of the specified bytes as a zero-padded, lower-case, 8-hex-char content hash.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

hash8

public static String hash8(byte[] bytes)

Formats a CRC32 checksum of the specified bytes as a zero-padded, lower-case, 8-hex-char content hash.

Suitable as a compact, content-sensitive cache-buster for classpath-shipped assets (JS/CSS/images, etc.): the hash changes the instant the underlying bytes do, without relying on a build/version string alone (which stays stable across -SNAPSHOT dev rebuilds and so cannot bust a browser's cache on its own).

Parameters:

bytes - The bytes to checksum. Must not be null.

Returns:

The zero-padded 8-hex-char CRC32 checksum (e.g. "1a2b3c4d").