java-diff-utils

Automatically exported from code.google.com/p/java-diff-utils

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Diff Utils library is an OpenSource library for performing the comparison operations between texts: computing diffs, applying patches, generating unified diffs or parsing them, generating diff output for easy future displaying (like side-by-side view) and so on.

Main reason to build this library was the lack of easy-to-use libraries with all the usual stuff you need while working with diff files. Originally it was inspired by JRCS library and it's nice design of diff module. Main Features

computing the difference between two texts.
capable to hand more than plain ascci. Arrays or List of any type that implements hashCode() and equals() correctly can be subject to differencing using this library
patch and unpatch the text with the given patch
parsing the unified diff format
producing human-readable differences 

Algoritms

This library implements Myer's diff algorithm. But it can easily replaced by any other which is better for handing your texts. I have plan to add implementation of some in future. Changelog

Version 1.2
    JDK 1.5 compatibility
    Ant build script
    Generate output in unified diff format (thanks for Bill James) 

To Install

Just add the code below to your maven dependencies:

com.googlecode.java-diff-utils com.github.sleroy.diffutils 1.2.1

And for Ivy:

Coming eventually

support for inline diffs in output
helpers for showing side-by-side, line-by-line diffs or text with inter-line and intra-line change highlights
customization of diff algorithm for better experience while computing diffs between strings (ignoring blank lines or spaces, etc)
generating output in other formats (not only unified). E.g. CVS. 

Tutorials

http://www.adictosaltrabajo.com/tutoriales/tutoriales.php?pagina=CompararFicherosJavaDiffUtils (in Spanish). Thanks Miguel