Parse unified diffs with Java.
DiffParser parser = new UnifiedDiffParser();
InputStream in = new FileInputStream("/path/to/file.diff");
List<Diff> diff = parser.parse(in);
<dependency>
<groupId>org.wickedsource</groupId>
<artifactId>diffparser</artifactId>
<version>1.1</version>
</dependency>
If you do not use Maven as build tool, you can download the JAR at a public Maven repository like http://mvnrepository.com/.
Currently, the only implementation of the DiffParser interface is UnifiedDiffParser, which supports parsing of diffs like the following:
Modified: trunk/test1.txt
===================================================================
--- /trunk/test1.txt 2013年10月23日 19:41:56 UTC (rev 46)
+++ /trunk/test1.txt 2013年10月23日 19:44:39 UTC (rev 47)
@@ -1,4 +1,3 @@
test1
-test1
+test234
-test1
\ No newline at end of file
@@ -5,9 +6,10 @@
-test1
-test1
+aösdhasd
+asdasd
An input stream may contain several sections like the above, delimited by an empty line. Each such section will be parsed into an object of class Diff.