Jgit 提取出两个版本之间的差异文件和方法

你可以使用 JGit 的 DiffCommand 类来提取出两个版本之间的差异文件和方法。

以下是一个示例代码，假设你要比较的两个版本是 commit1 和 commit2：

Git git = new Git(repository);

ObjectId oldCommitId = repository.resolve("commit1");
ObjectId newCommitId = repository.resolve("commit2");

DiffCommand diffCommand = git.diff()
        .setOldTree(prepareTreeParser(repository, oldCommitId))
        .setNewTree(prepareTreeParser(repository, newCommitId));

List<DiffEntry> diffEntries = diffCommand.call();

for (DiffEntry entry : diffEntries) {
    // 输出差异文件的路径
    System.out.println("Changed file: " + entry.getNewPath());

    // 输出差异内容
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    DiffFormatter formatter = new DiffFormatter(out);
    formatter.setRepository(repository);
    formatter.format(entry);
    System.out.println(out.toString("UTF-8"));
}

private static AbstractTreeIterator prepareTreeParser(Repository repository, AnyObjectId objectId) throws IOException {
    // 从 Git 中读取一个对象
    RevWalk walk = new RevWalk(repository);
    RevCommit commit = walk.parseCommit(objectId);
    RevTree tree = walk.parseTree(commit.getTree().getId());

    CanonicalTreeParser treeParser = new CanonicalTreeParser();
    try (ObjectReader reader = repository.newObjectReader()) {
        treeParser.reset(reader, tree.getId());
    }

    walk.dispose();

    return treeParser;
}

这段代码将会输出差异文件的路径和差异内容。你可以根据需要修改输出格式和内容。