如何使用 jGit 克隆单个文件？

Question

我正在使用 Java 中的 jGit，并且我设法克隆了整个存储库。但是我找不到在存储库中下载单个文件的方法。我试过了：

• 更改指定文件路径的 URL。
• 通过指定子目录更改 URL。

他们都没有工作。

我的代码（克隆整个仓库）如下：

public File cloneRepository(String url, String path) throws GitAPIException {

    File download = new File (path);
    if (download.exists()){
        System.out.println("Error");
        return null;
    }
    else{
        CloneCommand clone = Git.cloneRepository()      
                .setURI(url)
                .setDirectory(download);
        try (Git repositorio = clone.call()) {
            return repositorio.getRepository().getWorkTree();
        }
    }
}

如何更改为下载单个文件？

Answer 1

您只需要遍历文件树即可找到您需要的文件 这是一个代码示例

// Clone remote repository
CloneCommand cloneCommand = Git.cloneRepository();
cloneCommand.setDirectory(localRepository.toFile());
cloneCommand.setBare(false);
cloneCommand.setURI(remoteRepository.toString());
cloneCommand.setTransportConfigCallback(transportConfigCallback);
Repository repository = cloneCommand.call().getRepository();
ObjectId ref = repository.resolve("your commit or branch");
// Resolve commit hash
RevWalk revWalk = new RevWalk(repository);
RevCommit revCommit = revWalk.parseCommit(ref);
Commit commit = new Commit(revCommit);
TreeWalk tree = new TreeWalk(repository);
tree.addTree(revCommit.getTree());
tree.setRecursive(true);
// Set path filter, to show files on matching path
tree.setFilter(PathFilter.create("path to file"));

try (ObjectReader objectReader = repository.newObjectReader()) {
    while (tree.next()) {
        String fileName = tree.getPathString();
        byte[] fileBytes = objectReader.open(tree.getObjectId(0)).getBytes();        
    }
}
return paths;