引入jgit
maven引入：

    
    
        org.eclipse.jgit
        org.eclipse.jgit
        5.6.0.201912101111-r

jgit 有一个Git类，可以用来执行常规的git操作

凭证管理
通过CredentialsProvider管理凭证，常用的是UsernamePasswordCredentialsProvider

通过下面代码初始化：

public static CredentialsProvider createCredential(String userName, String password) {
return new UsernamePasswordCredentialsProvider(userName, password);
}
clone远程仓库
git 命令：

git clone {repoUrl}
通过Git.cloneRepository 来clone远程仓库，如果需要凭证，则需要指定credentialsProvider

public static Git fromCloneRepository(String repoUrl, String cloneDir, CredentialsProvider provider) throws GitAPIException {
Git git = Git.cloneRepository()
.setCredentialsProvider(provider)
.setURI(repoUrl)
.setDirectory(new File(cloneDir)).call();
return git;
}
commit
git 命令：

git commit -a -m '{msg}'
commit比较简单，对应commit方法, 注意需要先add

public static void commit(Git git, String message, CredentialsProvider provider) throws GitAPIException {
    git.add().addFilepattern(".").call();
    git.commit()
        .setMessage(message)
        .call();
}

push
git 命令：

git push origin branchName
push直接调用push即可, 需要指定credentialsProvider

public static void push(Git git, CredentialsProvider provider) throws GitAPIException, IOException {
push(git,null,provider);
}

public static void push(Git git, String branch, CredentialsProvider provider) throws GitAPIException, IOException {
    if (branch == null) {
        branch = git.getRepository().getBranch();
    }
    git.push()
        .setCredentialsProvider(provider)
        .setRemote("origin").setRefSpecs(new RefSpec(branch)).call();
}

读取已有仓库
如果git已经clone了，想直接读取，怎么办？

public static Repository getRepositoryFromDir(String dir) throws IOException {
return new FileRepositoryBuilder()
.setGitDir(Paths.get(dir, ".git").toFile())
.build();
}
读取仓库日志
可以通过RevWalk读取仓库日志。

revWalk.parseCommit 可读取一条commit
遍历revWalk，可读取所有日志
public static List getLogs(Repository repository) throws IOException {
return getLogsSinceCommit(repository, null, null);
}

public static List getLogsSinceCommit(Repository repository, String commit) throws IOException {
    return getLogsSinceCommit(repository, null, commit);
}

public static List getLogsSinceCommit(Repository repository, String branch, String commit) throws IOException {
    if (branch == null) {
        branch = repository.getBranch();
    }
    Ref head = repository.findRef("refs/heads/" + branch);
    List commits = new ArrayList<>();
    if (head != null) {
        try (RevWalk revWalk = new RevWalk(repository)) {
            revWalk.markStart(revWalk.parseCommit(head.getObjectId()));
            for (RevCommit revCommit : revWalk) {
                if (revCommit.getId().getName().equals(commit)) {
                    break;
                }
                commits.add(revCommit.getFullMessage());
                System.out.println("\nCommit-Message: " + revCommit.getFullMessage());
            }
            revWalk.dispose();
        }
    }

    return commits;
}

测试
我们来先clone仓库，然后修改，最后push

String yaml = "dependencies:\n" +
"- name: springboot-rest-demo\n" +
" version: 0.0.5\n" +
" repository: http://hub.hubHOST.com/chartrepo/ainote\n" +
" alias: demo\n" +
"- name: exposecontroller\n" +
" version: 2.3.82\n" +
" repository: http://chartmuseum.jenkins-x.io\n" +
" alias: cleanup\n";
CredentialsProvider provider = createCredential("USR_NAME", "PASSWORD");

    String cloneDir = "/tmp/test";

    Git git = fromCloneRepository("http://gitlab.GITHOST.cn/datahub/env-test.git", cloneDir, provider);

    // 修改文件

    FileUtils.writeStringToFile(Paths.get(cloneDir, "env", "requirements.yaml").toFile(), yaml, "utf-8");

    // 提交
    commit(git, "deploy(app): deploy  springboot-rest-demo:0.0.5 to env test", provider);
    // push 到远程仓库
    push(git, "master", provider);

    git.clean().call();
    git.close();

    FileUtils.deleteDirectory(new File(cloneDir));

读取已有仓库的日志：

    Repository repository = getRepositoryFromDir("GIT_DIR");
    List logs = getLogs(repository);
    System.out.println(logs);

    RevCommit head = getLastCommit(repository);
    System.out.println(head.getFullMessage());

小结
本文讲述了如何通过jgit完成常规的git操作。
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