​ 实现功能：借助jgit实现拉取文件，并返回文件路径清单

<!-- 依赖库 版本号有自行选择，只是需要注意支持的jdk版本即可，我使用的是jdk1.8-->
<dependency><groupId>org.eclipse.jgit</groupId><artifactId>org.eclipse.jgit</artifactId><version>5.13.2.202306221912-r</version>
</dependency>

// 还是用的 hutool和 lombok ，没有引入相关依赖的可以删除相关代码，使用类似代码替代。
import cn.hutool.core.util.StrUtil;
import lombok.extern.slf4j.Slf4j;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.PullResult;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.diff.DiffEntry;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.storage.file.FileRepositoryBuilder;
import org.eclipse.jgit.transport.FetchResult;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;import javax.validation.constraints.NotNull;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;@Slf4j
public class GitUtil {/*** 克隆git库.* @param url* @param localPath*/public static void cloneRepository(String url, String localPath) {try {Git git = Git.cloneRepository().setURI(url).setDirectory(new File(localPath)).call();Repository repository = git.getRepository();repository.close();log.info("Cloned repository successfully from {} to {}", url, localPath);} catch (GitAPIException e) {log.error("Failed to clone repository from {} to {}", url, localPath, e);} catch (Exception e) {log.error("Failed to clone repository from {} to {}", url, localPath, e);}}/*** 初始化本地git库.* @param localPath*/public static void initRepository(String localPath) {try {Git git = Git.init().setDirectory(new File(localPath)).call();Repository repository = git.getRepository();repository.close();log.info("Initialized repository successfully at {}", localPath);} catch (GitAPIException e) {log.error("Failed to initialize repository at {}", localPath, e);} catch (Exception e) {log.error("Failed to initialize repository at {}", localPath, e);}}/*** 添加* @param git*/public static void addAll(Git git) {try {git.add().addFilepattern(".").call();log.info("Added all files to staging area");} catch (GitAPIException e) {log.error("Failed to add all files to staging area", e);} catch (Exception e) {log.error("Failed to add all files to staging area", e);}}/*** 提交* @param git* @param message*/public static void commit(Git git, String message) {try {git.commit().setMessage(message).call();log.info("Committed changes with message: {}", message);} catch (GitAPIException e) {log.error("Failed to commit changes with message: {}", message, e);} catch (Exception e) {log.error("Failed to commit changes with message: {}", message, e);}}/*** 依据本地目录获取本地git库* @param localPath* @return*/public static Repository getRepository(String localPath) {FileRepositoryBuilder builder = new FileRepositoryBuilder();try {return builder.setGitDir(new File(localPath + "/.git")).readEnvironment().findGitDir().build();} catch (Exception e) {log.error("Failed to open repository at {}", localPath, e);return null;}}private static CanonicalTreeParser getTreeByObjectId(Git git, ObjectId objectId) throws Exception {try (ObjectReader reader = git.getRepository().newObjectReader();) {CanonicalTreeParser treeIter = new CanonicalTreeParser();treeIter.reset(reader, objectId);return treeIter;}}private static String getChangeType(DiffEntry diffEntry) {if (StrUtil.equals("/dev/null", diffEntry.getNewPath())) {return "del";}if (StrUtil.equals("/dev/null", diffEntry.getOldPath())) {return "add";}return "update";}private static void addDiifToMap(@NotNull Map<String, List<String>> changeInfoMap, @NotNull DiffEntry diffEntry) {String changeType = getChangeType(diffEntry);List<String> fileNameList = changeInfoMap.get(changeType);if (fileNameList == null) {changeInfoMap.put(changeType, new ArrayList<>());fileNameList = changeInfoMap.get(changeType);}fileNameList.add(StrUtil.equals("del", changeType) ? diffEntry.getOldPath() : diffEntry.getNewPath());}/*** 拉取文件并返回拉取的文件清单* @param repository* @return 返回 del（删除）、add（新增）、update（更新）的文件清单*/public static Map<String, List<String>> pull(Repository repository) {Map<String, List<String>> changeInfoMap = new HashMap<>();try (Git git = new Git(repository);) {// 1.拉取前记录当前的版本号.FetchResult fetchResult = git.fetch().call();ObjectId oldHead = git.getRepository().resolve("HEAD^{tree}");// 2.拉取并记录拉取后的版本号PullResult result = git.pull().call();ObjectId newHead = git.getRepository().resolve("HEAD^{tree}");// 3.计算差异清单。List<DiffEntry> diffs = git.diff().setNewTree(getTreeByObjectId(git, newHead)).setOldTree(getTreeByObjectId(git, oldHead)).call();for (DiffEntry entry : diffs) {addDiifToMap(changeInfoMap,entry);}} catch (GitAPIException e) {log.error("Failed to pull changes from remote repository", e);} catch (Exception e) {log.error("Failed to pull changes from remote repository", e);}return changeInfoMap;}
}

使用方式：

1.	在将代码库拉取到本地的目录中（也可以通过上面的代码，直接从远程仓库克隆到本地目录中）
2.	使用pull方法即可针对指定目录的git库进行拉取并返回拉取的文件清单，以做其他用处。

以上仅为案例，实际功能还需要配合其他逻辑实现。