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import org.eclipse.jgit.api.*;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.diff.DiffEntry;
import org.eclipse.jgit.diff.DiffFormatter;
import org.eclipse.jgit.diff.RenameDetector;
import org.eclipse.jgit.lib.*;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.transport.URIish;
import org.eclipse.jgit.transport.UsernamePasswordCredentialsProvider;
import org.eclipse.jgit.treewalk.AbstractTreeIterator;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
*@author Mr.Ye
*@ClassName GitUtils
*@Date 2022/3/21
*@describe http://wiki.eclipse.org/JGit/User_Guide （eclipse-JGIT社区）
*@describe https:///centic9/jgit-cookbook (开源api)
*@describe https://www.136.la/tech/show-875175.html (刚开始可以看这个，参考GitUtils.test()方法)
* @describe 使用工具类以后需要主动调用GIT.close()方法，关闭git
*/
public class GitUtils {
private static final DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
private static final Logger logger = LoggerFactory.getLogger(GitUtils.class);
private final static String REF_HEADS = "refs/heads/";

/** 本地远程仓库--用于文件比较 默认路径不对外展示*/
private static String localRemotePath = "/local-remote/";

/**
* 初始化url
* 默认远程仓库的项目名称为最后一个路径
*/
public static HashMap<String, String> initUrl(String remotePath,String localPath){
String path =remotePath.split("\.git")[0];
String[] split= path.split("/");
String ss = split[split.length-1];
//本地地址
localPath = localPath+ss;
//本地远程地址 用于比较
localRemotePath = localRemotePath+ss;
HashMap<String, String> map = new HashMap<>();
map.put("localPath",localPath);
map.put("remotePath",remotePath);
map.put("localRemotePath",localRemotePath);
return map;
}

/**
* 克隆远程仓库
* @param localPath 本地地址 -（本地地址不存在，使用这个方法）
* @param remotePath 远程仓库
* @param provider 秘钥
* @param masterBranch 分支
* @return
*/
public static Git cloneRepository(String localPath, String remotePath,
UsernamePasswordCredentialsProvider provider,
String masterBranch) throws GitAPIException {
Git git = Git.cloneRepository()
.setCredentialsProvider(provider)
.setURI(remotePath)
.setRemote(masterBranch)
.setDirectory(new File(localPath))
.call();
return git;
}
/**
* 本地地址存在（使用这个方法）
* @return
*/
public static Git initGit(String localPath) {
File file = new File(localPath);
logger.info("本地文件路径"+localPath);
Git git = null;
/*路径是否存在*/
if(file.exists()) {
try {
git = Git.open(new File(localPath));
} catch (IOException e) {
e.printStackTrace();
git.close();
}
}
return git;
}
/**
* 初始化 将本地代码关联远程仓库，并推送数据至远程仓库(每个仓库只需要使用一次)
* @return
*/
public static Git onlyOnceGitInit(String localPath,String remotePath,
UsernamePasswordCredentialsProvider provider,String banceName)
throws GitAPIException, URISyntaxException {
/*初始化*/
Git git = Git.init().setDirectory(new File(localPath)).call();
/*关联远程仓库*/
git.remoteAdd().setName(banceName).setUri(new URIish(remotePath)).call();
/*本地暂存*/
git.add().addFilepattern(".").call();
/*本地提交*/
mit().setAll(true).setMessage("mit").call();
/*拉取最新代码*/
git.pull().setRemote(banceName).call();
/*推送到远程仓库*/
git.push().setRemote(banceName).setCredentialsProvider(provider).call();
return git;
}

/**
* 全部推送，返回提交的id
* --url 为空则默认全部推送
* --不为空则可以选择地址推送
* @throws GitAPIException
* @param git git
* @param message 提交信息
*/
public static String push(Git git,String message,List<String> url,UsernamePasswordCredentialsProvider provider,String banceName)
throws GitAPIException{
/*路径为空则暂存所有文件*/
AddCommand addCmd = git.add();
if (url==null ||url.size()<=0){
addCmd.addFilepattern(".");
}else {
for (String s : url) {
addCmd.addFilepattern(s);
}
}
addCmd.call();
/*提交到本地仓库*/
RevCommit revCommit = mit().setAll(true).setMessage(message).call();
/*推送到远程仓库*/
git.push().setRemote(banceName).setCredentialsProvider(provider).call();
logger.info("------ succeed ---------");
return revCommit.getName();
}

/**
* 拉取最新的代码
* @param git
* @return
*/
public static boolean pullNew(Git git,UsernamePasswordCredentialsProvider provider,String branchname){
try {
git.pull().setRemote(branchname).setCredentialsProvider(provider).call();
} catch (GitAPIException e) {
e.printStackTrace();
return false;
}
return true;
}

/**
* 放弃本地更改,
* --只重置工作区work以及暂存index中的文件，Respository中的数据不会被重置，未被git跟踪的数据也不会被提交
* @param git
* @return
*/
public static boolean reset(Git git,UsernamePasswordCredentialsProvider provider){
try {
/*先暂存所有文件 --这段代码会让未被跟踪的文件也加入到提交队列，当执行丢弃操作时，当前所有更改都会被丢弃*/
git.add().addFilepattern(".").call();
git.reset().setMode(ResetCommand.ResetType.HARD).call();
} catch (GitAPIException e) {
e.printStackTrace();
return false;
}
return true;
}

/**
* git 认证对象
* @param username
* @param password
* @return
*/
public static UsernamePasswordCredentialsProvider provider(String username,String password){
return new UsernamePasswordCredentialsProvider(username,password);

}

/**
* 根据branch 获取ref信息
* @param branchName
* @return
*/
public static Ref getBranchRef(Git git,String branchName) {
Ref result = null;
try {
result = git.getRepository().exactRef(REF_HEADS + branchName);
} catch (IOException e) {
e.printStackTrace();
}
return result;
}

/**
* 获取指定分支的指定文件内容
* @param branchName 分支名称
* @param javaPath 文件路径
* @return java类
* @throws IOException
*/
public static String getBranchSpecificFileContent(Git git,String branchName, String javaPath) throws IOException {
Ref branch = git.getRepository().exactRef( REF_HEADS + branchName);
ObjectId objId = branch.getObjectId();
RevWalk walk = new RevWalk( git.getRepository());
RevTree tree = walk.parseTree(objId);
return getFileContent(git,javaPath,tree,walk);
}

/**
* 获取指定分支指定的指定文件内容
* @param javaPath 件路径
* @param tree git RevTree
* @param walk git RevWalk
* @return java类
* @throws IOException
*/
private static String getFileContent(Git git, String javaPath, RevTree tree, RevWalk walk) throws IOException {
TreeWalk treeWalk = TreeWalk.forPath(git.getRepository(), javaPath, tree);
ObjectId blobId = treeWalk.getObjectId(0);
ObjectLoader loader = git.getRepository().open(blobId);
byte[] bytes = loader.getBytes();
walk.dispose();
return new String(bytes);
}

/**
* 通过CommitId获取分支树结构信息
* 此方法是为了兼容
* 被比较的分支（一般为master分支）的commitId已知的情况下，无需在获取Ref直接通过commitId获取分支树结构
* @mitId
* @return
* @throws IOException
*/
public static AbstractTreeIterator prepareTreeParser(Git git, mitId) throws IOException {
RevWalk walk = new RevWalk(git.getRepository());
RevCommit revCommit = walk.parseCommit(git.getRepository().mitId));
RevTree tree = walk.parseTree(revCommit.getTree().getId());
CanonicalTreeParser treeParser = new CanonicalTreeParser();
ObjectReader reader = git.getRepository().newObjectReader();
treeParser.reset(reader, tree.getId());
walk.dispose();
return treeParser;
}

/**
* 删除本地仓库还未提交的文件
*/
public static void deleteFile(Git git, List<String> urls) throws Exception {
RmCommand addCommand = git.rm();
if (urls==null || urls.size()<=0){
addCommand.addFilepattern(".");
}else {
for (String s:urls){
addCommand.addFilepattern(s);
}
}
addCommand.call();
}

/**
* 切换分支
* @param branchName 分支名称
* @throws GitAPIException GitAPIException
*/
public static void checkOut(Git git,String branchName) throws GitAPIException {
// 切换分支
git.checkout().setCreateBranch(false).setName(branchName).call();
}

/**
* 更新分支代码
* @param branchName 分支名称
* @throws GitAPIException GitAPIException
*/
public static Ref checkOutAndPull(Git git,String branchName,UsernamePasswordCredentialsProvider provider) throws GitAPIException {
// 1. 获取此分支的Ref信息
Ref branchRef = getBranchRef(git,branchName);
boolean isCreateBranch = branchRef == null;
/* TODO 这里可以增加判断 是否最新数据，如果是最新数据则后续两步操作可以省略*/

// 2. 切换分支
git.checkout().setCreateBranch(isCreateBranch).setName(branchName)
.setStartPoint( "origin/"+branchName)
.setUpstreamMode(CreateBranchCommand.SetupUpstreamMode.SET_UPSTREAM)
.call();
// 3. 拉取最新代码
git.pull().setCredentialsProvider(provider).call();
branchRef = getBranchRef(git,branchName);
return branchRef;
}

/**
* 判断本地是否最新代码
*
* @return boolean
* @throws GitAPIException GitAPIException
*/
public static boolean checkBranchNewVersion(Git remoteGit, Git git, UsernamePasswordCredentialsProvider provider,String branceName) throws GitAPIException {
boolean flag = false;
try {
String remote = LogRemote(remoteGit,provider,branceName);
String log = Log(git);
if (remote.equals(log)){
flag = true;
}
logger.info("比较版本信息，本地：{}，远程：{},是否一致：{}",log,remote,flag);
} catch (Exception e) {
e.printStackTrace();
}
return flag;
}

/**
* 获取提交记录
* @return
* @throws IOException
* @throws GitAPIException
* @param masterBranch 分支名称
*/
public static List<CommitMessage> getCommitMessages(Git git,Integer num,String masterBranch) throws IOException, GitAPIException {
List<CommitMessage> commitMessages = new ArrayList<>();
mitMessage =null;
/** 获取最新的10条提交记录来展示*/
Iterable<RevCommit> commits ;
if (StringUtils.isEmpty(masterBranch)){
/** 查所有分支记录*/
commits = git.log().setMaxCount(num).call();
}else {
/** 查指定分支数据记录*/
commits = git.log().add(git.getRepository().resolve(masterBranch)).setMaxCount(num).call();
}
for(mits) {
commitMessage = new CommitMessage();
commitMessage.mit.getName());
commitMessage.mit.getAuthorIdent().getName());
commitMessage.mit.getFullMessage());
commitMessage.setCommitDate(df.format(new mit.getCommitTime()*1000L)));
if (commit.getParents().length!=0){
commitMessage.mit.getParent(0).getName());
commitMessage.mit.getParent(0).getName());
}
commitMessage.mit.getAuthorIdent().getEmailAddress());
commitMessages.mitMessage);
}
mitMessages;
}

/**
* LogRemote 获取Git远程仓库版本号
* @param git
* @param git
* @return
* @throws IOException
* @throws GitAPIException
*/
public static String LogRemote(Git git,UsernamePasswordCredentialsProvider provider,String branceName)
throws GitAPIException {
String versionID = "";
pullNew(git,provider,branceName);
Iterable<RevCommit> iterable = git.log().setMaxCount(1).call();
for (RevCommit u : iterable) {
String ID = String.valueOf(u.getId());
//正则表达式 截取需要的部分
versionID = getMatcher("commit\s(\w+)\s?", ID);
break;
}
return versionID;
}

/**
* getMatcher 正则表达式方法
* @param regex
* @param source
* @return
*/
public static String getMatcher(String regex, String source) {
String str = "";
Pattern pattern = pile(regex);
Matcher matcher = pattern.matcher(source);
while (matcher.find()) {
// 只取第一组
str = matcher.group(1);
}
return str;
}
/**
* 获取Git本地仓库版本号
*
* @return versionID 版本号
* @throws IOException
* @throws GitAPIException
*/
public static String Log(Git git) throws GitAPIException {
String versionID = "";
Iterable<RevCommit> iterable = git.log().setMaxCount(1).call();
for (RevCommit u : iterable) {
//版本id
String ID = String.valueOf(u.getId());
versionID = getMatcher("commit\s(\w+)\s?", ID);
break;
}
git.close();
return versionID;
}

private final static String GIT = ".git";

/**
* 指定文件提交到git仓库中
* @param git git
* @param files 需要提交的文件列表(文件名)
* @return 返回本次提交的版本号
* @throws IOException
*/
public static mitToGitRepository(Git git, List<String> files,String message,String banceName,
UsernamePasswordCredentialsProvider provider) throws Exception {
//判断是否有被修改过的文件
List<DiffEntry>diffEntries = git.diff()
.setDestinationPrefix("HEAD")
.setPathFilter(PathFilterGroup.createFromStrings(files))
.call();
if (diffEntries == null || diffEntries.size() == 0) {
throw new Exception("提交的文件内容都没有被修改，不能提交");
}
//被修改过的文件
List<String> updateFiles=new ArrayList<String>();
DiffEntry.ChangeType changeType;
for(DiffEntry entry : diffEntries){
changeType = entry.getChangeType();
switch (changeType) {
case ADD:
case COPY:
case RENAME:
updateFiles.add(entry.getNewPath());
break;
case DELETE:
case MODIFY:
updateFiles.add(entry.getOldPath());
break;
}
}
//将文件提交到git仓库中，并返回本次提交的版本号
AddCommand addCmd = git.add();
for (String file : updateFiles) {
/*保存到 暂存区*/
addCmd.addFilepattern(file);
}
/*执行*/
addCmd.call();
mitCmd = mit();
for (String file : updateFiles) {
commitCmd.setOnly(file);
}
RevCommit revCommit = commitCmd.setMessage(message).call();
//提交到远程分支
git.push().setRemote(banceName).setCredentialsProvider(provider).call();
return revCommit.getName();
}

/**
* 将git仓库内容回滚到指定版本的上一个版本
* @param git git
* @param revision 指定的版本号
* @return true,回滚成功,否则flase
* @throws IOException
*/
public static boolean rollBackPreRevision(Git git, String revision) throws IOException, GitAPIException {
Repository repository = git.getRepository();
RevWalk walk = new RevWalk(repository);
ObjectId objId = repository.resolve(revision);
RevCommit revCommit = walk.parseCommit(objId);
String preVision = revCommit.getParent(0).getName();
git.reset().setMode(ResetCommand.ResetType.HARD).setRef(preVision).call();
repository.close();
return true;
}

/**
* 查询本次提交的日志
* @param git git
* @param revision 版本号
* @return
* @throws Exception
*/
public static List<DiffEntry> getLog(Git git , String revision) throws Exception {
Repository repository = git.getRepository();
ObjectId objId = repository.resolve(revision);
Iterable<RevCommit> allCommitsLater = git.log().add(objId).call();
Iterator<RevCommit> iter = allCommitsLater.iterator();
mit = iter.next();
TreeWalk tw = new TreeWalk(repository);
tw.mit.getTree());

commit = iter.next();
if (commit != null){
tw.mit.getTree());

} else{
return null;
}

tw.setRecursive(true);
RenameDetector rd = new RenameDetector(repository);
rd.addAll(DiffEntry.scan(tw));
return pute();
}

/**
* 获取暂存区，以及工作区所有文件,部门文件无法获取差异内容，该方法暂不使用
*/
public static List<ComparativeGit> status(Git git) throws Exception {
/*TODO 问题1：新增文件，git没办法捕捉到文件索引，所以数据无法展示，会出现异常，这里解决方法是：
先将所有文件add添加索引，然后重置索引
如果比较暂存区域的数据，需要先将所有文件提交至暂存区域 建立索引*/
git.add().addFilepattern(".").call();
/*重置索引*/
git.reset().call();
List<ComparativeGit> comparativeGit= new ArrayList<>();
Status status = git.status().call();
// //git add命令后会看到变化 (暂存区文件)
// status.getAdded().forEach(it->{
// logger.info("1");
// compareInfo(git,parativeGit);
// });
// //(暂存区文件)
// status.getChanged().forEach(it->{
// logger.info("2");
// compareInfo(git,parativeGit);
// });
//git rm命令会看到变化，从暂存区删除的文件列表
status.getRemoved().forEach(it ->{
logger.info("6");
compareInfo(git,parativeGit);
});
//修改的文件列表
status.getModified().forEach(it -> {
logger.info("7");
compareInfo(git,parativeGit);
});
//工作区新增的文件列表
status.getUntracked().forEach(it -> {
logger.info("8");
compareInfo(git,parativeGit);
});
//冲突的文件列表
status.getConflicting().forEach(it -> {
logger.info("9");
compareInfo(git,parativeGit);
});
//工作区删除的文件列表
status.getMissing().forEach(it -> {
logger.info("10");
compareInfo(git,parativeGit);
});
System.out.parativeGit);
parativeGit;
}
public static pareInfo(Git git,String url,List<ComparativeGit> comparativeGit){
/*获取指定文件内容,必须是版本库中已经存在的版本，新增文件不会打印文件内容*/
List<DiffEntry> diffEntries = null;
parative = new ComparativeGit();
try {
/** 获取差异文件,
* git diff head 工作区域 local history比较
* git diff --cached 暂存区域与local history比较*/
/** 目前使用 git diff --cached 来比较工作区与local Res比较 */
// diffEntries = git.diff().setCached(true)
// .setPathFilter(PathFilterGroup.createFromStrings(url)).call();
/** 目前使用 git diff head 来比较工作区与local Res比较 */
diffEntries = git.diff()
.setDestinationPrefix("HEAD")
.setPathFilter(PathFilterGroup.createFromStrings(url))
.call();
System.out.println(diffEntries);
ByteArrayOutputStream out = new ByteArrayOutputStream();
DiffFormatter formatter = new DiffFormatter(out);
formatter.setRepository( git.getRepository() );
for( DiffEntry entry : diffEntries ) {
String newPath = entry.getNewPath();
comparative.setUrl(newPath);
comparative.setType(entry.getChangeType().name());
comparative.setTypeName(entry.getChangeType().toString());
formatter.format(entry);
String diffText = out.toString("UTF-8");
/*截取内容*/
if (diffText!=null){
String[] split = diffText.split("@@");
diffText = split[split.length-1];
}
System.out.println(diffText);
comparative.setDiffText(diffText);
out.reset();
comparativeGit.parative);
}
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 测试api
* @param git
* @throws Exception
*/
public static void test(Git git) throws Exception {
Status status = git.status().call();
//git add命令后会看到变化
status.getAdded().forEach(it -> System.out.println("Add File :" + it));
//git rm命令会看到变化，从暂存区删除的文件列表
status.getRemoved().forEach(it -> System.out.println("Remove File :" + it));
//修改的文件列表
status.getModified().forEach(it -> System.out.println("Modified File :" + it));
//工作区新增的文件列表
status.getUntracked().forEach(it -> System.out.println("Untracked File :" + it));
//冲突的文件列表
status.getConflicting().forEach(it -> System.out.println("Conflicting File :" + it));
//工作区删除的文件列表
status.getMissing().forEach(it -> System.out.println("Missing File :" + it));

/*获取指定文件内容,必须是版本库中已经存在的版本，新增文件不会打印文件内容*/
List<DiffEntry> diffEntries = git.diff()
.setPathFilter(PathFilterGroup.createFromStrings(status.getModified())).call();
System.out.println(diffEntries);
ByteArrayOutputStream out = new ByteArrayOutputStream();
DiffFormatter formatter = new DiffFormatter( System.out );
formatter.setRepository( git.getRepository() );
for( DiffEntry entry : diffEntries ) {
System.out.println( "Entry: " + entry + ", from: " + entry.getOldId() + ", to: " + entry.getNewId() );
System.out.println(entry.getNewPath());
System.out.println(entry.getChangeType());
formatter.format(entry);
String diffText = out.toString("UTF-8");
System.out.println(diffText);
out.reset();
}
}