2019独角兽企业重金招聘Python工程师标准>>> 
开发过程中遇到这样的需求，Java拉取指定代码库指定分支的代码java代码，然后有maven打包，将打包好的jar上传到文件服务器。
解决思路分三步：
1.从Git仓库下载代码文件
2.用maven打包下载好的代码文件
3.上传jar
解决方案：
1.利用eclipse提供的JGit工具包实现拉包，Java执行Windows/Linux脚本实现maven构建（Linux类似）
参考地址：https://github.com/eclipse/jgit
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.transport.UsernamePasswordCredentialsProvider;
import java.io.File;
public class GitTest {
public static void main(String[] arg) {
String url = "http://git.mrpei.com/peizhouyu/HelloTest.git";
String localPath = "D:\\project\\";
String branchName = "master";
String username = "peizhouyu";
String password = "123456.";
try {
//1. 克隆代码
Git.cloneRepository()
.setURI(url).setBranch(branchName)
.setDirectory(new File(localPath))
.setCredentialsProvider(new UsernamePasswordCredentialsProvider(username, password))
.call();
//2.执行mvn打包 并等待命令执行完成
String commond = "cmd /c d: && cd d:\\project && mvn clean package -Dmaven.test.skip=true";
Process process = Runtime.getRuntime().exec(commond);
process.waitFor();
System.out.println("package finish");
//3.上传文件服务 target文件夹 后缀 jar文件
} catch (Exception e) {
e.printStackTrace();
}
}
}2.经过阅读JGit源码发现JGit其实也是依靠本地安装的git工具来执行代码下载，所以我们可以直接通过命令调用本地Git工具实现（Linux类似）
public class LocalTest {
public static void main(String[] args) {
String url = "http://git.mrpei.com/peizhouyu/HelloTest.git";
String localPath = "D:\\project\\";
String branchName = "master";
String username = "peizhouyu";
String password = "123456.";
String newUrl = "http://peizhouyu:[email protected]/peizhouyu/HelloTest.git";
try {
//0.命令拼接
String[] result = url.split("/");
String projectName = result[result.length - 1].split("\\.")[0];
System.out.println(projectName);
//1. 克隆代码
String cloneCommand = "cmd /c d: && cd d:\\project && git clone -b " + branchName + " " + result[0] + "//" + username + ":" + password + "@"
+ result[2] + "/" + result[3] + "/" + result[4];
System.out.println(cloneCommand);
Process cloneProcess = Runtime.getRuntime().exec(cloneCommand);
cloneProcess.waitFor();
System.out.println("clone success");
//2.执行mvn打包 并等待命令执行完成
//String real = "cmd /c d: && cd d:\\project && git clone -b master http://peizhouyu:[email protected]/peizhouyu/HelloTest.git && cd d:\\project\\HelloTest && mvn clean package -Dmaven.test.skip=true";
String packageCommand = "cmd /c d: && cd d:\\project\\" + projectName + " && mvn clean package -Dmaven.test.skip=true";
System.out.println(packageCommand);
Process process = Runtime.getRuntime().exec(packageCommand);
process.waitFor();
System.out.println("package finish");
//3.上传文件服务 target文件夹 后缀 jar文件
} catch (Exception e) {
e.printStackTrace();
}
}
}
3.利用GitLab API 通过http来下载源码包，本地解压，调用maven命令编译。
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.apache.tools.tar.TarEntry;
import org.apache.tools.tar.TarInputStream;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.GZIPInputStream;
public class GitApiTest {
private final static int BUFFER = 1048576;
public static void main(String[] args) {
String apiUrl = "http://git.xx.com/api/v4/projects/";
String projectId = "11111";
String branchName = "master";
String privateToken = "c1EssB1213232ZAvTdL";
String path = "D:\\project\\hello.tar.gz";
String sourceFolder = "D:\\project\\hello";
String projectDir = null;
String url = apiUrl + projectId + "/repository/archive";
System.out.println(url);
Map map = new HashMap();
map.put("private_token",privateToken);
map.put("sha",branchName);
HttpDownUtil.download("http://git.jd.com/api/v4/projects/30186/repository/archive",map,path);
System.out.println("下载完成 开始解压");
// unCompressArchiveGz(path);
//解压
File project = new File(path);
// decompress(project, sourceFolder);
try {
unTarGz(project,sourceFolder);
System.out.println("解压完成");
//获取解压后的文件夹名（项目文件夹名）
File[] unZipDirectoryArray = new File(sourceFolder).listFiles();
for (int i = 0; i < unZipDirectoryArray.length; i++){
if (unZipDirectoryArray[i].isDirectory()){
projectDir = unZipDirectoryArray[i].getAbsolutePath();
System.out.println(projectDir);
}
}
//进入项目目录执行 mvn 构建
System.out.println("开始执行mvn构建");
//projectDir = "D:\\project\\hello\\HelloTest-master-2c25a3cb8bd88d90838cf07eff20bc652fffbe40";
String commond = "cmd /c d: && cd " + projectDir +" && mvn clean package -Dmaven.test.skip=true";
//String commond = "cmd /c d: && cd d:\\project\\hello\\HelloTest-master-8d0c483bf0837bf0bc66914e9d746e1d9af6bad8 && start mvn clean package -Dmaven.test.skip=true";
System.out.println(commond);
Process process = Runtime.getRuntime().exec(commond);
//读取标准输出内容 防止输出缓冲区阻塞程序执行
String str;
BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(process.getInputStream()));
while ( (str = bufferedReader.readLine()) !=null) {
System.out.println(str);
}
process.waitFor();
System.out.println("package finish");
} catch (Exception e) {
e.printStackTrace();
}
}
public static void unTarGz(File file,String outputDir) throws IOException{
TarInputStream tarIn = null;
try{
tarIn = new TarInputStream(new GZIPInputStream(
new BufferedInputStream(new FileInputStream(file))),
1024 * 2);
createDirectory(outputDir,null);//创建输出目录
TarEntry entry = null;
while( (entry = tarIn.getNextEntry()) != null ){
if(entry.isDirectory()){//是目录
entry.getName();
createDirectory(outputDir,entry.getName());//创建空目录
}else{//是文件
File tmpFile = new File(outputDir + "/" + entry.getName());
createDirectory(tmpFile.getParent() + "/",null);//创建输出目录
OutputStream out = null;
try{
out = new FileOutputStream(tmpFile);
int length = 0;
byte[] b = new byte[2048];
while((length = tarIn.read(b)) != -1){
out.write(b, 0, length);
}
}catch(IOException ex){
throw ex;
}finally{
if(out!=null)
out.close();
}
}
}
}catch(IOException ex){
throw new IOException("解压归档文件出现异常",ex);
} finally{
try{
if(tarIn != null){
tarIn.close();
}
}catch(IOException ex){
throw new IOException("关闭tarFile出现异常",ex);
}
}
}
public static void createDirectory(String outputDir,String subDir){
File file = new File(outputDir);
if(!(subDir == null || subDir.trim().equals(""))){//子目录不为空
file = new File(outputDir + "/" + subDir);
}
if(!file.exists()){
if(!file.getParentFile().exists())
file.getParentFile().mkdirs();
file.mkdirs();
}
}
} 生成脚本文件 会增加磁盘I/O 不推荐