Java 通过mave命令下载jar包的示例代码

之前一直都是使用的idea,创建maven工程进行jar包导入操作,居然接到了通过java 代码导入jar包的需求,满脸的懵逼,好在功夫不负有心人,最终将其拿来了,

现在这里记录一下,方便以后学习使用;

本次采用的方案是基于pom.xml模板的形式+maven命令的方式,到仓库下载jar报错,示例代码如下:

项目依赖:


 commons-io
 commons-io
 2.6

pom.xml模板:



 4.0.0
 2019
 com.tx.app
 autoapi
 jar
 1.0
 autoapi
 
 
 
  com.tx
  parent-pom
  1.0.2
 
 
 
  
   autoapi
   远端仓库地址
  
 
 
 
  
   
    org.apache.maven.plugins
    maven-dependency-plugin
    3.0.0
    
     
      
       {0}
       {1}
       {2}
      
     
    
   
  
 

代码示例:

public class MavenParse {
 private static String mavenPath = "/maven/apache-maven-3.6.3/bin/mvn";
 
 private static final String MVN_PARAM = " dependency:copy -DoutputDirectory=lib -U";
 
 void downloadDependency(DependencyDTO dependencyDTO, String jarName) throws Exception {
  // 准备下载命令
  String mavenCommandPath =
   System.getProperty("os.name").toLowerCase().startsWith("win") ? "mvn" : mavenPath;
  String mvnCmd = mavenCommandPath + MVN_PARAM;
 
  // 创建下载jar包存储的位置
  File workDir = getMavenRepository(jarName);
  // 基于模板创建pom.xml
  File pomFile = new File(workDir, "pom.xml");
  String pomXml = createPomModel(dependencyDTO);
  FileUtils.writeStringToFile(pomFile, pomXml, "utf-8");
  Process process = Runtime.getRuntime().exec(mvnCmd, null, workDir);
  // 验证下载成功
  if(null == process || process.waitFor()!= 0){
   FileUtils.deleteQuietly(workDir);
   throw new Exception("下载maven包失败,请检查maven配置");
  }
 }
 
 private String createPomModel(DependencyDTO dependencyDTO) throws IOException {
 
  File pomFile = new File(getClass().getResource("/pom.xml").getFile());
  String template = FileUtils.readFileToString(pomFile, "utf-8");
  return MessageFormat.format(template,
   dependencyDTO.getGroupId(),
   dependencyDTO.getArtifactId(),
   dependencyDTO.getVersion());
 
 }
 
 /**
  * 创建jar包存储的文件夹
  * @param fileName
  * @return
  * @throws Exception
  */
 private static File getMavenRepository(String fileName)throws Exception {
 
  String parentPath = System.getProperty("user.dir")+File.separator+"automation";
  parentPath = parentPath+File.separator+"mavenParse";
  parentPath = parentPath+File.separator+FilenameUtils.getBaseName(fileName);
 
  File dir = new File(parentPath);
  try {
   FileUtils.forceMkdir(dir);
  } catch (Exception e) {
   throw new RuntimeException(e);
  }
  return dir;
 }
}

测试代码:

public static void main(String[] args) throws Exception {
 String dependency = "\n"
  + "   commons-io\n"
  + "   commons-io\n"
  + "   2.6\n"
  + "  ";


 DependencyDTO dependencyDTO = new DependencyDTO();

 dependencyDTO.setGroupId("commons-io");
 dependencyDTO.setArtifactId("commons-io");
 dependencyDTO.setVersion("2.6");
 dependencyDTO.setPomContent(dependency);

 MavenParse parse = new MavenParse();

 parse.downloadDependency(dependencyDTO,"commons-io.jar");
}

好啦,暂时就先记录在这里,后面有机会在完善

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