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：

<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.6</version></dependency>

pom.xml模板：

<?xml version='1.0' encoding='UTF-8'?><project xmlns='http://maven.apache.org/POM/4.0.0' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd'> <modelVersion>4.0.0</modelVersion> <inceptionYear>2019</inceptionYear> <groupId>com.tx.app</groupId> <artifactId>autoapi</artifactId> <packaging>jar</packaging> <version>1.0</version> <name>autoapi</name> <parent> <groupId>com.tx</groupId> <artifactId>parent-pom</artifactId> <version>1.0.2</version> </parent> <repositories> <repository> <id>autoapi</id> <url>远端仓库地址</url> </repository> </repositories> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <version>3.0.0</version> <configuration> <artifactItems> <artifactItem> <groupId>{0}</groupId> <artifactId>{1}</artifactId> <version>{2}</version> </artifactItem> </artifactItems> </configuration> </plugin> </plugins> </build></project>

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 = '<dependency>n' + ' <groupId>commons-io</groupId>n' + ' <artifactId>commons-io</artifactId>n' + ' <version>2.6</version>n' + ' </dependency>'; 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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