Java 通過mave命令下載jar包的示例程式碼
阿新 • • 發佈:2020-11-18
之前一直都是使用的idea,建立maven工程進行jar包匯入操作,居然接到了通過java 程式碼匯入jar包的需求,滿臉的懵逼,好在功夫不負有心人,最終將其拿來了,
現在這裡記錄一下,方便以後學習使用;
本次採用的方案是基於pom.xml模板的形式+maven命令的方式,到倉庫下載jar報錯,示例程式碼如下:
專案依賴:
<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>遠端倉庫地址</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>
程式碼示例:
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 { // 準備下載命令 String mavenCommandPath = System.getProperty("os.name").toLowerCase().startsWith("win") ? "mvn" : mavenPath; String mvnCmd = mavenCommandPath + MVN_PARAM; // 建立下載jar包儲存的位置 File workDir = getMavenRepository(jarName); // 基於模板建立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); // 驗證下載成功 if(null == process || process.waitFor()!= 0){ FileUtils.deleteQuietly(workDir); throw new Exception("下載maven包失敗,請檢查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()); } /** * 建立jar包儲存的資料夾 * @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; } }
測試程式碼:
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,暫時就先記錄在這裡,後面有機會在完善
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