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2023-02-21
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:
pom.xml模板:
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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 Exceptihttp://on {
// 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 = "
+ "
+ "
+ "
+ " ";
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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