Java构建基础知识

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Java修改dependencies

pom.xml

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<dependency>
  <groupId>org.apache.maven</groupId>
  <artifactId>maven-model</artifactId>
  <version>3.8.6</version>
</dependency>

java代码

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package cn.idea360;

import org.apache.maven.model.Dependency;
import org.apache.maven.model.Model;
import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
import org.apache.maven.model.io.xpp3.MavenXpp3Writer;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.List;

/**
 * @author cuishiying
 * @date 2022-11-03
 */
public class MavenModel {

    public static void main(String[] args) throws IOException, XmlPullParserException {
        MavenXpp3Reader reader = new MavenXpp3Reader();
        Model model = reader.read(new FileReader("pom.xml"));
        List<Dependency> dependencies = model.getDependencies();
        Dependency addDependency = new Dependency();
        addDependency.setGroupId("cn.idea360");
        addDependency.setArtifactId("log-kafka-spring-boot-starter");
        addDependency.setVersion("2.0.2");
        dependencies.add(addDependency);

        model.setDependencies(dependencies);
        MavenXpp3Writer mavenXpp3Writer = new MavenXpp3Writer();
        mavenXpp3Writer.write(new FileWriter("pom.xml"),model);
    }
}

Java执行maven指令

pom.xml

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<dependency>
  <groupId>org.apache.maven.shared</groupId>
  <artifactId>maven-invoker</artifactId>
  <version>3.0.1</version>
</dependency>

Java代码

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package cn.idea360;

import org.apache.maven.shared.invoker.*;

import java.io.File;
import java.util.Arrays;

/**
 * java执行maven命令: mvn clean package
 *
 * @author cuishiying
 * @date 2022-11-03
 */
public class MavenExecutor {

    public static void main(String[] args) {
        InvocationRequest request = new DefaultInvocationRequest();
        request.setPomFile(new File("pom.xml"));
        request.setGoals(Arrays.asList("clean", "package"));

        Invoker invoker = new DefaultInvoker();
        invoker.setMavenHome(new File(System.getenv().get("MAVEN_HOME")));

//        invoker.setLogger(new PrintStreamLogger(System.err, InvokerLogger.ERROR) { });
//        invoker.setOutputHandler(System.out::println);

        try {
            invoker.execute(request);
        } catch (MavenInvocationException e) {
            e.printStackTrace();
        }

        try {
            if (invoker.execute(request).getExitCode() == 0) {
                System.out.println("success");
            } else {
                System.err.println("error");
            }
        } catch (MavenInvocationException e) {
            e.printStackTrace();
        }
    }
}

将远程仓库拉取到本地仓库

pom.xml

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<dependency>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-dependency-plugin</artifactId>
  <version>3.3.0</version>
</dependency>

shell

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mvn org.apache.maven.plugins:maven-dependency-plugin:3.3.0:get -D'repoUrl'=https://mvnrepository.com -D'artifact'=cn.idea360:log-kafka-spring-boot-starter:2.0.2

将jar包下载到指定目录

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mvn dependency:copy-dependencies -DoutputDirectory=./libs

远程仓库地址即配置在pom.xml中的仓库地址

自定义META-INF/MANIFEST.MF

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<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <version>3.1.2</version>
    <configuration>
        <archive>
            <manifestEntries>　　　　　
                <Build-Version>${maven.build.timestamp}</Build-Version>
            </manifestEntries>
            <manifestFile>src/main/resources/META-INF/MANIFEST.MF</manifestFile>
        </archive>
    </configuration>
</plugin>

manifests读取修改

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<dependency>
    <groupId>com.jcabi</groupId>
    <artifactId>jcabi-manifests</artifactId>
    <version>0.7.5</version>
</dependency>
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Manifests.inject("ota-site", "idea360.cn");
log.info("ota-site: {}", Manifests.read("ota-site"));

jar包基础信息

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private static void checkManifest() throws Exception {
    log.info("项目根路径: {}", System.getProperty("user.dir"));

    String path = ClassUtils.getDefaultClassLoader().getResource("").getPath();
    log.info("classes-path1: {}", URLDecoder.decode(path, "utf-8"));

    String path2 = ResourceUtils.getURL("classpath:").getPath();
    log.info("classes-path2: {}", path2);

    if (path.startsWith("file")) {
        path = path.substring(5).replace("!/BOOT-INF/classes!/", "");
    }
    JarFile jarFile = new JarFile(path);
    Manifest manifest = jarFile.getManifest();
    Attributes mainAttributes = manifest.getMainAttributes();
    mainAttributes.forEach((key, value) -> log.info("manifest: [{}]", key + ":" + value));
    mainAttributes.put(new Attributes.Name("author"), "cuishiying");

    Manifests.inject("ota-site", "idea360.cn");
    log.info("ota-site: {}", Manifests.read("ota-site"));

    PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
    Resource[] resources = resolver.getResources(ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + "META-INF/MANIFEST.MF");
    for (Resource resource : resources) {
        URL manifestUrl = resource.getURL();
        if ("jar".equals(manifestUrl.getProtocol())
                && manifestUrl.toString().endsWith("!/META-INF/MANIFEST.MF")
                && !manifestUrl.toString().contains("/BOOT-INF/lib/")) {
            log.info("MANIFEST.MF: {}", manifestUrl);
        }
    }

    Properties properties = new Properties();
    properties.load(ClassUtils.getDefaultClassLoader().getResourceAsStream("xxx.properties"));
    log.info("自定义配置文件: {}", properties);

}

参考

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