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Java 在运行时获取Maven工件版本_Java_Maven 2 - Fatal编程技术网

Java 在运行时获取Maven工件版本

Java 在运行时获取Maven工件版本,java,maven-2,Java,Maven 2,我注意到在Maven工件的JAR中,project.version属性包含在两个文件中: META-INF/maven/${groupId}/${artifactId}/pom.properties META-INF/maven/${groupId}/${artifactId}/pom.xml 有没有建议在运行时读取此版本的方法?您不需要访问特定于Maven的文件来获取任何给定库/类的版本信息 您只需使用getClass().getPackage().getImplementationVers

我注意到在Maven工件的JAR中,project.version属性包含在两个文件中:

META-INF/maven/${groupId}/${artifactId}/pom.properties
META-INF/maven/${groupId}/${artifactId}/pom.xml

有没有建议在运行时读取此版本的方法?

您不需要访问特定于Maven的文件来获取任何给定库/类的版本信息

您只需使用
getClass().getPackage().getImplementationVersion()
即可获取存储在.jar文件
MANIFEST.MF
中的版本信息。幸运的是Maven足够聪明,不幸的是Maven在默认情况下也没有将正确的信息写入清单


相反,我们必须修改

来跟进上面的答案,对于
.war
工件,我发现我必须将等效配置应用于
maven-war-plugin
,而不是
maven-jar-plugin

<plugin>
    <artifactId>maven-war-plugin</artifactId>
    <version>2.1</version>
    <configuration>
        <archive>                   
            <manifest>
                <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
            </manifest>
        </archive>
    </configuration>
</plugin>

maven战争插件
2.1
真的
真的

这将把版本信息添加到项目的
.jar
中的
MANIFEST.MF
(包含在
.war
WEB-INF/lib
中)

以下是一种从pom.properties获取版本的方法,可以从MANIFEST获取版本

public synchronized String getVersion() {
    String version = null;

    // try to load from maven properties first
    try {
        Properties p = new Properties();
        InputStream is = getClass().getResourceAsStream("/META-INF/maven/com.my.group/my-artefact/pom.properties");
        if (is != null) {
            p.load(is);
            version = p.getProperty("version", "");
        }
    } catch (Exception e) {
        // ignore
    }

    // fallback to using Java API
    if (version == null) {
        Package aPackage = getClass().getPackage();
        if (aPackage != null) {
            version = aPackage.getImplementationVersion();
            if (version == null) {
                version = aPackage.getSpecificationVersion();
            }
        }
    }

    if (version == null) {
        // we could not compute the version so use a blank
        version = "";
    }

    return version;
} 

我花了一些时间在这两种主要的方法上,但它们并不适合我。我正在使用Netbeans进行构建,可能还有更多的工作要做。我在Maven 3的一些构造中遇到了一些错误和警告,但我认为这些很容易纠正。没什么大不了的

在这篇关于DZone的文章中,我确实找到了一个看起来可维护且易于实现的答案:

我已经有了一个resources/config子文件夹,我将我的文件命名为app.properties,以更好地反映我们可能保存在那里的内容(如支持URL等)


唯一需要注意的是,Netbeans会发出警告,提示IDE需要过滤掉。不知道在哪里/如何。在这一点上没有效果。如果我需要穿过那座桥,也许有一个解决办法。祝您好运。

要在Eclipse和Maven版本中运行此功能,您应该添加
addDefaultImplementationEntries
addDefaultSpecificationEntries
pom条目,如其他回复中所述,然后使用以下代码:

public synchronized static final String getVersion() {
    // Try to get version number from pom.xml (available in Eclipse)
    try {
        String className = getClass().getName();
        String classfileName = "/" + className.replace('.', '/') + ".class";
        URL classfileResource = getClass().getResource(classfileName);
        if (classfileResource != null) {
            Path absolutePackagePath = Paths.get(classfileResource.toURI())
                    .getParent();
            int packagePathSegments = className.length()
                    - className.replace(".", "").length();
            // Remove package segments from path, plus two more levels
            // for "target/classes", which is the standard location for
            // classes in Eclipse.
            Path path = absolutePackagePath;
            for (int i = 0, segmentsToRemove = packagePathSegments + 2;
                    i < segmentsToRemove; i++) {
                path = path.getParent();
            }
            Path pom = path.resolve("pom.xml");
            try (InputStream is = Files.newInputStream(pom)) {
                Document doc = DocumentBuilderFactory.newInstance()
                        .newDocumentBuilder().parse(is);
                doc.getDocumentElement().normalize();
                String version = (String) XPathFactory.newInstance()
                        .newXPath().compile("/project/version")
                        .evaluate(doc, XPathConstants.STRING);
                if (version != null) {
                    version = version.trim();
                    if (!version.isEmpty()) {
                        return version;
                    }
                }
            }
        }
    } catch (Exception e) {
        // Ignore
    }

    // Try to get version number from maven properties in jar's META-INF
    try (InputStream is = getClass()
        .getResourceAsStream("/META-INF/maven/" + MAVEN_PACKAGE + "/"
                + MAVEN_ARTIFACT + "/pom.properties")) {
        if (is != null) {
            Properties p = new Properties();
            p.load(is);
            String version = p.getProperty("version", "").trim();
            if (!version.isEmpty()) {
                return version;
            }
        }
    } catch (Exception e) {
        // Ignore
    }

    // Fallback to using Java API to get version from MANIFEST.MF
    String version = null;
    Package pkg = getClass().getPackage();
    if (pkg != null) {
        version = pkg.getImplementationVersion();
        if (version == null) {
            version = pkg.getSpecificationVersion();
        }
    }
    version = version == null ? "" : version.trim();
    return version.isEmpty() ? "unknown" : version;
}
公共同步静态最终字符串getVersion(){
//尝试从pom.xml(在Eclipse中提供)获取版本号
试一试{
字符串className=getClass().getName();
字符串classfileName=“/”+className.replace(“.”,“/”)+“.class”;
URL classfileResource=getClass().getResource(classfileName);
if(classfileResource!=null){
Path absolutePackagePath=Path.get(classfileResource.toURI())
.getParent();
int-packagePathSegments=className.length()
-className.replace(“.”,“”)。length();
//从路径中删除包段,再加上两个级别
//对于“目标/类别”,这是
//Eclipse中的类。
路径路径=绝对打包路径;
对于(int i=0,segmentsToRemove=packagePathSegments+2;
i

如果您的Java构建将目标类放置在“target/classes”之外的某个位置,那么您可能需要调整segmentsToRemove的值。

我正在使用
maven assembly plugin
进行maven打包。in的使用也可以起到以下作用:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-assembly-plugin</artifactId>
    <configuration>
        <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
        <archive>
            <manifest>
                <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
            </manifest>
        </archive>
    </configuration>
    <executions>
        <execution .../>
    </executions>
</plugin>

org.apache.maven.plugins

,它可以被多个maven构建插件使用,如果引入两个或多个插件,其中包括
archive
configuration in。在EAP 7.0上测试

@Log4j // lombok annotation
@Startup
@Singleton
public class ApplicationLogic {

    public static final String DEVELOPMENT_APPLICATION_NAME = "application";

    public static final String DEVELOPMENT_GROUP_NAME = "com.group";

    private static final String POM_PROPERTIES_LOCATION = "/META-INF/maven/" + DEVELOPMENT_GROUP_NAME + "/" + DEVELOPMENT_APPLICATION_NAME + "/pom.properties";

    // In case no pom.properties file was generated or wrong location is configured, no pom.properties loading is done; otherwise VERSION will be assigned later
    public static String VERSION = "No pom.properties file present in folder " + POM_PROPERTIES_LOCATION;

    private static final String VERSION_ERROR = "Version could not be determinated";

    {    
        Optional.ofNullable(getClass().getResourceAsStream(POM_PROPERTIES_LOCATION)).ifPresent(p -> {

            Properties properties = new Properties();

            try {

                properties.load(p);

                VERSION = properties.getProperty("version", VERSION_ERROR);

            } catch (Exception e) {

                VERSION = VERSION_ERROR;

                log.fatal("Unexpected error occured during loading process of pom.properties file in META-INF folder!");
            }
        });
    }
}

在我的spring boot应用程序中,来自公认答案的解决方案一直有效,直到我最近将jdk更新为版本12。也尝试了所有其他答案,但都无法实现

此时,我在我的spring boot应用程序的第一个类中添加了下面的一行,就在注释

@Log4j // lombok annotation
@Startup
@Singleton
public class ApplicationLogic {

    public static final String DEVELOPMENT_APPLICATION_NAME = "application";

    public static final String DEVELOPMENT_GROUP_NAME = "com.group";

    private static final String POM_PROPERTIES_LOCATION = "/META-INF/maven/" + DEVELOPMENT_GROUP_NAME + "/" + DEVELOPMENT_APPLICATION_NAME + "/pom.properties";

    // In case no pom.properties file was generated or wrong location is configured, no pom.properties loading is done; otherwise VERSION will be assigned later
    public static String VERSION = "No pom.properties file present in folder " + POM_PROPERTIES_LOCATION;

    private static final String VERSION_ERROR = "Version could not be determinated";

    {    
        Optional.ofNullable(getClass().getResourceAsStream(POM_PROPERTIES_LOCATION)).ifPresent(p -> {

            Properties properties = new Properties();

            try {

                properties.load(p);

                VERSION = properties.getProperty("version", VERSION_ERROR);

            } catch (Exception e) {

                VERSION = VERSION_ERROR;

                log.fatal("Unexpected error occured during loading process of pom.properties file in META-INF folder!");
            }
        });
    }
}
@PropertySources({ 
        @PropertySource("/META-INF/maven/com.my.group/my-artefact/pom.properties")
})
@Value("${version}")
private String appVersion;
    private static Optional<String> getVersionFromManifest(Class<?> clazz) {
        try {
            File file = new File(clazz.getProtectionDomain().getCodeSource().getLocation().toURI());
            if (file.isFile()) {
                JarFile jarFile = new JarFile(file);
                Manifest manifest = jarFile.getManifest();
                Attributes attributes = manifest.getMainAttributes();
                final String version = attributes.getValue("Bundle-Version");
                return Optional.of(version);
            }
        } catch (Exception e) {
            // ignore
        }
        return Optional.empty();
    }
@Configuration
@RequiredArgsConstructor // <- lombok
public class OpenApi {

    private final BuildProperties buildProperties; // <- you can also autowire it

    @Bean
    public OpenAPI yourBeautifulAPI() {
        return new OpenAPI().info(new Info()
            .title(buildProperties.getName())
            .description("The description")
            .version(buildProperties.getVersion())
            .license(new License().name("Your company")));
    }
}
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <executions>
                <execution>
                    <id>build-info</id>
                    <goals>
                        <goal>build-info</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
import java.io.IOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.info.BuildProperties;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ModelAttribute;

@ControllerAdvice
public class CommonControllerAdvice
{
       @Autowired
       BuildProperties buildProperties;
    
       @ModelAttribute("version")
       public String getVersion() throws IOException
       {
          String version = buildProperties.getVersion();
          return version;
       }
    }