VersionFinder.java 文件源码

/**
 * Returns the version
 * 
 * @return String
 */
public static String getVersion() {
    String jarImplementation = VISNode.class.getPackage().getImplementationVersion();
    if (jarImplementation != null) {
        return jarImplementation;
    }
    String file = VISNode.class.getResource(".").getFile();
    String pack = VISNode.class.getPackage().getName().replace(".", "/") + '/';
    File pomXml = new File(file.replace("target/classes/" + pack, "pom.xml"));
    if (pomXml.exists()) {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(new InputSource(new FileReader(pomXml)));
            XPath xPath = XPathFactory.newInstance().newXPath();
            return (String) xPath.evaluate("/project/version", document, XPathConstants.STRING);
        } catch (IOException | ParserConfigurationException | XPathExpressionException | SAXException e) { }
    }
    return "Unknown version";
}