version.java

来自「java 的源代码」· Java 代码 · 共 50 行

package com.reddragon2046.base.utilities.data;

import java.io.IOException;
import java.io.PrintStream;
import java.util.Properties;

final class Version
{

    Version()
    {
    }

    public static void main(String args[])
    {
        try
        {
            Properties versionProps = getVersionInfo();
            String productName = versionProps.getProperty("product.name");
            String copyright = versionProps.getProperty("copyright");
            String versionString = versionProps.getProperty("version.major") + "." + versionProps.getProperty("version.minor") + "." + versionProps.getProperty("version.revision");
            String buildNumber = versionProps.getProperty("build.number");
            String buildDateTime = versionProps.getProperty("build.date");
            System.out.println(productName + " version " + versionString + "  (Build " + buildNumber + " at " + buildDateTime + ")");
            System.out.println(copyright);
        }
        catch(Exception e)
        {
            e.printStackTrace(System.err);
        }
    }

    private static Properties getVersionInfo()
        throws IOException
    {
        Properties props = new Properties();
        java.io.InputStream inStream = ClassLoader.getSystemResourceAsStream("version.properties");
        props.load(inStream);
        return props;
    }

    private static final String PRODUCT_NAME_KEY = "product.name";
    private static final String COPYRIGHT_KEY = "copyright";
    private static final String VERSION_MAJOR_KEY = "version.major";
    private static final String VERSION_MINOR_KEY = "version.minor";
    private static final String VERSION_REVISION_KEY = "version.revision";
    private static final String BUILD_NUMBER_KEY = "build.number";
    private static final String BUILD_DATETIME_KEY = "build.date";
}