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JBake is a Java based open source static site/blog generator for developers.
There is a newer version: 2.7.0-rc.7
package org.jbake.launcher;

import org.apache.commons.configuration2.CompositeConfiguration;
import org.jbake.app.ZipUtil;
import org.jbake.app.configuration.DefaultJBakeConfiguration;
import org.jbake.app.configuration.JBakeConfiguration;

import java.io.File;
import java.io.FileInputStream;

/**
 * Initialises sample folder structure with pre-defined template
 *
 * @author Jonathan Bullock [email protected]
 *
 */
public class Init {

    private final JBakeConfiguration config;

    /**
     * @param config The project configuration
     * @deprecated use {@link Init#Init(JBakeConfiguration)} instead
     */
    @Deprecated
    public Init(CompositeConfiguration config) {
        this(new DefaultJBakeConfiguration(config));
    }

    public Init(JBakeConfiguration config) {
        this.config = config;
    }

    /**
     * Performs checks on output folder before extracting template file
     *
     * @param outputFolder                        Target directory for extracting template file
     * @param templateLocationFolder  Source location for template file
     * @param templateType                        Type of the template to be used
     * @throws Exception                            if required folder structure can't be achieved without content overwriting
     */
    public void run(File outputFolder, File templateLocationFolder, String templateType) throws Exception {
        if (!outputFolder.canWrite()) {
            throw new Exception("Output folder is not writeable!");
        }

        File[] contents = outputFolder.listFiles();
        boolean safe = true;
        if (contents != null) {
            for (File content : contents) {
                if (content.isDirectory()) {
                    if (content.getName().equalsIgnoreCase(config.getTemplateFolderName())) {
                        safe = false;
                    }
                    if (content.getName().equalsIgnoreCase(config.getContentFolderName())) {
                        safe = false;
                    }
                    if (content.getName().equalsIgnoreCase(config.getAssetFolderName())) {
                        safe = false;
                    }
                }
            }
        }

        if (!safe) {
            throw new Exception(String.format("Output folder '%s' already contains structure!",
                    outputFolder.getAbsolutePath()));
        }
        if (config.getExampleProjectByType(templateType) != null) {
            File templateFile = new File(templateLocationFolder, config.getExampleProjectByType(templateType));
            if (!templateFile.exists()) {
                throw new Exception("Cannot find example project file: " + templateFile.getPath());
            }
            ZipUtil.extract(new FileInputStream(templateFile), outputFolder);
        } else {
            throw new Exception("Cannot locate example project type: " + templateType);
        }
    }
}