testEmptyFolderCompression

AppZip

// taken from http://www.mkyong.com/java/how-to-compress-files-in-zip-format/
// and slightly modified to test my hypothesis.

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
 
public class AppZip
{
    List<String> fileList;
    private static final String OUTPUT_ZIP_FILE = "C:\\Users\\denis\\Desktop\\failest.zip";
    private static final String SOURCE_FOLDER = "C:\\Users\\denis\\Desktop\\failtest";
 
    AppZip(){
	fileList = new ArrayList<String>();
    }
 
    public static void main( String[] args )
    {
    	AppZip appZip = new AppZip();
    	appZip.generateFileList(new File(SOURCE_FOLDER));
        if (appZip.fileList.isEmpty()) {
            System.out.println("fileList is empty");
        }
    	appZip.zipIt(OUTPUT_ZIP_FILE);
        File resultFile = new File(OUTPUT_ZIP_FILE);
        if (resultFile.exists() && !resultFile.isDirectory()) {
            System.out.println("File " + OUTPUT_ZIP_FILE + " created");
        }
    }
 
    /**
     * Zip it
     * @param zipFile output ZIP file location
     */
    public void zipIt(String zipFile) {
 
     byte[] buffer = new byte[1024];
 
     try{
 
    	FileOutputStream fos = new FileOutputStream(zipFile);
    	ZipOutputStream zos = new ZipOutputStream(fos);
 
    	System.out.println("Output to Zip : " + zipFile);
 
    	for(String file : this.fileList){
 
    		System.out.println("File Added : " + file);
    		ZipEntry ze= new ZipEntry(file);
        	zos.putNextEntry(ze);
            try {
            
            
        	FileInputStream in = 
                       new FileInputStream(SOURCE_FOLDER + File.separator + file);
 
        	int len;
        	while ((len = in.read(buffer)) > 0) {
        		zos.write(buffer, 0, len);
        	}
 
        	in.close();
            } catch(FileNotFoundException fne) {
                fne.printStackTrace();
            }
    	}
 
    	zos.closeEntry();
    	//remember close it
    	zos.close();
 
    	System.out.println("Done");
    }catch(IOException ex){
       ex.printStackTrace();   
    }
   }
 
    /**
     * Traverse a directory and get all files,
     * and add the file into fileList  
     * @param node file or directory
     */
    public void generateFileList(File node) {
        System.out.println("Inside generateFileList with file: " + node.getName());
    	//add file only
        if(node.isFile()) {
            fileList.add(generateZipEntry(node.getAbsoluteFile().toString()));
        }
 
        if(node.isDirectory()) {
            System.out.println(node.getName() + " is a directory... going deeper!");
            String[] subNote = node.list();
            if (subNote.length == 0) {
                System.out.println(node.getName() + " has no subfolders or files");
                fileList.add(generateZipEntry(node.getAbsoluteFile().toString() + "/"));
            }
            for(String filename : subNote){
                generateFileList(new File(node, filename));
            }
        }
 
    }
 
    /**
     * Format the file path for zip
     * @param file file path
     * @return Formatted file path
     */
    private String generateZipEntry(String file) {
    	return file.substring(SOURCE_FOLDER.length()+1, file.length());
    }
}