ZipUtil.java

package com.eoeandorid.reader;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class ZipUtil {

	public static void unzipEpub(String inputZip, String destinationDirectory)throws Exception {
		long start = System.currentTimeMillis();
		int BUFFER = 1024;
		List zipFiles = new ArrayList();
		File sourceZipFile = new File(inputZip);
		File unzipDestinationDirectory = new File(destinationDirectory);
		unzipDestinationDirectory.mkdir();
		ZipFile zipFile;
		// Open Zip file for reading
		zipFile = new ZipFile(sourceZipFile, ZipFile.OPEN_READ);
		// Create an enumeration of the entries in the zip file
		Enumeration zipFileEntries = zipFile.entries();
		// Process each entry
		while (zipFileEntries.hasMoreElements()) {
			// grab a zip file entry
			ZipEntry entry = (ZipEntry) zipFileEntries.nextElement();
			String currentEntry = entry.getName();
			File destFile = new File(unzipDestinationDirectory, currentEntry);
			if (currentEntry.endsWith(".epub")) {
				zipFiles.add(destFile.getAbsolutePath());
			}
			// grab file's parent directory structure
			File destinationParent = destFile.getParentFile();
			// create the parent directory structure if needed
			destinationParent.mkdirs();
			try {
				// extract file if not a directory
				if (!entry.isDirectory()) {
					BufferedInputStream is =
							new BufferedInputStream(zipFile.getInputStream(entry));
					int currentByte;
					// establish buffer for writing file
					byte data[] = new byte[BUFFER];
					// write the current file to disk
					FileOutputStream fos = new FileOutputStream(destFile);
					BufferedOutputStream dest =
							new BufferedOutputStream(fos, BUFFER);
					// read and write until last byte is encountered
					while ((currentByte = is.read(data, 0, BUFFER)) != -1) {
						dest.write(data, 0, currentByte);
					}
					dest.flush();
					dest.close();
					is.close();
				}
			} catch (IOException ioe) {
				ioe.printStackTrace();
			}
		}
		zipFile.close();
		for (Iterator iter = zipFiles.iterator(); iter.hasNext();) {
			String zipName = (String)iter.next();
			ZipUtil.unzipEpub(zipName,destinationDirectory +File.separatorChar +
					zipName.substring(0,zipName.lastIndexOf(".epub")));
		}
	}

}