Unzip in Java

ZipUtils.java

package utils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

/**
 * Zip utilities
 *
 * @author Musubu Inc.
 */
public class ZipUtils {
  /**
   * Unzip a zip file
   *
   * @param file
   * @param parentDirectoryPath
   * @throws IOException
   */
  public static void unzip(File file, String parentDirectoryPath) throws IOException {
    if (!StringUtils.isEmpty(parentDirectoryPath)) {
      File parentDirectory = new File(parentDirectoryPath);
      if (!parentDirectory.exists()) {
        parentDirectory.mkdirs();
      }

      parentDirectoryPath = parentDirectoryPath + "/";
    }

    ZipFile zipFile = new ZipFile(file);
    Enumeration enumeration = zipFile.entries();

    while (enumeration.hasMoreElements()) {
      ZipEntry zipEntry = (ZipEntry) enumeration.nextElement();

      if (zipEntry.isDirectory()) {
        new File(parentDirectoryPath + zipEntry.getName()).mkdirs();
      } else {
        File parent = new File(parentDirectoryPath + zipEntry.getName()).getParentFile();

        if (parent != null) parent.mkdirs();

        FileOutputStream fileOutputStream = new FileOutputStream(parentDirectoryPath + zipEntry.getName());
        InputStream inputStream = zipFile.getInputStream(zipEntry);
        byte[] buffer = new byte[1024];
        int size = 0;
        while ((size = inputStream.read(buffer)) != -1) {
          fileOutputStream.write(buffer, 0, size);
        }
        fileOutputStream.close();
      }
    }
  }

  /**
   * Unzip a zip file
   *
   * @param file
   * @param parentDirectory
   * @throws IOException
   */
  public static void unzip(File file, File parentDirectory) throws IOException {
    String parentDirectoryPath = parentDirectory.getAbsolutePath();
    unzip(file, parentDirectoryPath);
  }
}