package au.gov.amsa.gt;
   
   import java.io.File;
   import java.io.FileOutputStream;
   import java.io.IOException;
   import java.io.InputStream;
   import java.util.zip.ZipEntry;
   import java.util.zip.ZipInputStream;
   
  public class ZipUtil {
  
      public static void unzip(InputStream is, File folder) {
          byte[] buffer = new byte[1024];
          try {
              // create output directory is not exists
              if (!folder.exists()) {
                  folder.mkdir();
              }
  
              // get the zip file content
              try (ZipInputStream zis = new ZipInputStream(is)) {
                  // get the zipped file list entry
                  ZipEntry entry = zis.getNextEntry();
  
                  while (entry != null) {
  
                      String fileName = entry.getName();
                      File newFile = new File(folder, fileName);
                      // create all non existent folders
                      // else you will hit FileNotFoundException for compressed
                      // folder
                      new File(newFile.getParent()).mkdirs();
  
                      try (FileOutputStream fos = new FileOutputStream(newFile)) {
                          int len;
                          while ((len = zis.read(buffer)) > 0) {
                              fos.write(buffer, 0, len);
                          }
                      }
                      entry = zis.getNextEntry();
                  }
                  zis.closeEntry();
              }
          } catch (IOException e) {
              throw new RuntimeException(e);
          }
      }
  
  }