how to gzip unzip in java (eclipse)

[Sarvesh Kumar Singh]

Hi,

 how to gzip unzip in java (eclipse)

Sarvesh Kumar singh

[Neo]

Java has very good inbuilt foundation classes for this... 

This is an example.

public class FolderZiper {
  public static void main(String[] a) throws Exception {
    zipFolder("c:\\a", "c:\\a.zip");
  }

  static public void zipFolder(String srcFolder, String destZipFile) throws Exception {
    ZipOutputStream zip = null;
    FileOutputStream fileWriter = null;

    fileWriter = new FileOutputStream(destZipFile);
    zip = new ZipOutputStream(fileWriter);

    addFolderToZip("", srcFolder, zip);
    zip.flush();
    zip.close();
  }

  static private void addFileToZip(String path, String srcFile, ZipOutputStream zip)
      throws Exception {

    File folder = new File(srcFile);
    if (folder.isDirectory()) {
      addFolderToZip(path, srcFile, zip);
    } else {
      byte[] buf = new byte[1024];
      int len;
      FileInputStream in = new FileInputStream(srcFile);
      zip.putNextEntry(new ZipEntry(path + "/" + folder.getName()));
      while ((len = in.read(buf)) > 0) {
        zip.write(buf, 0, len);
      }
    }
  }

  static private void addFolderToZip(String path, String srcFolder, ZipOutputStream zip)
      throws Exception {
    File folder = new File(srcFolder);

    for (String fileName : folder.list()) {
      if (path.equals("")) {
        addFileToZip(folder.getName(), srcFolder + "/" + fileName, zip);
      } else {
        addFileToZip(path + "/" + folder.getName(), srcFolder + "/" + fileName, zip);
      }
    }
  }
}

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[Shailendra shail]

Thanks neo. Very good answer. I would love to use java.nio package for ziping unziping added in jdk-7. You can find it on net as well. I can put one example here but I don't have much access of internet. I think nishant will have some POC on it.

[Neo]

Don't have right now... but will try to throw something in the evening...