The java.util.zip Package for Working with ZIP Files in Java

Use the java.util.zip package for reading and writing ZIP files, including compressing and decompressing file entries.

Source Code

// Compressing a file
try (ZipOutputStream zos = new ZipOutputStream(new FileOutputStream("archive.zip"))) {
    ZipEntry entry = new ZipEntry("filename.txt");
    zos.putNextEntry(entry);
    byte[] data = "Hello, World!".getBytes();
    zos.write(data, 0, data.length);
    zos.closeEntry();
} catch (IOException e) {
    e.printStackTrace();
}

// Decompressing a file
try (ZipInputStream zis = new ZipInputStream(new FileInputStream("archive.zip"))) {
    ZipEntry entry = zis.getNextEntry();
    while (entry != null) {
        System.out.println("Extracting: " + entry.getName());
        FileOutputStream fos = new FileOutputStream(entry.getName());
        int len;
        byte[] buffer = new byte[1024];
        while ((len = zis.read(buffer)) > 0) {
            fos.write(buffer, 0, len);
        }
        fos.close();
        entry = zis.getNextEntry();
    }
    zis.closeEntry();
} catch (IOException e) {
    e.printStackTrace();
}