Crear un archivo Zip en Java

Como crear archivos comprimidos Zip usando las librerías nativas de Java.

// These are the files to include in the ZIP file

    String[] filenames = new String[]{"filename1", "filename2"};

    // Create a buffer for reading the files

    byte[] buf = new byte[1024];

    try {

        // Create the ZIP file

        String outFilename = "outfile.zip";

        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(outFilename));

        // Compress the files

        for (int i=0; i

            FileInputStream in = new FileInputStream(filenames[i]);

            // Add ZIP entry to output stream.

            out.putNextEntry(new ZipEntry(filenames[i]));

            // Transfer bytes from the file to the ZIP file

            int len;

            while ((len = in.read(buf)) > 0) {

                out.write(buf, 0, len);

            }

            // Complete the entry

            out.closeEntry();

            in.close();

        }

        // Complete the ZIP file

        out.close();

    } catch (IOException e) {

    }