// Questi sono i file da includere nello zip
    String[] filenames = new String[]{"filename1", "filename2"};
    
    // Crea il buffer per leggere i file
    byte[] buf = new byte[1024];
    
    try {
        // Crea il file zip
        String outFilename = "outfile.zip";
        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(outFilename));
    
        // Comprimi i file
        for (int i=0; i<filenames.length; i++) {
            FileInputStream in = new FileInputStream(filenames[i]);
    
            out.putNextEntry(new ZipEntry(filenames[i]));
    
		// Trasferisci i bytes dal file al file zip
            int len;
            while ((len = in.read(buf)) > 0) {
                out.write(buf, 0, len);
            }
    
            // Completa 
            out.closeEntry();
            in.close();
        }
    
        // Completa il file zip
        out.close();
    } catch (IOException e) {
    }