void encode(File enfile, File defile) throws Exception {

		String Algorithm = "DES";

		byte[] key = "cnmmlgb!".getBytes();

		SecretKey deskey = new SecretKeySpec(key, Algorithm);

		Cipher c = Cipher.getInstance(Algorithm);

		//c.init(Cipher.ENCRYPT_MODE, deskey);//加密模式

		c.init(Cipher.DECRYPT_MODE, deskey);//解密模式

		byte[] buffer = new byte[100 * 1024];

		FileInputStream in = new FileInputStream(enfile);

		OutputStream out = new FileOutputStream(defile);

		CipherInputStream cin = new CipherInputStream(in, c);

		int i;

		while ((i = cin.read(buffer)) != -1) {

			out.write(buffer, 0, i);

		}

		out.close();

		cin.close();

	}