Java

DES

public static String encrypt(String data, String _key) {
    Key secretKey = generateKey(_key);
    Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
    byte[] bytes = cipher.doFinal(data.getBytes("UTF-8"));
    return new String(encoder.encode(bytes));
}
public static String decrypt(String data, String _key) {
	Key secretKey = generateKey(_key);
	Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
	cipher.init(Cipher.DECRYPT_MODE, secretKey);
	BASE64Decoder decoder = new BASE64Decoder();
	byte[] result = cipher.doFinal(decoder.decodeBuffer(data));
	return new String(result, "UTF-8");
}

其中密钥生成器

private static Key generateKey(final String key) throws Exception {
    DESKeySpec dks = new DESKeySpec(key.getBytes("UTF-8"));
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    return keyFactory.generateSecret(dks);
}

此处提供基于Java 8的Base64工具类：性能好，推荐

private static final Base64.Decoder decoder = Base64.getDecoder();
private static final Base64.Encoder encoder = Base64.getEncoder();
public static String encode(byte[] bytes) { return encoder.encodeToString(bytes); }
public static byte[] decode(String str) { return decoder.decode(str); }

AES