先来个C#版的：

public class DESHelper    {        /// 
        /// DES加密算法        /// 
        /// 要加密的字符串        /// 加密码Key        /// 
     
      正确返回加密后的结果，错误返回源字符串
             public static string ToDESEncrypt(string encryptString, string sKey)        {            try            {                byte[] keyBytes = Encoding.UTF8.GetBytes(sKey);                byte[] keyIV = keyBytes;                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);                DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();                // java 默认的是ECB模式，PKCS5padding；c#默认的CBC模式，PKCS7padding 所以这里我们默认使用ECB方式                desProvider.Mode = CipherMode.ECB;                MemoryStream memStream = new MemoryStream();                CryptoStream crypStream = new CryptoStream(memStream, desProvider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);                crypStream.Write(inputByteArray, 0, inputByteArray.Length);                crypStream.FlushFinalBlock();                return Convert.ToBase64String(memStream.ToArray());            }            catch            {                return encryptString;            }        }        /// 
        /// DES解密算法        /// 
        /// 要解密的字符串        /// 加密Key        /// 
     
      正确返回加密后的结果，错误返回源字符串
             public static string ToDESDecrypt(string decryptString, string sKey)        {            byte[] keyBytes = Encoding.UTF8.GetBytes(sKey);            byte[] keyIV = keyBytes;            byte[] inputByteArray = Convert.FromBase64String(decryptString);            DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();            // java 默认的是ECB模式，PKCS5padding；c#默认的CBC模式，PKCS7padding 所以这里我们默认使用ECB方式            desProvider.Mode = CipherMode.ECB;            MemoryStream memStream = new MemoryStream();            CryptoStream crypStream = new CryptoStream(memStream, desProvider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);            crypStream.Write(inputByteArray, 0, inputByteArray.Length);            crypStream.FlushFinalBlock();            return Encoding.Default.GetString(memStream.ToArray());        }    }

 

再来个Java版的

public class DESHelper {	private byte[] desKey;	public DES(String desKey) {		this.desKey = desKey.getBytes();	}	public byte[] desEncrypt(byte[] plainText) throws Exception {		SecureRandom sr = new SecureRandom();		byte rawKeyData[] = desKey;		DESKeySpec dks = new DESKeySpec(rawKeyData);		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");		SecretKey key = keyFactory.generateSecret(dks);		Cipher cipher = Cipher.getInstance("DES");		cipher.init(Cipher.ENCRYPT_MODE, key, sr);		byte data[] = plainText;		byte encryptedData[] = cipher.doFinal(data);		return encryptedData;	}	public byte[] desDecrypt(byte[] encryptText) throws Exception {		SecureRandom sr = new SecureRandom();		byte rawKeyData[] = desKey;		DESKeySpec dks = new DESKeySpec(rawKeyData);		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");		SecretKey key = keyFactory.generateSecret(dks);		Cipher cipher = Cipher.getInstance("DES");		cipher.init(Cipher.DECRYPT_MODE, key, sr);		byte encryptedData[] = encryptText;		byte decryptedData[] = cipher.doFinal(encryptedData);		return decryptedData;	}	public String encrypt(String input) throws Exception {		return base64Encode(desEncrypt(input.getBytes()));	}	public String decrypt(String input) throws Exception {		byte[] result = base64Decode(input);		return new String(desDecrypt(result));	}	public static String base64Encode(byte[] s) {		if (s == null)			return null;		BASE64Encoder b = new sun.misc.BASE64Encoder();		return b.encode(s);	}	public static byte[] base64Decode(String s) throws IOException {		if (s == null)			return null;		BASE64Decoder decoder = new BASE64Decoder();		byte[] b = decoder.decodeBuffer(s);		return b;	}	}