import java.util.UUID;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


public class DES {

    private static final byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };

    /**
     * 
     * @param encryptString 加密内容
     * @param encryptKey 加密key
     * @return
     * @throws Exception
     */
    public static String encryptDES(String encryptString, String encryptKey)
            throws Exception {
        IvParameterSpec zeroIv = new IvParameterSpec(iv);
        SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
        String tmp = Base64.encodeBytes(encryptString.getBytes("UTF-8"));
        byte[] encryptedData = cipher.doFinal(tmp.getBytes("UTF-8"));
        return Base64.encodeBytes(encryptedData);
    }
    
    /**
     * 
     * @param decryptString 解密内容
     * @param encryptKey 解密key
     * @return
     * @throws Exception
     */
    public static String decryptDES(String decryptString,String encryptKey)throws Exception {
        IvParameterSpec zeroIv = new IvParameterSpec(iv);
        SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
        byte[] decryptBytes = cipher.doFinal(Base64.decode(decryptString));
        String tmp = new String(decryptBytes,"UTF-8");
        return new String(Base64.decode(tmp));
    }
    
    public static String getKey(){
        String p = UUID.randomUUID().toString();
        return SHA1.Encrypt(p).substring(0, 8);
    }
    
}

public static void testDES() throws Exception{
    
        String content = "AES加密";
        String key = DES.getKey();
        String a = DES.encryptDES(content, key);
        System.out.println("DES Encrypt..." + a);
        String b = DES.decryptDES(a, key);
        System.out.println("DES decrypt..." + b);
}

DES Encrypt...93koM7boCXsNrH91Y0MDJA==
DES decrypt...AES加密