public final class DesUtils {    private static final String DES = "DES";    private static final String KEY = "4YztMHI7PsT4rLZN";    private DesUtils() {}    private static byte[] encrypt(byte[] src, byte[] key) throws Exception {        SecureRandom sr = new SecureRandom();        DESKeySpec dks = new DESKeySpec(key);        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);        SecretKey secretKey = keyFactory.generateSecret(dks);        Cipher cipher = Cipher.getInstance(DES);        cipher.init(Cipher.ENCRYPT_MODE, secretKey, sr);        return cipher.doFinal(src);    }    private static byte[] decrypt(byte[] src, byte[] key) throws Exception {        SecureRandom sr = new SecureRandom();        DESKeySpec dks = new DESKeySpec(key);        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);        SecretKey secretKey = keyFactory.generateSecret(dks);        Cipher cipher = Cipher.getInstance(DES);        cipher.init(Cipher.DECRYPT_MODE, secretKey, sr);        return cipher.doFinal(src);    }    private static String byte2hex(byte[] b) {        String hs = "";        String temp = "";        for (int n = 0; n < b.length; n++) {            temp = (java.lang.Integer.toHexString(b[n] & 0XFF));            if (temp.length() == 1)                hs = hs + "0" + temp;            else                hs = hs + temp;        }        return hs.toUpperCase();    }    private static byte[] hex2byte(byte[] b) {        if ((b.length % 2) != 0)            throw new IllegalArgumentException("length not even");        byte[] b2 = new byte[b.length / 2];        for (int n = 0; n < b.length; n += 2) {            String item = new String(b, n, 2);            b2[n / 2] = (byte) Integer.parseInt(item, 16);        }        return b2;    }    private static String decode(String src, String key) {        String decryptStr = "";        try {            byte[] decrypt = decrypt(hex2byte(src.getBytes()), key.getBytes());            decryptStr = new String(decrypt);        } catch (Exception e) {            e.printStackTrace();        }        return decryptStr;    }    private static String encode(String src, String key){        byte[] bytes = null;        String encryptStr = "";        try {            bytes = encrypt(src.getBytes(), key.getBytes());        } catch (Exception ex) {            ex.printStackTrace();        }        if (bytes != null)            encryptStr = byte2hex(bytes);        return encryptStr;    }    /**     * 解密     */    public static String decode(String src) {        return decode(src, KEY);    }    /**     * 加密     */    public static String encode(String src) {        return encode(src, KEY);    }}

测试

public static void main(String[] args) {    String ss = "uu123@#$";    String encodeSS = encode(ss);    System.out.println(encodeSS);    String decodeSS = decode(encodeSS);    System.out.println(decodeSS);}result:    6EA84873A948B299936006D75B7CA819    uu123@#$