Java 3DES 加密 解密 示例

import java.io.IOException;    import java.security.Key;    import java.security.NoSuchAlgorithmException;    import java.security.SecureRandom;    import javax.crypto.Cipher;    import javax.crypto.KeyGenerator;    import sun.misc.BASE64Decoder;    import sun.misc.BASE64Encoder;        @SuppressWarnings("restriction")    public class TripleDESTest {            /**        * 根据参数生成Key;        *         * @param strKey        */        private Key getKey(String strKey) {            Key key = null;            try {                KeyGenerator _generator = KeyGenerator.getInstance("DES");                _generator.init(new SecureRandom(strKey.getBytes()));                key = _generator.generateKey();                _generator = null;            } catch (NoSuchAlgorithmException e) {                e.printStackTrace();            }            return key;        }            /**        * 获得一次3DES加密后的密文        *         * @param        * @return strMi        */        public String getEncString(String strMing, String strKey) {            byte[] byteMi = null;            byte[] byteMing = null;            String strMi = "";            Key key = getKey(strKey);            BASE64Encoder encoder = new BASE64Encoder();            try {                byteMing = strMing.getBytes("utf-8");                byteMi = getEncCode(byteMing, key);                strMi = encoder.encode(byteMi);            } catch (Exception e) {                e.printStackTrace();            } finally {                encoder = null;                byteMi = null;                byteMing = null;            }            return strMi;        }            /**        * 获得两次3DES加密后的密文        *         * @param        * @return strMi        */        public String getTwiceEncString(String strMing, String strKey) {            return getEncString(getEncString(strMing, strKey), strKey);        }            /**        * 获得一次3DES解密后的明文        *         * @param        * @return strMing        */        public String getDecString(String strMi, String strKey) {            BASE64Decoder base64Decoder = new BASE64Decoder();            byte[] byteMing = null;            byte[] byteMi = null;            String strMing = "";            Key key = getKey(strKey);            try {                byteMi = base64Decoder.decodeBuffer(strMi);                byteMing = getDecCode(byteMi, key);                strMing = new String(byteMing, "utf-8");            } catch (IOException e) {                e.printStackTrace();            } finally {                base64Decoder = null;                byteMing = null;                byteMi = null;            }            return strMing;        }            /**        * 获得两次3DES解密后的明文        *         * @param        * @return strMing        */        public String getTwiceDecString(String strMi, String strKey) {            return getDecString(getDecString(strMi, strKey), strKey);        }            /**        * 获得一次3DES加密后的密文        *         * @param byts        * @return        */        private byte[] getEncCode(byte[] byts, Key key) {            byte[] byteFina = null;            Cipher cipher;            try {                cipher = Cipher.getInstance("DES");                cipher.init(Cipher.ENCRYPT_MODE, key);                byteFina = cipher.doFinal(byts);            } catch (Exception e) {                e.printStackTrace();            } finally {                cipher = null;            }            return byteFina;        }            /**        * 获得一次3DES解密后的明文        *         * @param bytd        * @return        */        private byte[] getDecCode(byte[] bytd, Key key) {            byte[] byteFina = null;            Cipher cipher = null;            try {                cipher = Cipher.getInstance("DES");                cipher.init(Cipher.DECRYPT_MODE, key);                byteFina = cipher.doFinal(bytd);            } catch (Exception e) {                e.printStackTrace();            } finally {                cipher = null;            }            return byteFina;        }            public static void main(String[] args) {            TripleDESTest td = new TripleDESTest();            Key k = td.getKey("Key");            System.out.println("获得的密钥key是:" + k);            String encyStr = td.getEncString("Test", "Key");            System.out.println("一次加密后的密文是:" + encyStr);            String decyStr = td.getDecString(encyStr, "Key");            System.out.println("一次解密后的明文是:" + decyStr);            encyStr = td.getTwiceEncString("Test", "Key");            System.out.println("两次加密后的密文是:" + encyStr);            decyStr = td.getTwiceDecString(encyStr, "Key");            System.out.println("两次解密后的明文是:" + decyStr);        }        }