Md5加密,Base64的加密和Base64的解密：

/**
 * MD5加密，Base64的加密和解密
 * @author knot
 *
 */
public class enCrypt_And_deCryptUtil {

    /***
     * MD5加密
     * @param str 需要加密的引數
     * @return
     * @throws Exception
     */
    public static String encrypt_MD5(String str) throws Exception {
        MessageDigest md = MessageDigest.getInstance("MD5"
 
);
        md.update(str.getBytes());
        return new BigInteger(1,md.digest()).toString(16);
    }

    /***
     * Base64加密
     * @param str 需要加密的引數
     * @return
     * @throws Exception
     */
    public static String encrypt_Base64(String str) throws Exception {
        String result = Base64.getEncoder().encodeToString(str.getBytes("UTF-8"
 
));
        return result;
    }

    /***
     * Base64解密
     * @param str 需要解密的引數
     * @return
     * @throws Exception
     */
    public static String decrypt_Base64(String str) throws Exception {
        byte[] asBytes = Base64.getDecoder().decode(str);
        String result = new String(asBytes,"UTF-8"
 
);
        return result;
    }

}