Base64<4>

public static String decodeInfo(String data)
        {
            String returnmsg = "";
            try
            {
                if(isNotEmpty(data))
                {
                    returnmsg = new String(decode(data),"GBK"); 
                }
            }
            catch (Exception e)
            {
                System.out.println(e.getMessage());
            }
            return returnmsg;
        }
        /**
         *
         * 判断data是否为空，如果为空返回false，不空为true
         * @param data
         * @return boolean
         * 如果有违例，请使用@exception/throws [违例类型]   [违例说明：异常的注释必须说明该异常的含义及什么条件下抛出该
         * @see          [类、类#方法、类#成员]
         */
        public static boolean isNotEmpty(String data)
        {
            boolean flag = false;
            if (null != data)
            {
                data = data.trim();
                //如果传输字符是空串返回false，不空返回true
                flag = "".equals(data)?false:true;
            }
            return flag;
        }       
}

新建一个类进行测试：
public class TestBaseCode {

public static void main(String[] args) {
// TODO Auto-generated method stub
String telephone = Base64.decodeInfo("MTM1MDAzMzAwNjY=");//解密
String userName = Base64.decodeInfo("zfXPyMn6");
System.out.println(telephone);
System.out.println(userName);

String jiamiTelephone = "";
try {
byte[] data ="123465678".getBytes();
jiamiTelephone = new String(Base64.encode(data));//加密
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(jiamiTelephone);

}
}