Blob二进制转base64

public static String blobToBase64(Blob blob) {
        String result = "";
        if (null != blob) {
            try {
                InputStream msgContent = blob.getBinaryStream();
                ByteArrayOutputStream output = new ByteArrayOutputStream();
                byte[] buffer = new byte[100];
                int n = 0;
                while (-1 != (n = msgContent.read(buffer))) {
                    output.write(buffer, 0, n);
                }
                result = new BASE64Encoder().encode(output.toByteArray());
                output.close();
            } catch (SQLException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
            return result;
        } else {
            return null;
        }
    }

/**
     * 根据身份证号计算年龄
     * @param pensonnelIdCard
     * @return
     */
    public Integer getPersonAgeFromIdCard(String pensonnelIdCard) {
        
        //截取身份证中出行人出生日期中的年、月、日
        Integer personYear = Integer.parseInt(pensonnelIdCard.substring(6, 10));
        Integer personMonth = Integer.parseInt(pensonnelIdCard.substring(10, 12));
        Integer personDay = Integer.parseInt(pensonnelIdCard.substring(12, 14));
        
        Calendar cal = Calendar.getInstance();
        // 得到当前时间的年、月、日
        Integer yearNow = cal.get(Calendar.YEAR);
        Integer monthNow = cal.get(Calendar.MONTH) + 1;
        Integer dayNow = cal.get(Calendar.DATE);
        
        // 用当前年月日减去生日年月日
        Integer yearMinus = yearNow - personYear;
        Integer monthMinus = monthNow - personMonth;
        Integer dayMinus = dayNow - personDay;
 
        Integer age = yearMinus; //先大致赋值
        
        if (yearMinus == 0) { //出生年份为当前年份 
            age = 0;
        }else{ //出生年份大于当前年份
            if (monthMinus < 0) {//出生月份小于当前月份时，还没满周岁
                age = age - 1;
            }
            if (monthMinus == 0) {//当前月份为出生月份时，判断日期
                if (dayMinus < 0) {//出生日期小于当前月份时，没满周岁
                   age = age - 1;
                }
            } 
        }
        return age;
    }