java計算年齡的工具類

整理一篇Java計算年齡的工具類，方便實用

 public static int getAgeByBirth(String birthday) throws ParseException {
            // 格式化传入的时间
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            Date parse = format.parse(birthday);
            int age = 0;
            try {
                Calendar now = Calendar.getInstance();
                now.setTime(new Date()); // 当前时间

                Calendar birth = Calendar.getInstance();
                birth.setTime(parse); // 传入的时间

                //如果传入的时间，在当前时间的后面，返回0岁
                if (birth.after(now)) {
                    age = 0;
                } else {
                    age = now.get(Calendar.YEAR) - birth.get(Calendar.YEAR);
                    if (now.get(Calendar.DAY_OF_YEAR) > birth.get(Calendar.DAY_OF_YEAR)) {
                        age += 1;
                    }
                }
                return age;
            } catch (Exception e) {
                return 0;
            }
        }

 計算從一個時間到另一個時間的年份（年齡）場景：計算出生日期到出發時間的年齡：

  public static int getAgeByBirth(String birthday, String depatureTime) throws ParseException {
        // 格式化传入的时间
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Date parse = format.parse(birthday);
        Date utilDate = format.parse(depatureTime);
        int age = 0;
        try {
            Date date = new java.sql.Date(utilDate.getTime());
            Calendar now = Calendar.getInstance();
            now.setTime(date); // 当前时间

            Calendar birth = Calendar.getInstance();
            birth.setTime(parse); // 传入的时间

            //如果传入的时间，在当前时间的后面，返回0岁
            if (birth.after(now)) {
                age = 0;
            } else {
                age = now.get(Calendar.YEAR) - birth.get(Calendar.YEAR);
                if (now.get(Calendar.DAY_OF_YEAR) > birth.get(Calendar.DAY_OF_YEAR)) {
                    age += 1;
                } else if (now.get(Calendar.DAY_OF_YEAR) == birth.get(Calendar.DAY_OF_YEAR)) {
                    if (now.get(Calendar.DATE) > birth.get(Calendar.DATE)) {
                        age += 1;
                    }
                }
            }
            return age;
        } catch (Exception e) {
            return 0;
        }
    }