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;
         }
     }