java根据身份证号码计算年龄的方法（精确到日）

 /*** 根据身份证号码计算年龄** @param psptNo* @return*/public int getAgeByPsptNo(String psptNo) {if (StringUtils.isEmpty(psptNo)) {return 0;}String birthDay = psptNo.substring(6, 14);String time = new SimpleDateFormat("yyyy-MM-dd").format(new Date());String yearStr = time.split("-")[0];String monthStr = time.split("-")[1];String dayStr = time.split("-")[2];String yearBirthStr = birthDay.substring(0, 4);String monthBirthStr = birthDay.substring(4, 6);String dayBirthStr = birthDay.substring(6);int year = Integer.valueOf(yearStr);int yearBirth = Integer.valueOf(yearBirthStr);if (year - yearBirth <= 0) {return 0;}int age = year - yearBirth;int month = Integer.valueOf(monthStr);int monthBirth = Integer.valueOf(monthBirthStr);if (month - monthBirth > 0) {return age;}if (month - monthBirth < 0) {return --age;}int day = Integer.valueOf(dayStr);int dayBirth = Integer.valueOf(dayBirthStr);if (day - dayBirth >= 0) {return age;}return --age;}