@根据出生日期计算年龄(精确到天)

代码块

public class CountAgeUtil {

public static String countAge(String from){

String age = "";

int year = 0;

int month = 0;

int day = 0;

from = from.substring(0, 10).replace("-", "");

int birthYear = Integer.parseInt(from.substring(0, 4));

int birthMonth = Integer.parseInt(from.substring(4, 6))-1;

int birthDay = Integer.parseInt(from.substring(6, 8));

Calendar birthday = new GregorianCalendar(birthYear, birthMonth, birthDay);

if(from == null){

age = age + 0;

} else {

Calendar c1 = new GregorianCalendar(birthYear, birthMonth, birthDay);

Calendar c2 = Calendar.getInstance();

c2.setTime(new Date());

if (c1.after(c2)) {

throw new IllegalArgumentException("生日不能超过当前日期");

}

int from_year = c1.get(Calendar.YEAR);

int from_month = c1.get(Calendar.MONTH)+1;

int from_day = c1.get(Calendar.DAY_OF_MONTH);

int MaxDayOfMonth = c1.getActualMaximum(Calendar.DAY_OF_MONTH);

int to_year = c2.get(Calendar.YEAR);

int to_month = c2.get(Calendar.MONTH)+1;

int to_day = c2.get(Calendar.DAY_OF_MONTH);

year = to_year - from_year;

if(to_month - from_month>0){

month = to_month -from_month;

if(to_day - from_day < 0){

month = month - 1;

day = to_day -from_day + MaxDayOfMonth;

} else {

day= to_day -from_day;

}

}else if(to_month - from_month==0){

if(to_day - from_day < 0){

--year;

month = 11;

day = to_day -from_day + MaxDayOfMonth;

} else {

day= to_day -from_day;

}

}else if(to_month-from_month<0){

--year;

month = to_month -from_month+12;

if(to_day - from_day < 0){

month = month - 1;

day = to_day -from_day + MaxDayOfMonth;

} else {

day= to_day -from_day;

}

}

age=age + year + "岁"+month + "个月" + day + "天";

}

return age;

}

}

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