Java日期工具類的封裝詳解

第Java日期工具類的封裝詳解publicstaticDateaddDay(Datedate,intadds){

Calendarcal=Calendar.getInstance();

cal.setTime(date);

cal.add(Calendar.DATE,adds);

returncal.getTime();

*日期字符串年月加減+天

*@paramdate日期字符串

*@paramadds天數(shù)

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:06

*@since1.0.0

publicstaticStringaddDay(Stringdate,intadds){

Stringfmt=checkFmtByPattern(date);

Dater=addDay(parse(date),adds);

returnformat(r,fmt);

*日期年月加減+月

*@paramdate日期

*@paramadds天數(shù)

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:06

*@since1.0.0

publicstaticDateaddMonth(Datedate,intadds){

Calendarcal=Calendar.getInstance();

cal.setTime(date);

cal.add(Calendar.MONTH,adds);

returncal.getTime();

*日期年月加減+月

*@paramdate日期字符串

*@paramadds天數(shù)

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:06

*@since1.0.0

publicstaticStringaddMonth(Stringdate,intadds){

Stringfmt=checkFmtByPattern(date);

Dater=addMonth(parse(date),adds);

returnformat(r,fmt);

*日期年月加減+年

*@paramdate日期

*@paramadds天數(shù)

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:06

*@since1.0.0

publicstaticDateaddYear(Datedate,intadds){

Calendarcal=Calendar.getInstance();

cal.setTime(date);

cal.add(Calendar.YEAR,adds);

returncal.getTime();

*日期年月加減+年

*@paramdate日期字符串

*@paramadds天數(shù)

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:06

*@since1.0.0

publicstaticStringaddYear(Stringdate,intadds){

Stringfmt=checkFmtByPattern(date);

Dater=addYear(parse(date),adds);

returnformat(r,fmt);

*返回當前日期

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:10

*@since1.0.0

publicstaticDategetNowDate(){

returnnewDate();

*返回當前日期字符串

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:10

*@since1.0.0

publicstaticStringgetNowStr(Stringformat){

returngetSdf(format).format(newDate());

*返回當前年

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:10

*@since1.0.0

publicstaticintgetNowYear(){

Calendarcalendar=Calendar.getInstance();

returncalendar.get(Calendar.YEAR);

*返回當前月

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:10

*@since1.0.0

publicstaticintgetNowMonth(){

Calendarcalendar=Calendar.getInstance();

returncalendar.get(Calendar.MONTH);

*獲取今天是多少號

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:10

*@since1.0.0

publicstaticintgetNowDay(){

Calendarcalendar=Calendar.getInstance();

returncalendar.get(Calendar.DAY_OF_MONTH);

*返回當前日期是今年的第幾天

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:10

*@since1.0.0

publicstaticintgetNowDayOfYear(){

Calendarcalendar=Calendar.getInstance();

returncalendar.get(Calendar.DAY_OF_YEAR);

*獲取今天是星期幾

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2111:10

*@since1.0.0

publicstaticintgetNowDayOfWeek(){

Calendarcalendar=Calendar.getInstance();

returncalendar.get(Calendar.DAY_OF_WEEK)-1;

*獲取日期字符串的某一個時間單位

*@paramdateStr日期字符串

*@paramformat日期格式化模式默認：yyyy/MM/dd

*@paramunit獲取的日期單位

*@returnint

*@authorcompass

*@date2025/9/14

*@since1.0.0

publicstaticintgetDateUnit(StringdateStr,Stringformat,DateTools.DateTypeunit){

inttype=unit.getValue();

format=StringUtils.isNotBlank(format)format:DEFAULT_DATETIME_FORMAT;

SimpleDateFormatsdf=newSimpleDateFormat(format);

CalendarstartCalendar=Calendar.getInstance();

DatedateTime=null;

try{

dateTime=sdf.parse(dateStr);

}catch(ParseExceptione){

e.printStackTrace();

thrownewRuntimeException("日期格式錯誤");

startCalendar.setTime(dateTime);

intyear=startCalendar.get(Calendar.YEAR);

intmonth=startCalendar.get(Calendar.MONTH)+1;

intday=startCalendar.get(Calendar.DAY_OF_MONTH);

inthour=startCalendar.get(Calendar.HOUR_OF_DAY);

intminute=startCalendar.get(Calendar.MINUTE);

intsecond=startCalendar.get(Calendar.SECOND);

switch(type){

case1:

returnyear;

case2:

returnmonth;

case3:

returnday;

case4:

returnhour;

case5:

returnminute;

case6:

returnsecond;

default:

thrownewRuntimeException("日期單位不正確");

*計算距離生日還有多少天

*@paramdate：生日日期

*@paramformat：日期格式默認：yyyy-MM-dd

publicstaticintgetBirthDay(Stringdate,String...format){

if(format!=nullformat.length1){

thrownewRuntimeException("日期格式字符串，只支持一個");

intdays=0;

try{

SimpleDateFormatmyFormatter=newSimpleDateFormat(format.length=0"yyyy-MM-dd":format[0]);

StringcliDate=date;

CalendarcToday=Calendar.getInstance();//存今天

CalendarcBirth=Calendar.getInstance();//存生日

cBirth.setTime(myFormatter.parse(cliDate));//設置生日

cBirth.set(Calendar.YEAR,cToday.get(Calendar.YEAR));//修改為本年

if(cBirth.get(Calendar.DAY_OF_YEAR)cToday.get(Calendar.DAY_OF_YEAR)){

//生日已經(jīng)過了，要算明年的了

days=cToday.getActualMaximum(Calendar.DAY_OF_YEAR)-cToday.get(Calendar.DAY_OF_YEAR);

days+=cBirth.get(Calendar.DAY_OF_YEAR);

}else{

//生日還沒過

days=cBirth.get(Calendar.DAY_OF_YEAR)-cToday.get(Calendar.DAY_OF_YEAR);

}catch(ParseExceptione){

e.printStackTrace();

returndays;

*獲取服務器啟動時間

*@returnjava.util.Date

*@authorcompass

*@date2025/10/2114:40

*@since1.0.0

publicstaticDategetServerStartDate(){

longtime=ManagementFactory.getRuntimeMXBean().getStartTime();

returnnewDate(time);

*獲取服務器啟動時間

*@paramformat日期格式默認yyyy-MM-ddHH:mm:ss

*@returnjava.util.Dat