Java编程时间日期API实例解析
本文实例主要是关于Java8中的新特性，时间日期api的相关实例，具体如下：
packagecom.effective.common.base.date;
importjava.time.Instant;
importjava.time.LocalDate;
importjava.time.LocalDateTime;
importjava.time.LocalTime;
importjava.time.Period;
importjava.time.ZoneId;
importjava.time.format.DateTimeFormatter;
importjava.time.temporal.ChronoUnit;
importjava.util.Date;
/**
*日期工具类
*@authoryanweiqi
*@since2016-5-6
*
*/
publicclassLocalDateUtils{
privatestaticZoneIdzone=ZoneId.systemDefault();
/**
*字符串转Date
*@paramdate
*@return
*@throwsException
*/
publicstaticDateconvertToDate(Stringdate)throwsException{
LocalDatelocalDate=null;
if(null==date){
thrownewNullPointerException("dateisn'tnull");
}else{
localDate=LocalDate.parse(date);
returnconvertToDate(localDate);
}
}
/**
*字符串转LocalDateTime
*@paramdate
*@returnlocalDateTime
*/
publicstaticLocalDateTimeconvertToLocalDateTime(Stringdate){
LocalDateTimelocalDateTime=null;
if(null==date){
thrownewNullPointerException("dateisn'tnull");
}else{
localDateTime=LocalDateTime.parse(date);
returnlocalDateTime;
}
}
/**
*LocalDate转Date
*@paramlocalDate
*@returnDate
*/
publicstaticDateconvertToDate(LocalDatelocalDate){
Instantinstant=localDate.atStartOfDay().atZone(zone).toInstant();
returnDate.from(instant);
}
/**
*LocalDate转Date
*@paramlocalDateTime
*@returnDate
*/
publicstaticDateconvertToDate(LocalDateTimelocalDateTime){
Instantinstant=localDateTime.atZone(zone).toInstant();
returnDate.from(instant);
}
/**
*Date转LocalDate
*@paramdate
*@returnlocalDate
*/
publicstaticLocalDateconvertToLocalDate(Datedate){
Instantinstant=date.toInstant();
returnconvertToLocalDateTime(instant).toLocalDate();
}
/**
*Date转LocalTime
*@paramdate
*@returnlocalDate
*/
publicstaticLocalTimeconvertToLocalTime(Datedate){
Instantinstant=date.toInstant();
returnconvertToLocalDateTime(instant).toLocalTime();
}
/**
*Date转LocalDatetime
*@paramdate
*@returnlocalDate
*/
publicstaticLocalDateTimeconvertToLocalDateTime(Datedate){
Instantinstant=date.toInstant();
returnconvertToLocalDateTime(instant);
}
/**
*Instant转LocalDateTime
*@paraminstant
*@return
*/
publicstaticLocalDateTimeconvertToLocalDateTime(Instantinstant){
returnLocalDateTime.ofInstant(instant,zone);
}
/**
*LocalDateTime转Instant
*@paramlocalDateTime
*@return
*/
publicstaticInstantconvertToInstant(LocalDateTimelocalDateTime){
returnlocalDateTime.atZone(zone).toInstant();
}
/**
*LocalDate转Instant
*@paramlocalDate
*@return
*/
publicstaticInstantconvertToInstant(LocalDatelocalDate){
returnlocalDate.atStartOfDay(zone).toInstant();
}
/**
*LocalDate转LocalDateTime
*@paramlocalDate
*@returnLocalDateTime
*/
publicstaticLocalDateTimeconvertToLocalDateTime(LocalDatelocalDate){
returnlocalDate.atStartOfDay();
}
/**
*日周期格式化
*@paramlocalDateTime
*@paramformatStyle
*@return
*/
publicstaticStringformatter(LocalDateTimelocalDateTime,StringformatStyle){
returnDateTimeFormatter.ofPattern(formatStyle).format(localDateTime);
}
/**
*设置年
*@paramsourceDate
*@paramyear
*@returnLocalDateTime
*/
publicstaticLocalDateTimesetYear(LocalDateTimesourceDate,Integeryear){
returnsourceDate.withYear(year);
}
/**
*设置月
*@paramsourceDate
*@parammonth
*@returnLocalDateTime
*/
publicstaticLocalDateTimesetMonth(LocalDateTimesourceDate,Integermonth){
returnsourceDate.withMonth(month);
}
/**
*设置天
*@paramsourceDate
*@parammonth
*@returnLocalDateTime
*/
publicstaticLocalDateTimesetDayOfMonth(LocalDateTimesourceDate,IntegerdayOfMonth){
returnsourceDate.withDayOfMonth(dayOfMonth);
}
/**
*设置小时
*@paramsourceDate
*@paramhour
*@return
*/
publicstaticLocalDateTimesetHour(LocalDateTimesourceDate,Integerhour){
returnsourceDate.withHour(hour);
}
/**
*设置分钟
*@paramsourceDate
*@paramminute
*@return
*/
publicstaticLocalDateTimesetMinute(LocalDateTimesourceDate,Integerminute){
returnsourceDate.withMinute(minute);
}
/**
*设置秒
*@paramsourceDate
*@paramsecond
*@return
*/
publicstaticLocalDateTimesetSecond(LocalDateTimesourceDate,Integersecond){
returnsourceDate.withSecond(second);
}
/**
*修改年月日
*@paramsourceDate
*@paramyear
*@parammonth
*@paramdayOfMonth
*@return
*/
publicstaticLocalDateTimesetYMD(LocalDateTimesourceDate,Integeryear,Integermonth,IntegerdayOfMonth){
returnsourceDate.withYear(year).withMonth(month).withDayOfMonth(dayOfMonth);
}
/**
*修改时分秒
*@paramsourceDate
*@paramhour
*@paramminute
*@paramsecond
*@return
*/
publicstaticLocalDateTimesetHMS(LocalDateTimesourceDate,Integerhour,Integerminute,Integersecond){
returnsourceDate.withHour(hour).withMinute(minute).withSecond(second);
}
/**
*计算相差的天数
*@parambeginDate
*@paramendDate
*@return
*/
publicstaticintgetInteverDays(LocalDatebeginDate,LocalDateendDate){
Periodperiod=Period.between(beginDate,endDate);
returnperiod.getDays();
}
/**
*日期加减
*@paramnum数量
*@paramunit单位
*@paramLocalDate原日期
*@returnLocalDate增加后的日期
*/
@SuppressWarnings("static-access")
publicstaticLocalDateaddLocalDate(longnum,ChronoUnitunit,finalLocalDatelocalDate){
LocalDateresultDate;
if(num>0){
resultDate=localDate.now().plus(num,unit);
}else{
resultDate=localDate.now().minus(Math.abs(num),unit);
}
returnresultDate;
}
/**
*日期时分秒加
*@paramnum数量
*@paramunit单位
*@paramlocalDateTime原日期
*@returnLocalDateTime增加后的日期
*/
@SuppressWarnings("static-access")
publicstaticLocalDateTimeaddLocalDateTime(longnum,ChronoUnitunit,LocalDateTimelocalDateTime){
LocalDateTimeresultDateTime;
if(num>0){
resultDateTime=localDateTime.now().plus(num,unit);
}else{
resultDateTime=localDateTime.now().minus(Math.abs(num),unit);
}
returnresultDateTime;
}
/**
*时分秒加减
*@paramnum数量
*@paramunit单位
*@paramlocalTime原日期
*@returnLocalDateTime增加后的日期
*/
@SuppressWarnings("static-access")
publicstaticLocalTimeaddLocalTime(longnum,ChronoUnitunit,LocalTimelocalTime){
LocalTimeresultTime;
if(num>0){
resultTime=localTime.now().plus(num,unit);
}else{
resultTime=localTime.now().minus(Math.abs(num),unit);
}
returnresultTime;
}
publicstaticvoidmain(String[]args){
LocalDateTimetime=LocalDateTime.now();
Stringrr=formatter(time,"yyyy-MM-ddHH:mm:ss");
System.out.println(rr);
LocalDateTimetime2=addLocalDateTime(-2,ChronoUnit.HOURS,time);
Stringyy=formatter(time2,"yyyy-MM-ddHH:mm:ss");
System.out.println(yy);
}
代码涉及时间日期类的使用等内容，具有简单注释，大家可自行参考。
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