Java实现的日期处理类完整实例
本文实例讲述了Java实现的日期处理类。分享给大家供大家参考，具体如下：
开发中常常要使用日期，先小结如下，以备后用。
importjava.text.ParseException;
importjava.text.SimpleDateFormat;
importjava.util.Calendar;
importjava.util.Date;
publicclassFormatTime{
privatefinalstaticSimpleDateFormatsdf=newSimpleDateFormat("yyyyMMdd");
privatefinalstaticSimpleDateFormatsdfymdhm=newSimpleDateFormat("yyyyMMddHHmmss");
privatefinalstaticSimpleDateFormatsdfymdhms=newSimpleDateFormat("yyyy-MM-ddHH:mm:ss");
/**
*
*@Title:getCurrentDay
*@Description:TODO获取当天时间(20161109)
*@return
*/
publicstaticStringgetCurrentDay(){
returnsdf.format(newDate());
}
/**
*
*@Title:fTime2
*@Description:TODO获取time这个日期以前dayAgo天的日期
*@return
*/
publicstaticStringfTime(Stringtime,intdayAgo){
Datedate=null;
try{
date=sdf.parse(time);
}catch(ParseExceptione){
thrownewRuntimeException(e);
}
Calendarcalendar=Calendar.getInstance();
calendar.setTime(date);
if(dayAgo>0){
calendar.add(Calendar.DAY_OF_MONTH,-dayAgo);//前15天数据
date=calendar.getTime();
calendar.setTime(date);
}
intyear=calendar.get(Calendar.YEAR);
intmonth=calendar.get(Calendar.MONTH)+1;
intday=calendar.get(Calendar.DAY_OF_MONTH);
Stringmon="";
Stringd="";
if(month<10){
mon="0"+month;
}else{
mon=month+"";
}
if(day<10){
d="0"+day;
}else{
d=""+day;
}
Stringret=year+""+mon+""+d;
returnret;
}
/**
*
*@Title:fTime2
*@Description:TODO获取time这个日期以后dayAfter天的日期
*@return
*/
publicstaticStringfTime2(Stringtime,intdayAfter){
Datedate=null;
try{
date=sdf.parse(time);
}catch(ParseExceptione){
thrownewRuntimeException(e);
}
Calendarcalendar=Calendar.getInstance();
calendar.setTime(date);
if(dayAfter>0){
calendar.add(Calendar.DAY_OF_MONTH,+dayAfter);//后15天数据
date=calendar.getTime();
calendar.setTime(date);
}
intyear=calendar.get(Calendar.YEAR);
intmonth=calendar.get(Calendar.MONTH)+1;
intday=calendar.get(Calendar.DAY_OF_MONTH);
Stringmon="";
Stringd="";
if(month<10){
mon="0"+month;
}else{
mon=month+"";
}
if(day<10){
d="0"+day;
}else{
d=""+day;
}
Stringret=year+""+mon+""+d;
returnret;
}
/**
*
*@Title:getDefaultTime
*@Description:TODO获取昨天的日期
*@return
*/
publicstaticStringgetDefaultTime(){
Calendarcalendar=Calendar.getInstance();
calendar.add(Calendar.DAY_OF_MONTH,-1);//前1天
Datedate=calendar.getTime();
Stringtime=sdf.format(date);
returntime;
}
/**
*
*@Title:getSunday
*@Description:TODO获取最近一个星期天
*@return
*/
publicstaticStringgetSunday(){
SimpleDateFormatf=newSimpleDateFormat("yyyyMMdd");
Calendarc=Calendar.getInstance();
c.set(Calendar.DAY_OF_WEEK,Calendar.SUNDAY);
returnf.format(c.getTime());
}
/**
*
*@Title:getMonthFirstDay
*@Description:TODO获取本月第一天
*@return
*/
publicstaticStringgetCurrentMonthFirstDay(){
Calendarcal_1=Calendar.getInstance();//获取当前日期
cal_1.add(Calendar.MONTH,0);
cal_1.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天
StringfirstDay=sdf.format(cal_1.getTime());
returnfirstDay;
}
/**
*
*@Title:getMonthFirstDay
*@Description:TODO获取上月第一天
*@return
*/
publicstaticStringgetPreviousMonthFirstDay(){
//获取当前月第一天：
Calendarc=Calendar.getInstance();
c.add(Calendar.MONTH,-1);
c.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天
Stringfirst=sdf.format(c.getTime());
returnfirst;
}
/**
*
*@Title:getMonthFirstDay
*@Description:TODO获取上月最后一天
*@return
*/
publicstaticStringgetPreviousMonthLastDay(){
//获取当前月最后一天
Calendarca=Calendar.getInstance();
ca.set(Calendar.DAY_OF_MONTH,0);//
StringlastDay=sdf.format(ca.getTime());
returnlastDay;
}
/**
*
*@Title:getCurrentMonthLastDay
*@Description:TODO获取指定时间最后一天
*@return
*/
publicstaticStringgetCurrentMonthLastDay(Stringtime){
Datedate=null;
try{
date=sdf.parse(time);
}catch(ParseExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
//获取当前月最后一天
Calendarca=Calendar.getInstance();
ca.setTime(date);
ca.set(Calendar.DAY_OF_MONTH,
ca.getActualMaximum(Calendar.DAY_OF_MONTH));//
StringlastDay=sdf.format(ca.getTime());
returnlastDay;
}
/***
*
*@Title:getCurrentWeekDay
*@Description:TODO获取本周周一
*/
publicstaticStringgetCurrentMonday(){
Calendarcal=Calendar.getInstance();
cal.setFirstDayOfWeek(Calendar.MONDAY);//将每周第一天设为星期一，默认是星期天
cal.add(Calendar.DATE,0);
cal.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY);
Stringmonday=sdf.format(cal.getTime());
returnmonday;
}
/***
*
*@Title:getPreviousSunday
*@Description:TODO获取上周周日
*/
publicstaticStringgetPreviousSunday(){
Calendarcal=Calendar.getInstance();
cal.setFirstDayOfWeek(Calendar.MONDAY);//将每周第一天设为星期一，默认是星期天
cal.add(Calendar.DATE,-1*7);
cal.set(Calendar.DAY_OF_WEEK,Calendar.SUNDAY);
Stringsunday=sdf.format(cal.getTime());
returnsunday;
}
/**
*
*@Title:getMiniSencond
*@Description:TODO将日期转换为毫秒数
*@paramstr
*@return
*/
publicstaticStringgetMiniSencond(Stringstr){
longmillionSeconds=0;
try{
millionSeconds=sdfymdhm.parse(str).getTime();//毫秒
}catch(ParseExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
returnmillionSeconds+"";
}
/**
*
*@Title:getDateSencond
*@Description:TODO将日期转换为毫秒数
*@paramstr
*@return
*/
publicstaticlonggetDateSencond(Stringstr){
longmillionSeconds=0;
try{
millionSeconds=sdfymdhms.parse(str).getTime();//毫秒
}catch(ParseExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
returnmillionSeconds;
}
/**
*计算日期相差天数
*@paramstr1
*@paramstr2
*@return
*/
publicstaticintgetDistanceOfTwoDate(Stringstr1,Stringstr2){
intresult=0;
try{
Datedate1=sdf.parse(str1);
Datedate2=sdf.parse(str2);
CalendaraCalendar=Calendar.getInstance();
aCalendar.setTime(date1);
intday1=aCalendar.get(Calendar.DAY_OF_YEAR);
aCalendar.setTime(date2);
intday2=aCalendar.get(Calendar.DAY_OF_YEAR);
result=day1-day2;
}catch(Exceptione){
e.printStackTrace();
}
returnresult;
}
/**
*
*@Title:long2Date
*@Description:TODOlong转日期(年-月-日时-分-秒)
*@paramtimestamp
*@return
*/
publicstaticStringlongToDate(Longmsecond){
Datedate=newDate(msecond);
returnsdfymdhms.format(date);
}
}
PS：这里再为大家推荐几款关于日期与天数计算的在线工具供大家使用：
在线日期/天数计算器：
http://tools.jb51.net/jisuanqi/date_jisuanqi
在线万年历日历：
http://tools.jb51.net/bianmin/wannianli
在线阴历/阳历转换工具：
http://tools.jb51.net/bianmin/yinli2yangli
更多关于java相关内容感兴趣的读者可查看本站专题：《java日期与时间操作技巧汇总》、《Java数据结构与算法教程》、《Java操作DOM节点技巧总结》和《Java缓存操作技巧汇总》
希望本文所述对大家java程序设计有所帮助。