java日期处理工具类
本文针对日期处理进行学习使用，主要分为两部分，下面为大家具体介绍一下
第一部分：日期处理基础知识
Date类
作用：最主要的作用就是获得当前时间
将日期转换为标准格式
Datedate=newDate();
SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-ddHH:mm:ss");
Stringstr=sdf.format(date);
System.out.println(“2015-10-1614:59:52”);
将String转换为Date类型
Stringday="2014-6-510:30:30";
SimpleDateFormatd2=newSimpleDateFormat("yyyy-MM-ddHH:mm:ss");
Datedate2=d2.parse(day);
System.out.println(“ThuJun0510:30:30CST2014”);
Calendar类的应用
java.util.Calendar类是一个抽象类，可以通过调用getInstance()静态方法获取一个Calendar对象，此对象已由当前日期时间初始化，即默认代表当前时间
Calendarc=Calendar.getInstance(); intyear=c.get(Calender.YEAR); intmonth=c.get(Calender.MONTH)+1;//获取月份，0表示1月份 intday=c.get(Calender.DAY_OF_MONTH); inthour=c.get(Calender.HOUR_OF_DAY); intminute=c.get(Calender.MINUTE); intsecond=c.get(Calender.SECOND);
比较2个时间相差的月份
SimpleDateFormatformat=newSimpleDateFormat("yyyy-MM-ddhh:mm:ss");
DateTimed1=newDateTime(format.parse("2016-10-3100:00:00"));
DateTimed2=newDateTime(format.parse("2015-1-3100:00:00"));
System.out.println(Math.abs(Months.monthsBetween(d1,d2).getMonths()));
第二部分：日期处理工具类
packagecom.analysys.website.control;
importjava.text.ParseException;
importjava.text.ParsePosition;
importjava.text.SimpleDateFormat;
importjava.util.Calendar;
importjava.util.Date;
importjava.util.GregorianCalendar;
importorg.apache.commons.lang.StringUtils;
importorg.apache.log4j.Logger;
/**
*日期处理工具类
*@authordylan_xu
*@dateMar11,2012
*@modifiedby
*@modifieddate
*@sinceJDK1.6
*@seecom.util.DateUtil
*/
publicclassDateUtil{
//~Staticfields/initializers
//=============================================
privatestaticLoggerlogger=Logger.getLogger(DateUtil.class);
privatestaticStringdefaultDatePattern=null;
privatestaticStringtimePattern="HH:mm";
privatestaticCalendarcale=Calendar.getInstance();
publicstaticfinalStringTS_FORMAT=DateUtil.getDatePattern()+"HH:mm:ss.S";
/**日期格式yyyy-MM字符串常量*/
privatestaticfinalStringMONTH_FORMAT="yyyy-MM";
/**日期格式yyyy-MM-dd字符串常量*/
privatestaticfinalStringDATE_FORMAT="yyyy-MM-dd";
/**日期格式HH:mm:ss字符串常量*/
privatestaticfinalStringHOUR_FORMAT="HH:mm:ss";
/**日期格式yyyy-MM-ddHH:mm:ss字符串常量*/
privatestaticfinalStringDATETIME_FORMAT="yyyy-MM-ddHH:mm:ss";
/**某天开始时分秒字符串常量00:00:00*/
privatestaticfinalStringDAY_BEGIN_STRING_HHMMSS="00:00:00";
/**某天结束时分秒字符串常量23:59:59*/
publicstaticfinalStringDAY_END_STRING_HHMMSS="23:59:59";
privatestaticSimpleDateFormatsdf_date_format=newSimpleDateFormat(DATE_FORMAT);
privatestaticSimpleDateFormatsdf_hour_format=newSimpleDateFormat(HOUR_FORMAT);
privatestaticSimpleDateFormatsdf_datetime_format=newSimpleDateFormat(DATETIME_FORMAT);
//~Methods
//================================================================
publicDateUtil(){
}
/**
*获得服务器当前日期及时间，以格式为：yyyy-MM-ddHH:mm:ss的日期字符串形式返回
*@authordylan_xu
*@dateMar11,2012
*@return
*/
publicstaticStringgetDateTime(){
try{
returnsdf_datetime_format.format(cale.getTime());
}catch(Exceptione){
logger.debug("DateUtil.getDateTime():"+e.getMessage());
return"";
}
}
/**
*获得服务器当前日期，以格式为：yyyy-MM-dd的日期字符串形式返回
*@authordylan_xu
*@dateMar11,2012
*@return
*/
publicstaticStringgetDate(){
try{
returnsdf_date_format.format(cale.getTime());
}catch(Exceptione){
logger.debug("DateUtil.getDate():"+e.getMessage());
return"";
}
}
/**
*获得服务器当前时间，以格式为：HH:mm:ss的日期字符串形式返回
*@authordylan_xu
*@dateMar11,2012
*@return
*/
publicstaticStringgetTime(){
Stringtemp="";
try{
temp+=sdf_hour_format.format(cale.getTime());
returntemp;
}catch(Exceptione){
logger.debug("DateUtil.getTime():"+e.getMessage());
return"";
}
}
/**
*统计时开始日期的默认值
*@authordylan_xu
*@dateMar11,2012
*@return
*/
publicstaticStringgetStartDate(){
try{
returngetYear()+"-01-01";
}catch(Exceptione){
logger.debug("DateUtil.getStartDate():"+e.getMessage());
return"";
}
}
/**
*统计时结束日期的默认值
*@authordylan_xu
*@dateMar11,2012
*@return
*/
publicstaticStringgetEndDate(){
try{
returngetDate();
}catch(Exceptione){
logger.debug("DateUtil.getEndDate():"+e.getMessage());
return"";
}
}
/**
*获得服务器当前日期的年份
*@authordylan_xu
*@dateMar11,2012
*@return
*/
publicstaticStringgetYear(){
try{
returnString.valueOf(cale.get(Calendar.YEAR));
}catch(Exceptione){
logger.debug("DateUtil.getYear():"+e.getMessage());
return"";
}
}
/**
*获得服务器当前日期的月份
*@authordylan_xu
*@dateMar11,2012
*@return
*/
publicstaticStringgetMonth(){
try{
java.text.DecimalFormatdf=newjava.text.DecimalFormat();
df.applyPattern("00;00");
returndf.format((cale.get(Calendar.MONTH)+1));
}catch(Exceptione){
logger.debug("DateUtil.getMonth():"+e.getMessage());
return"";
}
}
/**
*获得服务器在当前月中天数
*@authordylan_xu
*@dateMar11,2012
*@return
*/
publicstaticStringgetDay(){
try{
returnString.valueOf(cale.get(Calendar.DAY_OF_MONTH));
}catch(Exceptione){
logger.debug("DateUtil.getDay():"+e.getMessage());
return"";
}
}
/**
*比较两个日期相差的天数
*@authordylan_xu
*@dateMar11,2012
*@paramdate1
*@paramdate2
*@return
*/
publicstaticintgetMargin(Stringdate1,Stringdate2){
intmargin;
try{
ParsePositionpos=newParsePosition(0);
ParsePositionpos1=newParsePosition(0);
Datedt1=sdf_date_format.parse(date1,pos);
Datedt2=sdf_date_format.parse(date2,pos1);
longl=dt1.getTime()-dt2.getTime();
margin=(int)(l/(24*60*60*1000));
returnmargin;
}catch(Exceptione){
logger.debug("DateUtil.getMargin():"+e.toString());
return0;
}
}
/**
*比较两个日期相差的天数
*@authordylan_xu
*@dateMar11,2012
*@paramdate1
*@paramdate2
*@return
*/
publicstaticdoublegetDoubleMargin(Stringdate1,Stringdate2){
doublemargin;
try{
ParsePositionpos=newParsePosition(0);
ParsePositionpos1=newParsePosition(0);
Datedt1=sdf_datetime_format.parse(date1,pos);
Datedt2=sdf_datetime_format.parse(date2,pos1);
longl=dt1.getTime()-dt2.getTime();
margin=(l/(24*60*60*1000.00));
returnmargin;
}catch(Exceptione){
logger.debug("DateUtil.getMargin():"+e.toString());
return0;
}
}
/**
*比较两个日期相差的月数
*@authordylan_xu
*@dateMar11,2012
*@paramdate1
*@paramdate2
*@return
*/
publicstaticintgetMonthMargin(Stringdate1,Stringdate2){
intmargin;
try{
margin=(Integer.parseInt(date2.substring(0,4))-Integer.parseInt(date1.substring(0,4)))*12;
margin+=(Integer.parseInt(date2.substring(4,7).replaceAll("-0",
"-"))-Integer.parseInt(date1.substring(4,7).replaceAll("-0","-")));
returnmargin;
}catch(Exceptione){
logger.debug("DateUtil.getMargin():"+e.toString());
return0;
}
}
/**
*返回日期加X天后的日期
*@authordylan_xu
*@dateMar11,2012
*@paramdate
*@parami
*@return
*/
publicstaticStringaddDay(Stringdate,inti){
try{
GregorianCalendargCal=newGregorianCalendar(
Integer.parseInt(date.substring(0,4)),
Integer.parseInt(date.substring(5,7))-1,
Integer.parseInt(date.substring(8,10)));
gCal.add(GregorianCalendar.DATE,i);
returnsdf_date_format.format(gCal.getTime());
}catch(Exceptione){
logger.debug("DateUtil.addDay():"+e.toString());
returngetDate();
}
}
/**
*返回日期加X月后的日期
*@authordylan_xu
*@dateMar11,2012
*@paramdate
*@parami
*@return
*/
publicstaticStringaddMonth(Stringdate,inti){
try{
GregorianCalendargCal=newGregorianCalendar(
Integer.parseInt(date.substring(0,4)),
Integer.parseInt(date.substring(5,7))-1,
Integer.parseInt(date.substring(8,10)));
gCal.add(GregorianCalendar.MONTH,i);
returnsdf_date_format.format(gCal.getTime());
}catch(Exceptione){
logger.debug("DateUtil.addMonth():"+e.toString());
returngetDate();
}
}
/**
*返回日期加X年后的日期
*@authordylan_xu
*@dateMar11,2012
*@paramdate
*@parami
*@return
*/
publicstaticStringaddYear(Stringdate,inti){
try{
GregorianCalendargCal=newGregorianCalendar(
Integer.parseInt(date.substring(0,4)),
Integer.parseInt(date.substring(5,7))-1,
Integer.parseInt(date.substring(8,10)));
gCal.add(GregorianCalendar.YEAR,i);
returnsdf_date_format.format(gCal.getTime());
}catch(Exceptione){
logger.debug("DateUtil.addYear():"+e.toString());
return"";
}
}
/**
*返回某年某月中的最大天
*@authordylan_xu
*@dateMar11,2012
*@paramyear
*@parammonth
*@return
*/
publicstaticintgetMaxDay(intiyear,intimonth){
intday=0;
try{
if(imonth==1||imonth==3||imonth==5||imonth==7
||imonth==8||imonth==10||imonth==12){
day=31;
}elseif(imonth==4||imonth==6||imonth==9||imonth==11){
day=30;
}elseif((0==(iyear%4))&&(0!=(iyear%100))||(0==(iyear%400))){
day=29;
}else{
day=28;
}
returnday;
}catch(Exceptione){
logger.debug("DateUtil.getMonthDay():"+e.toString());
return1;
}
}
/**
*格式化日期
*@authordylan_xu
*@dateMar11,2012
*@paramorgDate
*@paramType
*@paramSpan
*@return
*/
@SuppressWarnings("static-access")
publicStringrollDate(StringorgDate,intType,intSpan){
try{
Stringtemp="";
intiyear,imonth,iday;
intiPos=0;
charseperater='-';
if(orgDate==null||orgDate.length()<6){
return"";
}
iPos=orgDate.indexOf(seperater);
if(iPos>0){
iyear=Integer.parseInt(orgDate.substring(0,iPos));
temp=orgDate.substring(iPos+1);
}else{
iyear=Integer.parseInt(orgDate.substring(0,4));
temp=orgDate.substring(4);
}
iPos=temp.indexOf(seperater);
if(iPos>0){
imonth=Integer.parseInt(temp.substring(0,iPos));
temp=temp.substring(iPos+1);
}else{
imonth=Integer.parseInt(temp.substring(0,2));
temp=temp.substring(2);
}
imonth--;
if(imonth<0||imonth>11){
imonth=0;
}
iday=Integer.parseInt(temp);
if(iday<1||iday>31)
iday=1;
Calendarorgcale=Calendar.getInstance();
orgcale.set(iyear,imonth,iday);
temp=this.rollDate(orgcale,Type,Span);
returntemp;
}catch(Exceptione){
return"";
}
}
publicstaticStringrollDate(Calendarcal,intType,intSpan){
try{
Stringtemp="";
Calendarrolcale;
rolcale=cal;
rolcale.add(Type,Span);
temp=sdf_date_format.format(rolcale.getTime());
returntemp;
}catch(Exceptione){
return"";
}
}
/**
*返回默认的日期格式
*@authordylan_xu
*@dateMar11,2012
*@return
*/
publicstaticsynchronizedStringgetDatePattern(){
defaultDatePattern="yyyy-MM-dd";
returndefaultDatePattern;
}
/**
*将指定日期按默认格式进行格式代化成字符串后输出如：yyyy-MM-dd
*@authordylan_xu
*@dateMar11,2012
*@paramaDate
*@return
*/
publicstaticfinalStringgetDate(DateaDate){
SimpleDateFormatdf=null;
StringreturnValue="";
if(aDate!=null){
df=newSimpleDateFormat(getDatePattern());
returnValue=df.format(aDate);
}
return(returnValue);
}
/**
*取得给定日期的时间字符串，格式为当前默认时间格式
*@authordylan_xu
*@dateMar11,2012
*@paramtheTime
*@return
*/
publicstaticStringgetTimeNow(DatetheTime){
returngetDateTime(timePattern,theTime);
}
/**
*取得当前时间的Calendar日历对象
*@authordylan_xu
*@dateMar11,2012
*@return
*@throwsParseException
*/
publicCalendargetToday()throwsParseException{
Datetoday=newDate();
SimpleDateFormatdf=newSimpleDateFormat(getDatePattern());
StringtodayAsString=df.format(today);
Calendarcal=newGregorianCalendar();
cal.setTime(convertStringToDate(todayAsString));
returncal;
}
/**
*将日期类转换成指定格式的字符串形式
*@authordylan_xu
*@dateMar11,2012
*@paramaMask
*@paramaDate
*@return
*/
publicstaticfinalStringgetDateTime(StringaMask,DateaDate){
SimpleDateFormatdf=null;
StringreturnValue="";
if(aDate==null){
logger.error("aDateisnull!");
}else{
df=newSimpleDateFormat(aMask);
returnValue=df.format(aDate);
}
return(returnValue);
}
/**
*将指定的日期转换成默认格式的字符串形式
*@authordylan_xu
*@dateMar11,2012
*@paramaDate
*@return
*/
publicstaticfinalStringconvertDateToString(DateaDate){
returngetDateTime(getDatePattern(),aDate);
}
/**
*将日期字符串按指定格式转换成日期类型
*@authordylan_xu
*@dateMar11,2012
*@paramaMask指定的日期格式，如:yyyy-MM-dd
*@paramstrDate待转换的日期字符串
*@return
*@throwsParseException
*/
publicstaticfinalDateconvertStringToDate(StringaMask,StringstrDate)
throwsParseException{
SimpleDateFormatdf=null;
Datedate=null;
df=newSimpleDateFormat(aMask);
if(logger.isDebugEnabled()){
logger.debug("converting'"+strDate+"'todatewithmask'"+aMask+"'");
}
try{
date=df.parse(strDate);
}catch(ParseExceptionpe){
logger.error("ParseException:"+pe);
throwpe;
}
return(date);
}
/**
*将日期字符串按默认格式转换成日期类型
*@authordylan_xu
*@dateMar11,2012
*@paramstrDate
*@return
*@throwsParseException
*/
publicstaticDateconvertStringToDate(StringstrDate)
throwsParseException{
DateaDate=null;
try{
if(logger.isDebugEnabled()){
logger.debug("convertingdatewithpattern:"+getDatePattern());
}
aDate=convertStringToDate(getDatePattern(),strDate);
}catch(ParseExceptionpe){
logger.error("Couldnotconvert'"+strDate+"'toadate,throwingexception");
thrownewParseException(pe.getMessage(),pe.getErrorOffset());
}
returnaDate;
}
/**
*返回一个JAVA简单类型的日期字符串
*@authordylan_xu
*@dateMar11,2012
*@return
*/
publicstaticStringgetSimpleDateFormat(){
SimpleDateFormatformatter=newSimpleDateFormat();
StringNDateTime=formatter.format(newDate());
returnNDateTime;
}
/**
*将指定字符串格式的日期与当前时间比较
*@authorDYLAN
*@dateFeb17,2012
*@paramstrDate需要比较时间
*@return
*<p>
*intcode
*<ul>
*<li>-1当前时间<比较时间</li>
*<li>0当前时间=比较时间</li>
*<li>>=1当前时间>比较时间</li>
*</ul>
*</p>
*/
publicstaticintcompareToCurTime(StringstrDate){
if(StringUtils.isBlank(strDate)){
return-1;
}
DatecurTime=cale.getTime();
StringstrCurTime=null;
try{
strCurTime=sdf_datetime_format.format(curTime);
}catch(Exceptione){
if(logger.isDebugEnabled()){
logger.debug("[Couldnotformat'"+strDate+"'toadate,throwingexception:"+e.getLocalizedMessage()+"]");
}
}
if(StringUtils.isNotBlank(strCurTime)){
returnstrCurTime.compareTo(strDate);
}
return-1;
}
/**
*为查询日期添加最小时间
*
*@param目标类型Date
*@param转换参数Date
*@return
*/
@SuppressWarnings("deprecation")
publicstaticDateaddStartTime(Dateparam){
Datedate=param;
try{
date.setHours(0);
date.setMinutes(0);
date.setSeconds(0);
returndate;
}catch(Exceptionex){
returndate;
}
}
/**
*为查询日期添加最大时间
*
*@param目标类型Date
*@param转换参数Date
*@return
*/
@SuppressWarnings("deprecation")
publicstaticDateaddEndTime(Dateparam){
Datedate=param;
try{
date.setHours(23);
date.setMinutes(59);
date.setSeconds(0);
returndate;
}catch(Exceptionex){
returndate;
}
}
/**
*返回系统现在年份中指定月份的天数
*
*@param月份month
*@return指定月的总天数
*/
@SuppressWarnings("deprecation")
publicstaticStringgetMonthLastDay(intmonth){
Datedate=newDate();
int[][]day={{0,30,28,31,30,31,30,31,31,30,31,30,31},
{0,31,29,31,30,31,30,31,31,30,31,30,31}};
intyear=date.getYear()+1900;
if(year%4==0&&year%100!=0||year%400==0){
returnday[1][month]+"";
}else{
returnday[0][month]+"";
}
}
/**
*返回指定年份中指定月份的天数
*
*@param年份year
*@param月份month
*@return指定月的总天数
*/
publicstaticStringgetMonthLastDay(intyear,intmonth){
int[][]day={{0,30,28,31,30,31,30,31,31,30,31,30,31},
{0,31,29,31,30,31,30,31,31,30,31,30,31}};
if(year%4==0&&year%100!=0||year%400==0){
returnday[1][month]+"";
}else{
returnday[0][month]+"";
}
}
/**
*判断是平年还是闰年
*@authordylan_xu
*@dateMar11,2012
*@paramyear
*@return
*/
publicstaticbooleanisLeapyear(intyear){
if((year%4==0&&year%100!=0)||(year%400)==0){
returntrue;
}else{
returnfalse;
}
}
/**
*取得当前时间的日戳
*@authordylan_xu
*@dateMar11,2012
*@return
*/
@SuppressWarnings("deprecation")
publicstaticStringgetTimestamp(){
Datedate=cale.getTime();
Stringtimestamp=""+(date.getYear()+1900)+date.getMonth()
+date.getDate()+date.getMinutes()+date.getSeconds()
+date.getTime();
returntimestamp;
}
/**
*取得指定时间的日戳
*
*@return
*/
@SuppressWarnings("deprecation")
publicstaticStringgetTimestamp(Datedate){
Stringtimestamp=""+(date.getYear()+1900)+date.getMonth()
+date.getDate()+date.getMinutes()+date.getSeconds()
+date.getTime();
returntimestamp;
}
publicstaticvoidmain(String[]args){
System.out.println(getYear()+"|"+getMonth()+"|"+getDate());
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助。