一个处理Date与String的工具类
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public class DateUtil {
private DateUtil(){
}
public static final String hhmmFormat="HH:mm";
public static final String MMddFormat="MM-dd";
public static final String yyyyFormat="yyyy";
public static final String yyyyChineseFormat="yyyy年";
public static final String yyyyMMddFormat="yyyy-MM-dd";
public static final String fullFormat="yyyy-MM-dd HH:mm:ss";
public static final String MMddChineseFormat="MM月dd日";
public static final String yyyyMMddChineseFormat="yyyy年MM月dd日";
public static final String fullChineseFormat="yyyy年MM月dd日 HH时mm分ss秒";
public static final String [] WEEKS={"星期日","星期一","星期二","星期三","星期四","星期五","星期六"};
public static final String [] WEEKS_EN={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
public static final String YMD_FORMAT = "yyyyMMdd";
/**
* 得到指定时间的时间日期格式
* @param date 指定的时间
* @param format 时间日期格式
* @return
*/
public static String getFormatDateTime(Date date,String format){
DateFormat df=new SimpleDateFormat(format);
return df.format(date);
}
/**
* 得到指定时间的时间日期格式
* @param date 指定的时间
* @param format 时间日期格式
* @param land 语言类型 en=英文，zh_CN=中文
* @return
*/
public static String getFormatDateTime(Date date,String format,String land){
String time;
String week;
DateFormat df=new SimpleDateFormat(format);
time = df.format(date);
week = land.equals("zh_CN") ? WEEKS[getWeek(date)-1] : WEEKS_EN[getWeek(date)-1];
time = time +" "+week;
return time;
}
public static String formatDate(Date date, String format){
DateFormat df=new SimpleDateFormat(format);
return df.format(date);
}
public static String formatDateYmd(Date date){
DateFormat df=new SimpleDateFormat("yyyyMMdd");
return df.format(date);
}
public static String formatDateYmdHms(Date date){
DateFormat df=new SimpleDateFormat("yyyyMMdd HH:mm:ss");
return df.format(date);
}
public static Date stringToDateYmd(String dateString) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
Date date = null;
try {
date = simpleDateFormat.parse(dateString);
} catch (ParseException e) {
e.printStackTrace();
}
simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
String formattedTime = simpleDateFormat.format(date);
date = java.sql.Date.valueOf(formattedTime);
return date;
}
public static Date stringToDateYmdHms(String dateString) {
Date date = null;
try
{
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
date = sdf.parse(dateString);
}
catch (ParseException e)
{
System.out.println(e.getMessage());
}
return date;
}
public static Date parseDateYmdHms(String dateString) {
Date date = null;
try
{
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm:ss");
date = sdf.parse(dateString);
}
catch (ParseException e)
{
throw new RuntimeException(e);
}
return date;
}
/**
* 判断是否是润年
* @param date 指定的时间
* @return true:是润年,false:不是润年
*/
public static boolean isLeapYear(Date date) {
Calendar cal=Calendar.getInstance();
cal.setTime(date);
return isLeapYear(cal.get(Calendar.YEAR));
}
/**
* 判断是否是润年
* @param year 指定的年
* @return true:是润年,false:不是润年
*/
public static boolean isLeapYear(int year) {
GregorianCalendar calendar = new GregorianCalendar();
return calendar.isLeapYear(year);
}
/**
* 判断指定的时间是否是今天
* @param date 指定的时间
* @return true:是今天,false:非今天
*/
public static boolean isInToday(Date date){
boolean flag=false;
Date now=new Date();
String fullFormat=getFormatDateTime(now, DateUtil.yyyyMMddFormat);
String beginString=fullFormat+" 00:00:00";
String endString=fullFormat+" 23:59:59";
DateFormat df=new SimpleDateFormat(DateUtil.fullFormat);
try {
Date beginTime=df.parse(beginString);
Date endTime=df.parse(endString);
flag=date.before(endTime)&&date.after(beginTime);
} catch (ParseException e) {
e.printStackTrace();
}
return flag;
}
/**
* 判断两时间是否是同一天
* @param from 第一个时间点
* @param to 第二个时间点
* @return true:是同一天,false:非同一天
*/
public static boolean isSameDay(Date from,Date to){
boolean isSameDay=false;
DateFormat df=new SimpleDateFormat(DateUtil.yyyyMMddFormat);
String firstDate=df.format(from);
String secondDate=df.format(to);
isSameDay=firstDate.equals(secondDate);
return isSameDay;
}
/**
* 求出指定的时间那天是星期几
* @param date 指定的时间
* @return 星期X
*/
public static String getWeekString(Date date){
return DateUtil.WEEKS[getWeek(date)-1];
}
/**
* 求出指定时间那天是星期几
* @param date 指定的时间
* @return 1-7
*/
public static int getWeek(Date date){
int week=0;
Calendar cal=Calendar.getInstance();
cal.setTime(date);
week=cal.get(Calendar.DAY_OF_WEEK);
return week;
}
/**
* 取得指定时间离现在是多少时间以前，如：3秒前,2小时前等
* 注意：此计算方法不是精确的
* @param date 已有的指定时间
* @return 时间段描述
*/
public static String getAgoTimeString(Date date){
Date now=new Date();
Calendar cal=Calendar.getInstance();
cal.setTime(date);
Date agoTime=cal.getTime();
long mtime=now.getTime()-agoTime.getTime();
String str="";
long stime=mtime/1000;
long minute=60;
long hour=60*60;
long day=24*60*60;
long weeks=7*24*60*60;
long months=100*24*60*60;
if(stime<minute){
long time_value=stime;
if(time_value<=0){
time_value=1;
}
str=time_value+"秒前";
}else if(stime>=minute && stime<hour){
long time_value=stime/minute;
if(time_value<=0){
time_value=1;
}
str=time_value+"分前";
}else if(stime>=hour && stime<day){
long time_value=stime/hour;
if(time_value<=0){
time_value=1;
}
str=time_value+"小时前";
}else if(stime>=day&&stime<weeks){
long time_value=stime/day;
if(time_value<=0){
time_value=1;
}
str=time_value+"天前";
}else if(stime>=weeks&&stime<months){
DateFormat df=new SimpleDateFormat(DateUtil.MMddFormat);
str=df.format(date);
}else{
DateFormat df=new SimpleDateFormat(DateUtil.yyyyMMddFormat);
str=df.format(date);
}
return str;
}
/**
* 判断指定时间是否是周末
* @param date 指定的时间
* @return true:是周末,false:非周末
*/
public static boolean isWeeks(Date date){
boolean isWeek=false;
isWeek=(getWeek(date)-1==0||getWeek(date)-1==6);
return isWeek;
}
/**
* 获取当前日期
* @return Date
* */
public static Date getToday(){
String date = DateUtil.formatDate(new Date(), YMD_FORMAT);
return DateUtil.stringToDateYmd(date);
}
/**
* 获取当前日期
* @return Date
* */
public static String getTodayStrYmd(){
String date = DateUtil.formatDate(new Date(), YMD_FORMAT);
return date;
}
/**
* 得到今天的最开始时间
* @return 今天的最开始时间
*/
public static Date getTodayBeginTime(){
String beginString= DateUtil.yyyyMMddFormat+" 00:00:00";
DateFormat df=new SimpleDateFormat(DateUtil.fullFormat);
Date beginTime=new Date();
try {
beginTime=df.parse(beginString);
} catch (ParseException e) {
e.printStackTrace();
}
return beginTime;
}
/**
* 得到今天的最后结束时间
* @return 今天的最后时间
*/
public static Date getTodayEndTime(){
String endString= DateUtil.yyyyMMddFormat+" 23:59:59";
DateFormat df=new SimpleDateFormat(DateUtil.fullFormat);
Date endTime=new Date();
try {
endTime=df.parse(endString);
} catch (ParseException e) {
e.printStackTrace();
}
return endTime;
}
/**
* 取得本周的开始时间
* @return 本周的开始时间
*/
public static Date getThisWeekBeginTime(){
Date beginTime=null;
Calendar cal=Calendar.getInstance();
int week=getWeek(cal.getTime());
week=week-1;
int days=0;
if(week==0){
days=6;
}else{
days=week-1;
}
cal.add(Calendar.DAY_OF_MONTH, -days);
beginTime=cal.getTime();
return beginTime;
}
/**
* 取得本周的开始日期
* @param format 时间的格式
* @return 指定格式的本周最开始时间
*/
public static String getThisWeekBeginTimeString(String format){
DateFormat df=new SimpleDateFormat(format);
return df.format(getThisWeekBeginTime());
}
/**
* 取得本周的结束时间
* @return 本周的结束时间
*/
public static Date getThisWeekEndTime(){
Date endTime=null;
Calendar cal=Calendar.getInstance();
int week=getWeek(cal.getTime());
week=week-1;
int days=0;
if(week!=0){
days=7-week;
}
cal.add(Calendar.DAY_OF_MONTH, days);
endTime=cal.getTime();
return endTime;
}
/**
* 取得本周的结束日期
* @param format 时间的格式
* @return 指定格式的本周结束时间
*/
public static String getThisWeekEndTimeString(String format){
DateFormat df=new SimpleDateFormat(format);
return df.format(getThisWeekEndTime());
}
/**
* 取得两时间相差的天数
* @param from 第一个时间
* @param to 第二个时间
* @return 相差的天数
*/
public static long getBetweenDays(Date from, Date to){
long days=0;
long dayTime=24*60*60*1000;
long fromTime=from.getTime();
long toTime=to.getTime();
long times=Math.abs(fromTime-toTime);
days=times/dayTime;
return days;
}
/**
* 取得两时间相差的小时数
* @param from 第一个时间
* @param to 第二个时间
* @return 相差的小时数
*/
public static long getBetweenHours(Date from,Date to){
long hours=0;
long hourTime=60*60*1000;
long fromTime=from.getTime();
long toTime=to.getTime();
long times=Math.abs(fromTime-toTime);
hours=times/hourTime;
return hours;
}
/**
* 取得在指定时间上加减days天后的时间
* @param date 指定的时间
* @param days 天数,正为加，负为减
* @return 在指定时间上加减days天后的时间
*/
public static Date addDays(Date date,int days){
Date time=null;
Calendar cal=Calendar.getInstance();
cal.add(Calendar.DAY_OF_MONTH, days);
time=cal.getTime();
return time;
}
/**
* 取得在指定时间上加减months月后的时间
* @param date 指定时间
* @param months 月数，正为加，负为减
* @return 在指定时间上加减months月后的时间
*/
public static Date addMonths(Date date,int months){
Date time=null;
Calendar cal=Calendar.getInstance();
cal.add(Calendar.MONTH, months);
time=cal.getTime();
return time;
}
/**
* 取得在指定时间上加减years年后的时间
* @param date 指定时间
* @param years 年数，正为加，负为减
* @return 在指定时间上加减years年后的时间
*/
public static Date addYears(Date date,int years){
Date time=null;
Calendar cal=Calendar.getInstance();
cal.add(Calendar.YEAR, years);
time=cal.getTime();
return time;
}
/**
* @param args
*/
public static void main(String[] args) {
System.out.println(getFormatDateTime(new Date(), DateUtil.yyyyMMddFormat,"en"));
/* System.out.println(getFormatDateTime(new Date(),DateUtil.fullChineseFormat));
System.out.println(isLeapYear(new Date()));
Calendar cal=Calendar.getInstance();
System.out.println(isInToday(cal.getTime()));
Calendar cal2=Calendar.getInstance();
cal2.set(2011, 06, 05);
System.out.println(isSameDay(cal.getTime(),cal2.getTime()));
System.out.println(WEEKS[getWeek(new Date())]); //星期几
DateFormat df=new SimpleDateFormat(DateUtil.fullFormat);
String fullString="2011-06-03 22:37:20";
try {
Date fulldate=df.parse(fullString);
System.out.println(getBetweenDays(fulldate,cal.getTime()));
System.out.println("ago:"+getAgoTimeString(fulldate));
System.out.println(isWeeks(fulldate));
} catch (ParseException e) {
e.printStackTrace();
}
System.out.println(getThisWeekBeginTimeString(DateUtil.yyyyMMddChineseFormat));
System.out.println(getThisWeekEndTimeString(DateUtil.yyyyMMddChineseFormat));
System.out.println(addDays(new Date(),3));
System.out.println(addDays(new Date(),-3));
System.out.println(addMonths(new Date(),2));
System.out.println(addMonths(new Date(),-2));
System.out.println(addYears(new Date(),1));
System.out.println(addYears(new Date(),-1));
*/
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