java中对date的一些处理以及获取date

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在写项目的过程中，经常会遇到对日期的一些处理，或者对日期的获取

之前写的时候都是需要哪个百度查找，写上就没有下文了，这次我把自己遇到过得，写过的总结一下，相当于是一个记录

?private final static String YEAR_MONTH_DAY_HOURS_MINUTE_SECOND = "yyyy-MM-dd hh:mm:ss";

public static void main(String[] args) {
		try {
			getNowDate();
			String date2 = "2020-12-31 02:21:31";
			stringToDate(date2,YEAR_MONTH_DAY_HOURS_MINUTE_SECOND);
			dateToString(new Date(),YEAR_MONTH_DAY_HOURS_MINUTE_SECOND);
			currentWeekFirstDay();
			currentWeekLastDay();
			yesterDay(YEAR_MONTH_DAY_HOURS_MINUTE_SECOND);
			lastDay(YEAR_MONTH_DAY_HOURS_MINUTE_SECOND);
			currentMonthFirstDay();
			currentMonthLastDay();
			datetoWeek(new Date());
			dateofTheWeekToMap(new Date());
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}

  //获取当前时间

?public static Date getNowDate() throws Exception{
?? ??? ?Date date = new Date();
?? ??? ?return date;
?? ?}

 //获取到昨天

public static String yesterDay(String dateType) throws Exception{
?? ??? ?Calendar calendar = new GregorianCalendar();
?? ??? ?calendar.setTime(new Date());
?? ??? ?calendar.add(Calendar.DATE,-1);
?? ??? ?SimpleDateFormat sdf = new SimpleDateFormat(dateType);
?? ??? ?String dateString = sdf.format(calendar.getTime());
?? ??? ?return dateString;
?? ?}

  //获取到明天

public static String lastDay(String dateType) throws Exception{
?? ??? ?Calendar calendar = new GregorianCalendar();
?? ??? ?calendar.setTime(new Date());
?? ??? ?calendar.add(Calendar.DATE,1);
?? ??? ?SimpleDateFormat sdf = new SimpleDateFormat(dateType);
?? ??? ?String dateString = sdf.format(calendar.getTime());
?? ??? ?return dateString;
?? ?}

 //String 转 date

?public static Date stringToDate(String dateString,String dateType) throws Exception{
?? ??? ?SimpleDateFormat sdf = new SimpleDateFormat(dateType);
?? ??? ?Date date = sdf.parse(dateString);
?? ??? ?return date;
?? ?}

//date 转 String

public static String dateToString(Date date,String dateType) throws Exception{
?? ??? ?SimpleDateFormat sdf = new SimpleDateFormat(dateType);
?? ??? ?String dateString = sdf.format(date);
?? ??? ?return dateString;
?? ?}

 //获取本周第一天

public static Date currentWeekFirstDay() throws Exception{
?? ??? ?Calendar cal=Calendar.getInstance();
? ? ? ? cal.add(Calendar.WEEK_OF_MONTH, 0);
? ? ? ? cal.set(Calendar.DAY_OF_WEEK, 2);
? ? ? ? Date date=cal.getTime();
? ? ? ? return date;
?? ?}

  //获取本周最后一天

?public static Date currentWeekLastDay() throws Exception{
?? ??? ?Calendar cal=Calendar.getInstance();
? ? ? ? cal.set(Calendar.DAY_OF_WEEK, cal.getActualMaximum(Calendar.DAY_OF_WEEK));
? ? ? ? cal.add(Calendar.DAY_OF_WEEK, 1);
? ? ? ? Date date=cal.getTime();
? ? ? ? return date;
?? ?}

 //据一个日期推算当周的每一天日期

?public static Map<String, Date> dateofTheWeekToMap(Date date) throws Exception{
?? ??? ?SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String[] weekDays = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
        if (w < 0) {
            w = 0;
        }
        String str =  weekDays[w];
        List<Date> days = dateofWeekToList(date);
        Map<String,Date> dayWeekMap = new HashMap<>();
        for (Date d : days) {
            Calendar c = Calendar.getInstance();
            c.setTime(d);
            dayWeekMap.put(weekDays[c.get(Calendar.DAY_OF_WEEK)-1],d);
        }
        return dayWeekMap;
?? ?}

?public static List<Date> dateofWeekToList(Date date) throws Exception{
        int b = date.getDay();
        Date oneDate;
        List<Date> list = new ArrayList<Date>();
        Long fTime = date.getTime() - b * 24 * 3600000;
        for (int a = 1; a <= 7; a++) {
            oneDate= new Date();
            oneDate.setTime(fTime + (a * 24 * 3600000));
            list.add(a-1, oneDate);
        }
        return list;
?? ?}

   //获取本月第一天

public static Date currentMonthFirstDay() throws Exception{
?? ??? ?Calendar calendar = Calendar.getInstance();
?? ??? ?calendar.add(Calendar.MONTH, 0);
?? ??? ?calendar.set(Calendar.DAY_OF_MONTH,1);//1:本月第一天
?? ??? ?Date date = calendar.getTime();
?? ??? ?return date;
?? ?}

  //获取本月最后一天

public static Date currentMonthLastDay() throws Exception{
?? ??? ?Calendar calendar = Calendar.getInstance();
?? ??? ?calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
?? ??? ?Date date = calendar.getTime();
?? ??? ?return date;
?? ?}

  //根据时间得到该时间是周几

public static String datetoWeek(Date date) throws Exception{
?? ??? ?String week = "";
?? ??? ?Calendar c = Calendar.getInstance();
?? ??? ?c.setTime(date);
?? ??? ?int weekday = c.get(Calendar.DAY_OF_WEEK);
?? ??? ?if (weekday == 1) {
?? ??? ??? ?week = "星期日";
?? ??? ?} else if (weekday == 2) {
?? ??? ??? ?week = "星期一";
?? ??? ?} else if (weekday == 3) {
?? ??? ??? ?week = "星期二";
?? ??? ?} else if (weekday == 4) {
?? ??? ??? ?week = "星期三";
?? ??? ?} else if (weekday == 5) {
?? ??? ??? ?week = "星期四";
?? ??? ?} else if (weekday == 6) {
?? ??? ??? ?week = "星期五";
?? ??? ?} else if (weekday == 7) {
?? ??? ??? ?week = "星期六";
?? ??? ?}
?? ??? ?return week;
?? ?}

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