常用 日期 年月周日获取

//获取这一年的日历
    private static Calendar getCalendarFormYear(int year){
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        cal.set(Calendar.YEAR, year);
        return cal;
    }

    //获取某一年的某一周的周日日期
    public static Date getEndDayOfWeekNo(int year, int weekNo) throws ParseException {
        Calendar cal = getCalendarFormYear(year);
        cal.set(Calendar.WEEK_OF_YEAR, weekNo);
        cal.add(Calendar.DAY_OF_WEEK, 6);
        //获得SimpleDateFormat类，我们转换为yyyy-MM-dd的时间格式
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");//注意月份是MM
        String start = cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" +
                cal.get(Calendar.DAY_OF_MONTH);
        Date date= java.sql.Date.valueOf(start);
        return date;
    }

    //获取某一年的某一周的周一日期
    public static Date getStartDayOfWeekNo(int year, int weekNo) throws ParseException {
        Calendar cal = getCalendarFormYear(year);
        cal.set(Calendar.WEEK_OF_YEAR, weekNo);
        //获得SimpleDateFormat类，我们转换为yyyy-MM-dd的时间格式
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");//注意月份是MM
        String start = cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" +
                cal.get(Calendar.DAY_OF_MONTH);
        Date date= java.sql.Date.valueOf(start);
        return date;
    }

    /**
     * 获取指定年月的第一天
     * @param year
     * @param month
     * @return
     */
    public static Date getFirstDayOfMonth1(int year, int month) {
        Calendar cal = Calendar.getInstance();
        //设置年份
        cal.set(Calendar.YEAR, year);
        //设置月份
        cal.set(Calendar.MONTH, month-1);
        //获取某月最小天数
        int firstDay = cal.getMinimum(Calendar.DATE);
        //设置日历中月份的最小天数
        cal.set(Calendar.DAY_OF_MONTH,firstDay);
        //格式化日期
//        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String start = cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" +
                cal.get(Calendar.DAY_OF_MONTH);
        Date date= java.sql.Date.valueOf(start);
        return date;
    }

    /**
     * 获取指定年月的最后一天
     * @param year
     * @param month
     * @return
     */
    public static Date getLastDayOfMonth1(int year, int month) {
        Calendar cal = Calendar.getInstance();
        //设置年份
        cal.set(Calendar.YEAR, year);
        //设置月份
        cal.set(Calendar.MONTH, month-1);
        //获取某月最大天数
        int lastDay = cal.getActualMaximum(Calendar.DATE);
        //设置日历中月份的最大天数
        cal.set(Calendar.DAY_OF_MONTH, lastDay);
        //格式化日期
//        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String start = cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" +
                cal.get(Calendar.DAY_OF_MONTH);
        Date date= java.sql.Date.valueOf(start);
        return date;
    }
    /**
     * 获取指定年月的第一天
     * @param year
     * @param
     * @return
     */
    public static Date getFirstDay(int year) {
        Calendar cal = Calendar.getInstance();
        //设置年份
        cal.set(Calendar.YEAR, year);
        //设置月份
        cal.set(Calendar.MONTH, 0);
        cal.set(Calendar.DAY_OF_MONTH,1);
        String start = cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" +
                cal.get(Calendar.DAY_OF_MONTH);
        Date date= java.sql.Date.valueOf(start);
        return date;
    }
    /**
     * 获取指定年月的最后一天
     * @param year
     * @param
     * @return
     */
    public static Date getLastDay(int year) {
        Calendar cal = Calendar.getInstance();
        //设置年份
        cal.set(Calendar.YEAR, year);
        //设置月份
        cal.set(Calendar.MONTH,11);
        cal.set(Calendar.DAY_OF_MONTH,31);
        String start = cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" +
                cal.get(Calendar.DAY_OF_MONTH);
        Date date= java.sql.Date.valueOf(start);
        return date;
    }
    /**
     * 拆分时间年
     * @param dtae
     * @param
     * @return
     */
    public static int getYearDay(Date dtae) {
        SimpleDateFormat sdf0 = new SimpleDateFormat("yyyy");
        String str1 = sdf0.format(dtae);
        int year = 0;
        try {
            year = Integer.parseInt(str1);
        } catch (NumberFormatException e) {
            e.printStackTrace();
        }
        return year;
    }
    /**
     * 拆分时间月
     * @param dtae
     * @param
     * @return
     */
    public static int getMonthDay(Date dtae) {
        SimpleDateFormat sdf1 = new SimpleDateFormat("MM");
        String str1 = sdf1.format(dtae);
        int month = 0;
        try {
            month = Integer.parseInt(str1);
        } catch (NumberFormatException e) {
            e.printStackTrace();
        }
        return month;
    }

    /**
     * 根据年 月 获取对应的月份 天数
     */
    public static String[] getDaysByYearMonth(int year, int month) {

        Calendar a = Calendar.getInstance();
        a.set(Calendar.YEAR, year);
        a.set(Calendar.MONTH, month - 1);
        a.set(Calendar.DATE, 1);
        a.roll(Calendar.DATE, -1);
        int maxDate = a.get(Calendar.DATE);
        if(maxDate == 31){
            String[] xDate = {"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31"};
            return xDate;
        }else if(maxDate == 30){
            String[] xDate = {"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30"};
            return xDate;
        }else if(maxDate == 28){
            String[] xDate =  {"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28"};
            return xDate;
        }else {
            String[] xDate =  {"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28"};
            return xDate;
        }
    }

    /**
     * 获取当年每个月数组
     * @return
     */
    public static String[] getByYearMonthL() {
        String[] last12Months = new String[12];
        Calendar cal = Calendar.getInstance();
        //如果当前日期大于二月份的天数28天或者29天会导致计算月份错误，会多出一个三月份，故设置一个靠前日期解决此问题
        for (int i = 0; i < 12; i++) {
            last12Months[0 + i] = cal.get(Calendar.YEAR) + "-" + (i + 1)+"-01";
            cal.set(Calendar.MONTH, i + 1); //逐次往前推1个月
        }
//        for (int i = 0; i < last12Months.length; i++) {
//            System.out.println(last12Months[i]);
//        }
        return last12Months;
    }

    /**
     * 获取当天所有小时数组
     * @return
     */
    public static String[] getByDayHourL() {
        String[] last24Hour = new String[24];
        Calendar cal = Calendar.getInstance();
        for (int i = 0; i < 24; i++) {
            last24Hour[0 + i] = cal.get(Calendar.YEAR) + "-" +(cal.get(Calendar.MONTH)+1)+"-"+cal.get(Calendar.DATE)+" "+(i)+":"+cal.get(Calendar.MINUTE);
            cal.set(Calendar.HOUR_OF_DAY, i + 1);
        }
//        for (int i = 0; i < last12Months.length; i++) {
//            System.out.println(last12Months[i]);
//        }
        return last24Hour;
    }
    public static String[] getByDayHourLTe() {
        String[] last24Hour = new String[24];
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH");//时间格式化
        Calendar calendar=Calendar.getInstance();
        Date date=new Date();
        calendar.setTime(date);

        for(int i=24;i>0;i--){//当前时间循环24小时减下去

            calendar.set(Calendar.HOUR_OF_DAY,calendar.get(Calendar.HOUR_OF_DAY) - 1);
            String time = sdf.format(calendar.getTime());
            last24Hour[i-1]=time;
        }
        return last24Hour;
    }
    /**
     * 時間戳格式化
     * @param date
     * @param
     * @return
     */
    public static String getStringDate(Date date) {
        SimpleDateFormat sdfDate = new SimpleDateFormat("yyyy-MM-dd");
        String str1 = sdfDate.format(date);
        return str1;
    }