Java日期操作--工具类

客官°小女子只卖身不卖艺 2023-06-30 02:36 20阅读 0赞

import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    import java.util.Locale;
    
    /**
     * 日期操作工具类
     * @author chen
     */
    public class DatetimeUtil {
    
        /**
         * 日期格式化
         * @param strVal
         * @param format
         * @return
         */
        public static Date getDateTime(String strVal, String format) {
            try {
                SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
                Date date = simpleDateFormat.parse(strVal);
                return date;
            } catch (ParseException e) {
                return null;
            }
        }
    
        /**
         * 将字符串转化为日期类型 yyyy-MM-dd
         * @param strVal
         * @return
         */
        public static Date getDate(String strVal) {
            return getDateTime(strVal, "yyyy-MM-dd");
        }
    
        /**
         * 将字符串转化为日期类型 yyyy-MM-dd HH:mm:ss
         * @param strVal
         * @return
         */
        public static Date getDateTime(String strVal) {
            return getDateTime(strVal, "yyyy-MM-dd HH:mm:ss");
        }
    
        /**
         * 将字符串按指定类型进行转换
         * @param date
         * @param format
         * @return
         */
        public static String getDateTimeString(Date date, String format) {
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
            String str = simpleDateFormat.format(date);
            return str;
        }
    
        /**
         * 将日期转换成年份
         * @param date
         * @return
         */
        public static String getYearString(Date date) {
            return getDateTimeString(date, "yyyy");
        }
    
        /**
         * 将日期转换成yyyy-MM-dd形式的字符串
         * @param date
         * @return
         */
        public static String getDateString(Date date) {
            return getDateTimeString(date, "yyyy-MM-dd");
        }
    
        /**
         * 将日期转换成yyyy-MM-dd HH:mm:ss形式的字符串
         * @param date
         * @return
         */
        public static String getDateTimeString(Date date) {
            return getDateTimeString(date, "yyyy-MM-dd HH:mm:ss");
        }
    
        /**
         * 给日期添加开始时间
         * @param date
         * @return
         */
        public static Date getDateBegin(Date date) {
            String strVal = getDateString(date) + " 00:00:00";
            return getDateTime(strVal);
        }
    
        /**
         * 给日期添加结束时间
         * @param date
         * @return
         */
        public static Date getDateEnd(Date date) {
            String strVal = getDateString(date) + " 23:59:59";
            return getDateTime(strVal);
        }
    
        /**
         * 获取某年开始时刻
         * @param year
         * @return Date
         */
        public static Date getYearBegin(int year) {
            String strVal = year + "-01-01 00:00:00";
            return getDateTime(strVal);
        }
    
        /**
         * 获取某年结束时刻
         * @param year
         * @return Date
         */
        public static Date getYearEnd(int year) {
            String strVal = year + "-12-31 23:59:59";
            return getDateTime(strVal);
        }
    
        /**
         * 获取今年开始时刻
         * @return Date
         */
        public static Date getYearBegin() {
            Integer year = Calendar.getInstance().get(Calendar.YEAR);
            String strVal = year + "-01-01 00:00:00";
            return getDateTime(strVal);
        }
    
        /**
         * 获取今年结束时刻
         * @return Date
         */
        public static Date getYearEnd() {
            Integer year = Calendar.getInstance().get(Calendar.YEAR);
            String strVal = year + "-12-31 23:59:59";
            return getDateTime(strVal);
        }
    
        /**
         * 将日期重新格式化
         * @param strVal
         * @param fromFormat
         * @param toFormat
         * @return
         */
        public static String convertDateTimeString(String strVal, String fromFormat, String toFormat) {
            Date date = DatetimeUtil.getDateTime(strVal, fromFormat);
            return DatetimeUtil.getDateTimeString(date, toFormat);
        }
    
        /**
         * 当前时间加n年
         * @param n
         * @return
         */
        public static Date addYearFromNow(Integer n) {
            Calendar calendar=Calendar.getInstance(Locale.CHINA);
            calendar.setTime(new Date());
            calendar.add(Calendar.YEAR, n);
            Date date = calendar.getTime();
            return date;
        }
    
        /**
         * 传入Calendar获得日期
         * @param calendar
         * @return
         */
        public static String getYearMonthDay(Calendar calendar) {
            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH) + 1;
            int day = calendar.get(Calendar.DAY_OF_MONTH);
            return year + "-" + month + "-" + day;
        }
    
        /**
         * 获取这周的某天
         * @param calendar
         * @param day_of_week
         * @return
         */
        public static String getWeekDate(Calendar calendar, int day_of_week) {
            //最小星期一
            while(calendar.get(Calendar.DAY_OF_WEEK) != 2 && calendar.get(Calendar.DAY_OF_WEEK) != day_of_week) {
                calendar.add(Calendar.DAY_OF_MONTH, -1);
            }
            if(calendar.get(Calendar.DAY_OF_WEEK) == day_of_week)
                return DatetimeUtil.getDateString(calendar.getTime());
            //最大星期日
            while(calendar.get(Calendar.DAY_OF_WEEK) != 1 && calendar.get(Calendar.DAY_OF_WEEK) != day_of_week) {
                calendar.add(Calendar.DAY_OF_MONTH, 1);
            }
            return DatetimeUtil.getDateString(calendar.getTime());
        }
    
    }