java 8 LocalDate 一些常用日期的方法封装

项目中做报表的时候会经常的使用日期作为开始和结束的条件进行查询，往往只是知道有这么回事，但是写就吃力了。今天抽时间写一个工具类，算是为后面再写的时候拿来主义吧，废话不多说，show me the code.

/**
 * 描述：LocalDate 获取周，月开始时间
 *
 * @author hd
 * @date 2019-11-21 11:53
 **/
public class LocalDateUtil {
    private final static DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd");
    private final static DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    /**
     * 将字符串按照格式转为日期
     * @param date
     * @param formatter
     * @return
     */
    public static LocalDate parseStrDate(String date,String formatter){
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern(formatter);
        return LocalDate.parse(date,dtf);
    }

    /**
     * 将日期格化式
     * @param localDate
     * @param formatter
     * @return
     */
    public static String formatLocalDate(LocalDate localDate,String formatter){
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern(formatter);
        return localDate.format(dtf);
    }

    /**
     * 获取 00:00:00
     * @return
     */
    public static String dayStartTime(String date){
        LocalDateTime localDateTime = LocalDateTime.of(LocalDate.parse(date,dtf), LocalTime.MIN);
        return localDateTime.format(df);
    }

    /**
     * 获取 23：59：59
     * @return
     */
    public static String dayEndTime(String date){
        LocalDateTime localDateTime = LocalDateTime.of(LocalDate.parse(date,dtf), LocalTime.MAX);
        return localDateTime.format(df);
    }

    /**
     * 获取 12:00:00
     * @return
     */
    public static String dayMiddleTime(String date){
        LocalDateTime localDateTime = LocalDateTime.of(LocalDate.parse(date,dtf), LocalTime.NOON);
        return localDateTime.format(df);
    }

    /**
     * 获取周开始日期
     * @param date
     * @return
     */
    public static String firstDayOfWeek(String date){
        TemporalAdjuster FIRST_OF_WEEK =
                TemporalAdjusters.ofDateAdjuster(localDate -> localDate.minusDays(localDate.getDayOfWeek().getValue()- DayOfWeek.MONDAY.getValue()));
        return dtf.format(LocalDate.parse(date,dtf).with(FIRST_OF_WEEK));
    }

    /**
     * 获取周结束日期
     * @param date
     * @return
     */
    public static String endDayOfWeek(String date){
        TemporalAdjuster LAST_OF_WEEK =
                TemporalAdjusters.ofDateAdjuster(localDate -> localDate.plusDays(DayOfWeek.SUNDAY.getValue() - localDate.getDayOfWeek().getValue()));
        return dtf.format(LocalDate.parse(date,dtf).with(LAST_OF_WEEK));
    }

    /**
     * 获取月开始日期
     * @param date
     * @return
     */
    public static String firstDayOfMonth(String date){
        LocalDate inputDate = LocalDate.parse(date,dtf);
        return dtf.format(inputDate.with(TemporalAdjusters.firstDayOfMonth()));
    }

    /**
     * 获取月结束日期
     * @param date
     * @return
     */
    public static String endDayOfMonth(String date){
        LocalDate inputDate = LocalDate.parse(date,dtf);
        return dtf.format(inputDate.with(TemporalAdjusters.lastDayOfMonth()));
    }

    /**
     * 获取下个月开始日期
     * @param date
     * @return
     */
    public static String firstDayOfNextMonth(String date){
        LocalDate inputDate = LocalDate.parse(date,dtf);
        return  dtf.format(inputDate.with(TemporalAdjusters.firstDayOfNextMonth()));
    }

    /**
     * 获取下个年开始日期
     * @param date
     * @return
     */
    public static String firstDayOfNextYear(String date){
        LocalDate inputDate = LocalDate.parse(date,dtf);
        return  dtf.format(inputDate.with(TemporalAdjusters.firstDayOfNextYear()));
    }

    public static void main(String[] args) {
        System.out.println(firstDayOfNextMonth("2019-11-19"));
    }
}

暂时写到这里，后续遇到不满足的时候再补充：
git地址：

https://github.com/sunny-aria/java-study/blob/88ef905b94235a86b186ca1f5904255e76d4b16f/src/main/java/study/daily/localDate/LocalDateUtil.java

都是一些日常总结，

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