java8新特性之 LocalDateTime工具最全解析
LocalDateTime工具类
package com.ruoyi.common.utils;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAdjusters;
import java.util.Date;
import static java.time.temporal.ChronoField.*;
import static java.time.temporal.ChronoUnit.*;
/**
* LocalDateTime工具
* @date 2022-8-19
* @author: 强子
*/
public class LocalDateTimeUtils {
private static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
private static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");
/**
* 获取当前日期字符串 yyyy-MM-dd
*/
public static String getCurrentDateStr() {
return LocalDate.now().format(DATE_FORMATTER);
}
/**
* 获取当前日期时间字符串 yyyy-MM-dd HH:mm:ss
*/
public static String getCurrentDateTimeStr() {
return LocalDateTime.now().format(DATE_TIME_FORMATTER);
}
/**
* Date 转 LocalDate yyyy-MM-dd
* @return
*/
public static LocalDate dateToLocalDate(Date date) {
return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
}
/**
* Date 转 LocalDateTime yyyy-MM-dd HH:mm:ss
* @param date
* @return
*/
public static LocalDateTime dateToLocalDateTime(Date date) {
return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime();
}
/**
* Date 转 日期字符串
* @param date yyyy-MM-dd
*/
public static String dateToDateStr(Date date) {
return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate().format(DATE_FORMATTER);
}
/**
* Date 转日期时间字符串
* @param date yyyy-MM-dd HH:mm:ss
*/
public static String dateToDateTimeStr(Date date) {
return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime().format(DATE_TIME_FORMATTER);
}
/**
* LocalDate 转 Date
* @param localDate yyyy-MM-dd
* @return 返回Date日期
*/
public static Date toDate(LocalDate localDate) {
return Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
}
/**
* LocalDateTime 转 Date
* @param localDateTime yyyy-MM-dd HH:mm:ss
*/
public static Date toDateTime(LocalDateTime localDateTime) {
return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
}
/**
* LocalDate 转 日期字符串
* @param localDate yyyy-MM-dd
*/
public static String localDateToDateStr(LocalDate localDate) {
return localDate.format(DATE_FORMATTER);
}
/**
* LocalDateTime 转 日期时间字符串
* @param localDateTime yyyy-MM-dd HH:mm:ss
*/
public static String localDateTimeToDateTimeStr(LocalDateTime localDateTime) {
return localDateTime.format(DATE_TIME_FORMATTER);
}
/**
* 日期时间字符串 转 LocalDateTime
* @param dateTimeStr yyyy-MM-dd HH:mm:ss
* @return
*/
public static LocalDateTime dateTimeStrToLocalDateTime(String dateTimeStr) {
return LocalDateTime.parse(dateTimeStr, DATE_TIME_FORMATTER);
}
/**
* 日期字符串 转 LocalDate
* @param dateStr yyyy-MM-dd
* @return
*/
public static LocalDate dateStrToLocalDate(String dateStr) {
return LocalDate.parse(dateStr, DATE_FORMATTER);
}
/**
* 日期字符串 转 Date
* @param dateStr yyyy-MM-dd
* @return
*/
public static Date dateStrToDate(String dateStr) {
return Date.from(LocalDate.parse(dateStr, DATE_FORMATTER).atStartOfDay(ZoneId.systemDefault()).toInstant());
}
/**
* 日期时间字符串 转 Date
* @param dateStr yyyy-MM-dd HH:mm:ss
* @return
*/
public static Date dateTimeStrToDate(String dateStr) {
return Date.from(LocalDateTime.parse(dateStr, DATE_TIME_FORMATTER).atZone(ZoneId.systemDefault()).toInstant());
}
/**
* 获取上个月的第一天
* @return
*/
public static LocalDate getLastMonthFirstDay() {
return LocalDate.now()
.with((temporal) -> temporal.with(DAY_OF_MONTH, 1).plus(-1, MONTHS));
}
/**
* 获取上个月的最后一天
* @return
*/
public static LocalDate getLastMonthLastDay() {
return LocalDate.now().plus(-1, MONTHS)
.with(temporal -> temporal.with(DAY_OF_MONTH, temporal.range(DAY_OF_MONTH).getMaximum()));
}
/**
* 获取当月的第一天
*
* @return
*/
public static LocalDate getMonthFirstDay() {
return LocalDate.now().with(TemporalAdjusters.firstDayOfMonth());
}
/**
* 获取当月最后一天
* @return
*/
public static LocalDate getMonthLastDay() {
return LocalDate.now().with(TemporalAdjusters.lastDayOfMonth());
}
/**
* 获取下个月的第一天
*
* @return
*/
public static LocalDate getNextMonthFirstDay() {
return LocalDate.now().with(TemporalAdjusters.firstDayOfNextMonth());
}
/**
* 获取下个月的最后一天
*
* @return
*/
public static LocalDate getNextMonthLastDay() {
return LocalDate.now()
.plus(1, MONTHS)
.with(temporal -> temporal.with(DAY_OF_MONTH, temporal.range(DAY_OF_MONTH).getMaximum()));
}
/**
* 获取去年第一天
* @return
*/
public static LocalDate getLastYearFirstDay() {
return LocalDate.now()
.with((temporal) -> temporal.with(DAY_OF_YEAR, 1).plus(-1, YEARS));
}
/**
* 获取去年最后一天
* @return
*/
public static LocalDate getLastYearLastDay() {
return LocalDate.now()
.plus(-1, YEARS)
.with(temporal -> temporal.with(DAY_OF_YEAR, temporal.range(DAY_OF_YEAR).getMaximum()));
}
/**
* 获取今年第一天
* @return
*/
public static LocalDate getYearFirstDay() {
return LocalDate.now().with(TemporalAdjusters.firstDayOfYear());
}
/**
* 获取今年最后一天
* @return
*/
public static LocalDate getYearLastDay() {
return LocalDate.now().with(TemporalAdjusters.lastDayOfYear());
}
/**
* 获取明年第一天
* @return
*/
public static LocalDate getNextYearFirstDay() {
return LocalDate.now().with(TemporalAdjusters.firstDayOfNextYear());
}
/**
* 获取明年最后一天
* @return
*/
public static LocalDate getNextYearLastDay() {
return LocalDate.now()
.plus(1, YEARS)
.with(temporal -> temporal.with(DAY_OF_YEAR, temporal.range(DAY_OF_YEAR).getMaximum()));
}
/**
* 获取上个星期第一天
* @return
*/
public static LocalDate getLastWeekFirstDay() {
return LocalDate.now()
.plus(-1, WEEKS)
.with(temporal -> temporal.with(DAY_OF_WEEK, temporal.range(DAY_OF_WEEK).getMinimum()));
}
/**
* 获取上个星期最后一天
* @return
*/
public static LocalDate getLastWeekLastDay() {
return LocalDate.now()
.plus(-1, WEEKS)
.with(temporal -> temporal.with(DAY_OF_WEEK, temporal.range(DAY_OF_WEEK).getMaximum()));
}
/**
* 获取当前星期第一天
* @return
*/
public static LocalDate getWeekFirstDay() {
return LocalDate.now().with(temporal -> temporal.with(DAY_OF_WEEK, temporal.range(DAY_OF_WEEK).getMinimum()));
}
/**
* 获取当前星期最后一天
* @return
*/
public static LocalDate getWeekLastDay() {
return LocalDate.now().with(temporal -> temporal.with(DAY_OF_WEEK, temporal.range(DAY_OF_WEEK).getMaximum()));
}
/**
* 获取下个星期第一天
* @return
*/
public static LocalDate getNextWeekFirstDay() {
return LocalDate.now()
.plus(1, WEEKS)
.with(temporal -> temporal.with(DAY_OF_WEEK, temporal.range(DAY_OF_WEEK).getMinimum()));
}
/**
* 获取下个星期最后一天
* @return LocalDate
*/
public static LocalDate getNextWeekLastDay() {
return LocalDate.now()
.plus(1, WEEKS)
.with(temporal -> temporal.with(DAY_OF_WEEK, temporal.range(DAY_OF_WEEK).getMaximum()));
}
/**
* 获取某年某月的第一天
* @param year
* @param month
* @return
*/
public static LocalDate getSomeYearMonthFirstDay(int year, int month) {
return LocalDate.of(year, month, 1);
}
/**
* 获取某年某月的最后一天
* @param year
* @param month
* @return
*/
public static LocalDate getSomeYearMonthLastDay(int year, int month) {
return LocalDate.of(year, month, 1)
.with(temporal -> temporal.with(DAY_OF_MONTH, temporal.range(DAY_OF_MONTH).getMaximum()));
}
public static void main(String[] args) {
LocalDate lastDay = getSomeYearMonthLastDay(2022, 10);
System.out.println(lastDay);
}
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