Date与LocalDateTime/LocalDate/LocalTime互转工具类

素颜马尾好姑娘i 2022-11-17 14:42 169阅读 0赞

Date与Java8的时间之间的相互转换必须通过一个中间类Instant。

import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.time.*;
    import java.time.format.DateTimeFormatter;
    import java.util.Date;
    
    /**
     * 日期转换工具类
     *
     * @author Lenovo
     */
    public class DateUtil {
    
        public static LocalDateTime date2LocalDateTime(Date date) {
            Instant instant = date.toInstant();
            return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
        }
    
        public static LocalDate date2LocalDate(Date date) {
            Instant instant = date.toInstant();
            return LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalDate();
        }
    
        public static LocalTime date2LocalTime(Date date) {
            Instant instant = date.toInstant();
            return LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalTime();
        }
    
        public static Date localDateTime2Date(LocalDateTime localDateTime) {
            Instant instant = localDateTime.atZone(ZoneId.systemDefault()).toInstant();
            return Date.from(instant);
        }
    
        public static Date localDate2Date(LocalDate localDate) {
            Instant instant = localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant();
            return Date.from(instant);
        }
    
        public static Date localTime2Date(LocalTime localTime) {
            Instant instant = LocalDateTime.of(LocalDate.now(), localTime).atZone(ZoneId.systemDefault()).toInstant();
            return Date.from(instant);
        }
    
        public static LocalDateTime parseString2LocalDateTime(String str, String pattern) {
            if (pattern == null) {
                DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
                return LocalDateTime.parse(str, df);
            }
            return LocalDateTime.parse(str, DateTimeFormatter.ofPattern(pattern));
        }
        //解析带T的时间字符串
        public static Date parseString2Date(String str) throws ParseException {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd\'T\'HH:mm:ss");
            Date date = sdf.parse(str);
            return date;
        }
    }