技術標籤：java基礎

記錄一下，常用的時間轉換，後面慢慢補充：

public class TimeUtils {

    public static long getLongTime(String time) {
        if (time == null) {
            return System.currentTimeMillis();
        }

        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"
 
);
        LocalDateTime localDateTime;
        try {
            localDateTime = LocalDateTime.parse(time, dateTimeFormatter);
            return LocalDateTime.from(localDateTime).atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
        } catch (DateTimeException e) {
        }

        return
 
 System.currentTimeMillis();
    }

    public static Date toDate(Long time) {
        return new Date(time);
    }

    public static Date toDate(String time) {
        long longTime = getLongTime(time);
        return toDate(longTime);
    }

    public static String toStrDate(Date date) {
        if
 
 (date == null) {
            return "";
        }
        LocalDateTime dateTime = LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        try {
            return dateTimeFormatter.format(dateTime);
        } catch (DateTimeException e) {
        }
        return "";
    }
}