TimeUtils 时间工具类：获取当前时间及时间格式化

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;

public class TimeUtils {
    public TimeUtils() {
    }

    public static String timeOfLongToStr(Long time) {
        return timeOfLongToStr(time, "yyyy-MM-dd HH:mm:ss");
    }

    public static String timeOfLongToStr(Long time, String pattern) {
        if (time == null) {
            return null;
        } else {
            DateTimeFormatter ftf = DateTimeFormatter.ofPattern(pattern);
            return ftf.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(time), ZoneId.systemDefault()));
        }
    }

    public static String getNowTimeStr() {
        return getNowTimeStr("YYYY-MM-dd HH:mm:ss");
    }

    public static String getNowTimeStr(String pattern) {
        LocalDateTime dateTime = LocalDateTime.now();
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
        return dateTimeFormatter.format(dateTime);
    }

    public static Long timeOfStrToLong(String strTime, String pattern) {
        if (strTime == null) {
            return null;
        } else {
            DateTimeFormatter ftf = DateTimeFormatter.ofPattern(pattern);
            LocalDateTime parse = LocalDateTime.parse(strTime, ftf);
            return LocalDateTime.from(parse).atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
        }
    }
}