改变时间戳精度

package com.gddxit.pipenetwork.monitor.web.result.handler;

import com.gddxit.dxbase.core.common.util.TimeUtils;

import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.LinkedList;
import java.util.List;

/**
 * Created by dengrq on 2018/9/12.
 */
public class Dome2 {
    public static void main(String[] args) throws ParseException {
        List<Timestamp> timeList = new ArrayList<>();
       // String s = "HOUR";
        Timestamp startTime = new Timestamp(1536738444000L);
        Timestamp endTime = new Timestamp(1718013491000L);
        System.out.println(startTime);
        List<Timestamp> list = new ArrayList<>();
        list = getFormat("yyyy-MM-dd HH:00:00:000",startTime,endTime);
        timeList = TimeUtils.getHourArrayByRange(1, list.get(0), list.get(1));
        //timeList = getYearArrayByRange(1, list.get(0), list.get(1));

        System.out.println(startTime.getTime());

        //System.out.println(startTime.getTime());
        for (Timestamp timestamp:timeList
        ) {
           // System.out.println(timestamp.getTime());
        }
    }
    public  static List<Timestamp> getFormat(String form ,Timestamp startTime,Timestamp endTime) throws ParseException {
        List<Timestamp> list = new LinkedList();
        SimpleDateFormat sdf = new SimpleDateFormat(form);
        System.out.println(startTime);
        System.out.println(sdf.format(startTime));
        System.out.println(sdf.parse(sdf.format(startTime)));
        Timestamp startTime1 = new Timestamp(sdf.parse(sdf.format(startTime)).getTime());
        Timestamp  endTime1= new Timestamp(sdf.parse(sdf.format(endTime)).getTime());
        list.add(startTime1);
        list.add(endTime1);
        return list;
    }

    public static List<Timestamp> getYearArrayByRange(int interval, Timestamp startTime, Timestamp endTime) {
        List<Timestamp> list = new LinkedList();
        if (startTime == null) {
            startTime = endTime;
        }

        if (endTime == null) {
            endTime = startTime;
        }

        if (startTime.equals(endTime)) {
            list.add(getYear(startTime));
            return list;
        } else {
            Timestamp time = getYear(startTime);

            do {
                do {
                    list.add(time);
                    time = addMonth(time, interval);
                } while (time.equals(getYear(endTime)));
            } while (time.before(getYear(endTime)));

            return list;
        }
    }

    public static Timestamp getYear(Timestamp timestamp) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(timestamp);
        calendar.set(5, 1);
        calendar.set(11, 0);
        calendar.set(12, 0);
        calendar.set(13, 0);
        calendar.set(14, 0);
        return new Timestamp(calendar.getTime().getTime());
    }

    public static Timestamp addMonth(Timestamp date, Integer num) {
        Calendar calendar = addCalendar(date, num, 1);
        return new Timestamp(calendar.getTime().getTime());
    }

    private static Calendar addCalendar(Timestamp date, int num, int field) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(field, num);
        return calendar;
    }
}