13位时间戳与格式化日期之间的转换实现

package test.java;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import static java.lang.System.currentTimeMillis;

/***
 * @description: 时间戳转换
 * @author: 你的ID
 * @create: 2019-09-04 11:42
 **/
public class TimeStamp {

    private static SimpleDateFormat sf = null;
    public static void main(String[] args) {

        long time = currentTimeMillis();//获取当前时间精确到毫秒级的时间戳，例：1525849325942

        System.out.println(timeStamp2Date(time));
        System.out.println(time);
        String time1="2021-09-04 13:10:24";
        System.out.println(getStringToDate(time1));

    }
//时间戳转换成时间格式
    public static String timeStamp2Date(long time) {
        Long timeLong = Long.parseLong(String.valueOf (time));
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//要转换的时间格式
        Date date;
        try {
            date = sdf.parse(sdf.format(timeLong));
            return sdf.format(date);
        } catch (ParseException e) {
            e.printStackTrace();
            return null;
        }
    }

//时间格式转换成时间戳

public static long getStringToDate(String time) { sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date date = new Date(); try{ date = sf.parse(time); } catch(ParseException e) { e.printStackTrace(); } return date.getTime(); } }