时间戳、时间的相互转换 java

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

public class TestDate {
    /**
     * 时间戳转换时间
     */
   public  String stampToDate(String s){
       SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");
       Long lt = new Long(s);
       Date date = new Date(lt);
       String str = simpleDateFormat.format(lt);
       return str;
   }

    /**
     * 时间转换为时间戳
     */
    public String dateToStamp(String s) throws ParseException {
        DateFormat DateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = DateFormat.parse(s);
        long lt = date.getTime();
        String v = String.valueOf(lt);
        return v;
    }

    /*public Long dateToStamp2(Long s) throws Exception {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = simpleDateFormat.parse(s);
        long lt = date.getTime();
        return lt;
    }*/

    public static void main(String[] args) throws ParseException {
        /**
         * 时间戳转换时间
         */
        TestDate day = new TestDate();
        String v = day.stampToDate("1598328000000");
        System.out.println(v);

        /**
         * 时间转换时间戳
         */
        /*Long date = new Date().getTime();
        String s = String.valueOf(date);
        System.out.println(s);
        TestDate td = new TestDate();
        String s1 = td.dateToStamp(s);
        System.out.println(s1);*/
    }
}