package com.qr.management.util;

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

public class DateUtils {

    private static SimpleDateFormat sf = null;


    /**
     * 获取当天日期yyyyMMdd
     * @return
     */
    public static String getStrDate(){
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
        return sdf.format(date);
    }

    /**
     * 获取系统时间
     */
    public static String getCurrentDate() {
        Date d = new Date();
        sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return sf.format(d);
    }

    /**
     * 时间戳转换成字符串
     */
    public static String getDateToString(long time) {
        Date d = new Date(time);
        //sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        sf = new SimpleDateFormat("yyyy-MM-dd");
        return sf.format(d);
    }

    /**
     * 将字符串转为时间戳
     */
    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();
    }

    /**
     * 直接获取时间戳
     */
    public static String getTimeStamp() {
        String currentDate = getCurrentDate();
        sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = new Date();
        try {
            date = sf.parse(currentDate);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return String.valueOf(date.getTime());
    }

}