Java 时间处理工具

import org.apache.commons.lang3.time.DateUtils;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Calendar;
import java.util.Date;

public class DataTimeTools {

    //dataTimeFormat 自定义设置日期格式
    public String getNowDateTime(String dataTimeFormat){
        if(dataTimeFormat == null || dataTimeFormat.length()<0)
            return getNowDateTime();
        SimpleDateFormat df = new SimpleDateFormat(dataTimeFormat);
        return df.format(new Date());
    }

    public String getNowDateTime(){
        SimpleDateFormat df = new SimpleDateFormat("yy-MM-dd HH:mm:ss");//设置日期格式
        return df.format(new Date());
    }

    public LocalDate date2LocalDate(Date date) {
        Instant instant = date.toInstant();
        ZoneId zone = ZoneId.systemDefault();
        LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);
        return localDateTime.toLocalDate();
    }

    public Date string2Date(String date) {
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        try {
            return format.parse(date);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public String timeStamp2String(String timeStamp, String format) {
        if (timeStamp == null || timeStamp.isEmpty() || timeStamp.equals("null")) {
            return "";
        }
        if (format == null || format.isEmpty()) {
            format = "yyyy-MM-dd HH:mm:ss";
        }
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(new Date(Long.valueOf(timeStamp)));
    }

    public LocalDate timeStamp2LocalDate(String timeStamp, String format) {
        return date2LocalDate(string2Date(timeStamp2String(timeStamp, format)));
    }

    public Date addDateDays(String dayTime, int days) {
        Date to = string2Date(dayTime);
        return DateUtils.addDays(to, days);
    }

    public String addDateHours(String dayTime, int hour) {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = null;
        try {
            date = format.parse(dayTime);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        if (date == null)
            return "";
        System.out.println("front:" + format.format(date)); //显示输入的日期
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.add(Calendar.HOUR, hour);// 24小时制
        date = cal.getTime();
        System.out.println("after:" + format.format(date));  //显示更新后的日期
        return format.format(date);
    }

    public Date randomDate(String beginDate,String endDate) {
        try {
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            Date start = format.parse(beginDate);
            Date end = format.parse(endDate);

            if (start.getTime() >= end.getTime()) {
                return null;
            }
            long date = random(start.getTime(), end.getTime());
            return new Date(date);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public long random(long begin,long end){
        long rtn = begin + (long)(Math.random() * (end - begin));
        if(rtn == begin || rtn == end){
            return random(begin,end);
        }
        return rtn;
    }
}