java计算当前日期后N个工作日的日期
如图，合同中有很多这种日期计算，故封装一通用工具类，记录于此。需求如下：
WorkDayUtils如下：
package com.sqds.utils;
import org.apache.commons.lang.StringUtils;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* 工作日计算工具类
* Created by MJ·J on 2019-05-24
*/
public class WorkDayUtils {
private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
/*private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");*/
/**
* 获取当前时间之前n个工作日的日期
*
* @param holidays 节假日（日期格式：2019-01-01,2019-01-04,2019-01-05,......）
* @param today 当前日期（日期格式：2019-01-01 08:08:08）
* @param num 需要设置的n个工作日
* @return
* @throws Exception
*/
public static String getWorkDayStart(String holidays, String today, int num) throws Exception {
// 转化为数组
String[] dayArr = holidays.split(",");
List holidayList = new ArrayList(Arrays.asList(dayArr));
// 将字符串转换成日期
Date date = sdf.parse(today);
// 获取工作日
Date workDay = getWorkDay(holidayList, num, date, -1);
String workDayStr = sdf.format(workDay);
long workTime = getTime(today, workDayStr) - 1000; // 减1秒
return sdf.format(new Date(workTime));
}
/**
* 获取当前时间之后n个工作日的日期
*
* @param dd 当前日期
* @param num 需要设置的n个工作日
* @return
* @throws Exception
*/
public static Date getWorkDayEnd( Date dd, int num) throws Exception {
// 节假日
String holidays = "2019-01-01,2019-01-04,2019-01-05,2019-01-06,2019-01-07,2019-01-08,2019-01-09,2019-01-10,2019-04-05,2019-04-06,2019-04-07,2019-05-01,2019-06-07,2019-06-08,2019-06-09,2019-09-13,2019-09-14,2019-09-15,2019-10-01,2019-10-02,2019-10-03,2019-10-04,2019-10-05,2019-10-06,2019-10-07";
// 当前时间
String today = sdf.format(dd);
// 转化为数组
String[] dayArr = holidays.split(",");
List holidayList = new ArrayList(Arrays.asList(dayArr));
// 将字符串转换成日期
Date date = sdf.parse(today);
// 获取工作日
Date workDay = getWorkDay(holidayList, num, date, 1);
String workDayStr = sdf.format(workDay);
long workTime = getTime(today, workDayStr) + 1000; // 加1秒
return new Date(workTime);
}
/**
* 获取当前时间之后n个工作日的日期
*
* @param holidays 节假日（日期格式：2019-01-01,2019-01-04,2019-01-05,......）
* @param today 当前日期（日期格式：2019-01-01 08:08:08）
* @param num 需要设置的n个工作日
* @return
* @throws Exception
*/
public static String getWorkDayEnd(String holidays, String today, int num) throws Exception {
// 转化为数组
String[] dayArr = holidays.split(",");
List holidayList = new ArrayList(Arrays.asList(dayArr));
// 将字符串转换成日期
Date date = sdf.parse(today);
// 获取工作日
Date workDay = getWorkDay(holidayList, num, date, 1);
String workDayStr = sdf.format(workDay);
long workTime = getTime(today, workDayStr) + 1000; // 加1秒
return sdf.format(new Date(workTime));
}
/**
* 获取当前时间之后n个工作日的日期
* @param today 当前日期（日期格式：2019-01-01 08:08:08）
* @param num 需要设置的n个工作日
* @return
* @throws Exception
*/
public static String getWorkDayEnd( String today, int num) throws Exception {
// 节假日
String holidays = "2019-01-01,2019-01-04,2019-01-05,2019-01-06,2019-01-07,2019-01-08,2019-01-09,2019-01-10,2019-04-05,2019-04-06,2019-04-07,2019-05-01,2019-06-07,2019-06-08,2019-06-09,2019-09-13,2019-09-14,2019-09-15,2019-10-01,2019-10-02,2019-10-03,2019-10-04,2019-10-05,2019-10-06,2019-10-07";
// 转化为数组
String[] dayArr = holidays.split(",");
List holidayList = new ArrayList(Arrays.asList(dayArr));
// 将字符串转换成日期
Date date = sdf.parse(today);
// 获取工作日
Date workDay = getWorkDay(holidayList, num, date, 1);
String workDayStr = sdf.format(workDay);
long workTime = getTime(today, workDayStr) + 1000; // 加1秒
return sdf.format(new Date(workTime));
}
/**
* 获取工作日
*
* @param holidayList 节假日（日期格式：2019-01-01,2019-01-04,2019-01-05,......）
* @param num 需要设置的n个工作日
* @param day 目标日期
* @return
* @throws Exception
*/
public static Date getWorkDay(List holidayList, int num, Date day, int n) throws Exception {
int delay = 1;
while (delay <= num) {
// 获取前一天或后一天日期
Date endDay = getDate(day, n);
String time = sdf.format(endDay);
//当前日期+1即tomorrow,判断是否是节假日,同时要判断是否是周末,都不是则将scheduleActiveDate日期+1,直到循环num次即可
if (!isWeekend(time) && !isHoliday(time, holidayList)) {
delay++;
}/* else if (isWeekend(time)) {
System.out.println(time + "::是周末");
} else if (isHoliday(time, holidayList)) {
System.out.println(time + "::是节假日");
}*/
day = endDay;
}
return day;
}
/**
* yyyy-MM-dd HH:mm:ss格式日期---获取时间戳精确到秒
*
* @param start 开始日期（日期格式：2019-01-01 08:08:08）
* @param end 结束日期（日期格式：2019-01-01 08:08:08）
* @return
* @throws Exception
*/
public static long getTime(String start, String end) throws Exception {
if (org.apache.commons.lang.StringUtils.isEmpty(start) || StringUtils.isEmpty(end)) {
throw new RuntimeException("today is empty");
}
long time1 = sdf.parse(start).getTime();
long time2 = sdf.parse(start).getTime();
long time3 = sdf.parse(end).getTime();
long time = time3 + (time1 - time2);
return time;
}
/**
* 获取前一天或后一天日期
*
* @param date 日期
* @param n 判断参数
* @return
*/
public static Date getDate(Date date, int n) {
if (n > 0) { // 获取前一天
date = getTomorrow(date);
}
if (n < 0) { // 获取后一天
date = getYesterday(date);
}
return date;
}
/**
* 获取后一天的日期
*
* @param date
* @return
*/
public static Date getTomorrow(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DAY_OF_MONTH, +1);
date = calendar.getTime();
return date;
}
/**
* 获取前一天的日期
*
* @param date
* @return
*/
public static Date getYesterday(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DAY_OF_MONTH, -1);
date = calendar.getTime();
return date;
}
/**
* 判断是否是周末
*
* @param sdate
* @return
* @throws Exception
*/
public static boolean isWeekend(String sdate) throws Exception {
Date date = sdf.parse(sdate);
Calendar cal = Calendar.getInstance();
cal.setTime(date);
if (cal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY || cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
return true;
} else {
return false;
}
}
/**
* 判断是否是节假日
*
* @param sdate
* @param list
* @return
* @throws Exception
*/
public static boolean isHoliday(String sdate, List list) throws Exception {
if (list.size() > 0) {
for (int i = 0; i < list.size(); i++) {
if (sdate.equals(list.get(i))) {
return true;
}
}
}
return false;
}
}