package cn.com.utils;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import org.springframework.expression.ParseException;
/**
* 获取某一时间段特定星期几的日期
* @author
*
*/
public class WeekDayUtil {
public static void main(String[] args) throws java.text.ParseException {
getDates("2018-05-27", "2018-06-11","Saturday|Sunday");
}
/**
* 获取某一时间段特定星期几的日期
* @param dateFrom 开始时间
* @param dateEnd 结束时间
* @param weekDays 星期
* @return 返回时间数组
* @throws java.text.ParseException
*/
public static String[] getDates(String dateFrom, String dateEnd, String weekDays) throws java.text.ParseException {
long time = 1l;
long perDayMilSec = 24 * 60 * 60 * 1000;
List<String> dateList = new ArrayList<String>();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
//需要查询的星期系数
String strWeekNumber = weekForNum(weekDays);
try {
dateFrom = sdf.format(sdf.parse(dateFrom).getTime() - perDayMilSec);
while (true) {
time = sdf.parse(dateFrom).getTime();
time = time + perDayMilSec;
Date date = new Date(time);
dateFrom = sdf.format(date);
if (dateFrom.compareTo(dateEnd) <= 0) {
//查询的某一时间的星期系数
Integer weekDay = dayForWeek(date);
//判断当期日期的星期系数是否是需要查询的
if (strWeekNumber.indexOf(weekDay.toString())!=-1) {
System.out.println(dateFrom);
dateList.add(dateFrom);
}
} else {
break;
}
}
} catch (ParseException e1) {
e1.printStackTrace();
}
String[] dateArray = new String[dateList.size()];
dateList.toArray(dateArray);
return dateArray;
}
//等到当期时间的周系数。Sunday：1，Monday：2，Tuesday：3，Wednesday：4，Thursday：5，Friday：6，Saturday：7
public static Integer dayForWeek(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.DAY_OF_WEEK);
}
/**
* 得到对应星期的系数 Sunday：1，Monday：2，Tuesday：3，Wednesday：4，Thursday：5，Friday：6，Saturday：7
* @param weekDays 星期格式 Monday|Tuesday
*/
public static String weekForNum(String weekDays){
//返回结果为组合的星期系数
String weekNumber = "";
//解析传入的星期
if(weekDays.indexOf("|")!=-1){//多个星期数
String []strWeeks = weekDays.split("\\|");
for(int i=0;i<strWeeks.length;i++){
weekNumber = weekNumber + "" + getWeekNum(strWeeks[i]).toString();
}
}else{//一个星期数
weekNumber = getWeekNum(weekDays).toString();
}
return weekNumber;
}
//将星期转换为对应的系数 Sunday：1，Monday：2，Tuesday：3，Wednesday：4，Thursday：5，Friday：6，Saturday：7
public static Integer getWeekNum(String strWeek){
Integer number = 1;//默认为Sunday
if("Sunday".equals(strWeek)){
number = 1;
}else if("Monday".equals(strWeek)){
number = 2;
}else if("Tuesday".equals(strWeek)){
number = 3;
}else if("Wednesday".equals(strWeek)){
number = 4;
}else if("Thursday".equals(strWeek)){
number = 5;
}else if("Friday".equals(strWeek)){
number = 6;
}else if("Saturday".equals(strWeek)){
number = 7;
}
return number;
}
}
package cn.com.utils;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
/**
* 获取时间段内所有日期
*
*/
public class FindDates {
public static void main(String[] args) throws Exception {
Calendar cal = Calendar.getInstance();
String start = "2018-05-25";
String end = "2018-06-30";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date dBegin = sdf.parse(start);
Date dEnd = sdf.parse(end);
List<Date> lDate = findDates(dBegin, dEnd);
for (Date date : lDate) {
System.out.println(sdf.format(date));
}
}
public static List<Date> findDates(Date dBegin, Date dEnd) {
List lDate = new ArrayList();
lDate.add(dBegin);
Calendar calBegin = Calendar.getInstance();
// 使用给定的 Date 设置此 Calendar 的时间
calBegin.setTime(dBegin);
Calendar calEnd = Calendar.getInstance();
// 使用给定的 Date 设置此 Calendar 的时间
calEnd.setTime(dEnd);
// 测试此日期是否在指定日期之后
while (dEnd.after(calBegin.getTime())) {
// 根据日历的规则，为给定的日历字段添加或减去指定的时间量
calBegin.add(Calendar.DAY_OF_MONTH, 1);
lDate.add(calBegin.getTime());
}
return lDate;
}
}
package cn.com.utils;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
/**
* 对List中的日期进行排序
* @author yf
*/
public class DateSort {
public static void main(String[] args) {
List dateList = new ArrayList();
System.err.println("----before sort:");
for (int i = 0; i < 5; i++) {// 随机生成五个日期
Date d = new Date(System.currentTimeMillis() + (int) (Math.random() * 1000000000));
dateList.add(d);
System.out.println(formatDate(d));// 格式化了日期
// System.out.println(d);//未格式化日期
}
ComparatorDate c = new ComparatorDate();
Collections.sort(dateList, c);
System.err.println("----after sort:");
for (Object date : dateList) {
System.out.println(formatDate(date));// 格式化了日期
// System.out.println(date);//未格式化日期
}
}
/**
* 格式化日期，返回字符串形式，形如"yyyy-MM-dd"
*
* @param date
* @return
*/
private static String formatDate(Object date) {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
return dateFormat.format(date);
}
}
class ComparatorDate implements Comparator {
public int compare(Object obj1, Object obj2) {
Date begin = (Date) obj1;
Date end = (Date) obj2;
if (begin.after(end)) {
return 1;
} else {
return -1;
}
}
}
