Java中获取本周内所有日期

Posted 2023-04-01

在Java中获取本周内所有日期，并按中国人传统，周一为第一天开始计算

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class DataTest 

public static void main(String[] args) 
printWeekdays();


private static final int FIRST_DAY = Calendar.MONDAY;

private static void printWeekdays() 
Calendar calendar = Calendar.getInstance();
setToFirstDay(calendar);
for (int i = 0; i < 7; i++) 
printDay(calendar);
calendar.add(Calendar.DATE, 1);



private static void setToFirstDay(Calendar calendar) 
while (calendar.get(Calendar.DAY_OF_WEEK) != FIRST_DAY) 
calendar.add(Calendar.DATE, -1);



private static void printDay(Calendar calendar) 
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd EE");
System.out.println(dateFormat.format(calendar.getTime()));

参考技术A SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
// 今天是一周中的第几天
int dayOfWeek = c.get(Calendar.DAY_OF_WEEK );

if (c.getFirstDayOfWeek() == Calendar.SUNDAY) 
c.add(Calendar.DAY_OF_MONTH, 1);

// 计算一周开始的日期
c.add(Calendar.DAY_OF_MONTH, -dayOfWeek);

for (int i=1;i<=7;i++) 
c.add(Calendar.DAY_OF_MONTH, 1);
System.out.println(sdf.format(c.getTime()));

参考技术B public static void main(String[] args)
Calendar cal = Calendar.getInstance();
int date = cal.get(Calendar.DAY_OF_MONTH);
int n = cal.get(Calendar.DAY_OF_WEEK);
if (n == 1)
n = 7;
else
n = n - 1;

System.out.println("当天为本周第" + n + "天");
// 日期格式
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
for (int i = 1; i <= 7; i++)
cal.set(Calendar.DAY_OF_MONTH, date + i - n);
System.out.println("本周第" + i + "天：" + sdf.format(cal.getTime()));



结果：
当天为本周第3天
本周第1天：2014-02-17
本周第2天：2014-02-18
本周第3天：2014-02-19
本周第4天：2014-02-20
本周第5天：2014-02-21
本周第6天：2014-02-22
本周第7天：2014-02-23

java 获得本周一到周五的日期

比如说现在 怎么获得 2013-4-8 到2013-4-12

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Calendar;
public class WorkDay
public static void main(String[] args)
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd E");
for (Date date : getWeekDay())
System.out.println(dateFormat.format(date));


public static Date[] getWeekDay()
Calendar calendar = Calendar.getInstance();
while (calendar.get(Calendar.DAY_OF_WEEK) != Calendar.MONDAY)
calendar.add(Calendar.DAY_OF_WEEK, -1);

Date[] dates = new Date[5];
for (int i = 0; i &lt; 5; i++)
dates[i] = calendar.getTime();
calendar.add(Calendar.DATE, 1);

return dates;

如果每周指的是从星期一开始，那么这个程序可以达到你的要求。

如果每周指得是从星期日开始，那么请说明，我再修改。

参考技术A package com.test;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class Test
public static void main(String[] args)
Calendar cal = Calendar.getInstance();
//cal.set(2002, 2, 28);// 2002-03-28 星期四
System.out.println("今天是：" + cal.get(Calendar.YEAR)
+ (cal.get(Calendar.MONTH) + 1)//Month 值是基于 0 的。例如，0 表示 January
+ cal.get(Calendar.DAY_OF_MONTH));
System.out.println("星期" + getBigWeek(cal.get(Calendar.DAY_OF_WEEK)));
int flag = cal.get(Calendar.DAY_OF_WEEK);
cal.add(Calendar.DATE, 1-flag);
/////////////////////
System.out.println("本周从");
System.out.println("" + cal.get(Calendar.YEAR)
+ (cal.get(Calendar.MONTH) + 1)//Month 值是基于 0 的。例如，0 表示 January
+ cal.get(Calendar.DAY_OF_MONTH));
System.out.println("星期" + getBigWeek(cal.get(Calendar.DAY_OF_WEEK)));
/////////////////////////
System.out.println("到");
cal.add(Calendar.DATE, 6);
///////////////////////
System.out.println("" + cal.get(Calendar.YEAR)
+ (cal.get(Calendar.MONTH) + 1)//Month 值是基于 0 的。例如，0 表示 January
+ cal.get(Calendar.DAY_OF_MONTH));
System.out.println("星期" + getBigWeek(cal.get(Calendar.DAY_OF_WEEK)));

public static String getBigWeek(int dayofweek)
//Calendar中1-星期天，2-星期一，3-星期二，4-星期三，5-星期四，6-星期五，7-星期六
String[] wee = "", "天", "一", "二", "三", "四", "五", "六" ;
return wee[dayofweek];

参考技术B

不要这么麻烦好么，都闪开，我来

import java.time.DayOfWeek;
import java.time.LocalDate;

LocalDate today = LocalDate.now();
LocalDate toweekMonday = today.with(DayOfWeek.MONDAY);

就这么简单

参考技术C public static void main(String[] args)
Calendar cal=new GregorianCalendar();
cal.setFirstDayOfWeek(Calendar.MONDAY);
cal.setTime(new Date());
cal.set(Calendar.DAY_OF_WEEK, cal.getFirstDayOfWeek());
Date first=cal.getTime();
cal.set(Calendar.DAY_OF_WEEK, cal.getFirstDayOfWeek() + 4);
Date last=cal.getTime();
SimpleDateFormat formater=new SimpleDateFormat("yyyy-MM-dd");
System.out.println("本周周一："+formater.format(first));
System.out.println("本周周五："+formater.format(last));
参考技术D 这个是万年历，可以参考一下
import java.util.Scanner;
public class 万年历
static Scanner input = new Scanner(System.in);
static int sumYear = 0;
static int sumMonth = 0;
static int inputYear = 0;
static int inputMonth = 0;
static int firstDay = 0;
static int days = 0;
public static void main(String[] args)
inputDate();
totalyear();
totalmonth();
printCalender();

public static void inputDate()
System.out.println("请输入年份\n");
inputYear = input.nextInt();
System.out.println("请输入月份\n");
inputMonth = input.nextInt();

public static void totalyear()
for (int year = 1900; year < inputYear; year++)
if (year % 400 == 0 || year % 4 == 0 && year % 100 != 0)
sumYear = sumYear + 366;
else
sumYear = sumYear + 365;



public static void totalmonth()

for(int month=1;month<=inputMonth;month++)

switch(month)

case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
days=31;
sumMonth = sumMonth+31;
break;
case 4:
case 6:
case 9:
case 11:
days=30;
sumMonth = sumMonth+30;
break;
case 2:
if(inputYear%400==0||inputYear%4==0&&inputYear%100!=0)

days=29;
sumMonth = sumMonth+29;

else

days=28;
sumMonth = sumMonth+28;

break;




public static void printCalender()
System.out.println(" " + inputYear + "年" + inputMonth + "\n");
System.out.println("星期日\t星期一\t星期二\t星期三\t星期四\t星期五\t星期六\n");
firstDay = (sumYear + sumMonth-days + 1) % 7;
for (int i = 0; i < firstDay; i++)
System.out.print("\t");

for (int i = 1; i <= days; i++)
System.out.print(i + "\t");
if ((sumYear + sumMonth-days + i) % 7 == 6)
System.out.println("\n");