java获取本周所有日期，和本周第一天和最后一天，和上周所有日期，和上周第一天和上周最后一天

import javatextSimpleDateFormat;import javautilCalendar;import javautilDate;public class Main {private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");public static void main(String args[]) {Date d = new Date();// 月初Systemoutprintln("月初" + sdfformat(getMonthStart(d)));// 月末Systemoutprintln("月末" + sdfformat(getMonthEnd(d)));Date date = getMonthStart(d);Date monthEnd = getMonthEnd(d);while (!dateafter(monthEnd)) {Systemoutprintln(sdfformat(date));date = getNext(date);}}private static Date getMonthStart(Date date) {Calendar calendar = CalendargetInstance();calendarsetTime(date);int index = calendarget(CalendarDAY_OF_MONTH);calendaradd(CalendarDATE, (1 - index));return calendargetTime();}private static Date getMonthEnd(Date date) {Calendar calendar = CalendargetInstance();calendarsetTime(date);calendaradd(CalendarMONTH, 1);int index = calendarget(CalendarDAY_OF_MONTH);calendaradd(CalendarDATE, (-index));return calendargetTime();}private static Date getNext(Date date) {Calendar calendar = CalendargetInstance();calendarsetTime(date);calendaradd(CalendarDATE, 1);return calendargetTime();}} 这是一个月的你改改就能写出上个月的了吧

public static void main(String[] agrs) {

String newtime="2013-8-4";

Systemoutprintln(newtime+""+testDate(newtime));

}

public static String testDate(String newtime) {

String dayNames[] = {"星期日","星期一","星期二","星期三","星期四","星期五","星期六"};

int week1[] = {7,1,2,3,4,5,6};

Calendar c = CalendargetInstance();// 获得一个日历的实例

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

try {

csetTime(sdfparse(newtime));

} catch (ParseException e) {

// TODO Auto-generated catch block

eprintStackTrace();

}

String a=dayNames[cget(CalendarDAY_OF_WEEK)-1];

int b=week1[cget(CalendarDAY_OF_WEEK)-1];

if(b!=7){

cset(CalendarDAY_OF_WEEK, CalendarMONDAY);

}else{

cadd(CalendarWEEK_OF_MONTH, -1);

cset(CalendarDAY_OF_WEEK, 2);

}

for(int i=1;i<b;i++){

if(i==1){

Systemoutprintln(sdfformat(cgetTime()));//本周一

}

cadd(CalendarDATE,1);

Systemoutprintln(sdfformat(cgetTime()));

}

Systemoutprintln("-------------");

return a;

}

测试结果：

2013-07-29

2013-07-30

2013-07-31

2013-08-01

2013-08-02

2013-08-03

2013-08-04

-------------

2013-8-4星期日

第几周是该月的第几周吗 还是该年的第几周

下面的程序包含了2种情况, 请自行选择

package comcalender;

import javautilCalendar;

import javautilLocale;

/

输出某周的日期

演示Calendar的用法

Calendar的使用一般分2步,

1确定某天, 调用set函数

2可以取出该天的任意信息, 通过get函数

@author: zhuby

@create date:2011-1-17

/

public class WeekCalendar {

/

周计数,为全年中的周计数

@param year

@param weekCount

@return

/

public int[] getWeekDateByWeekInYear(int year,int weekCount){

Calendar cal=CalendargetInstance(LocaleCHINA);

//设置calendar的日期,此处可以确定某一天

calset(CalendarYEAR, year);

calset(CalendarWEEK_OF_YEAR, weekCount);

//获取该天的信息(理论而言,通过改变get函数的参数,可以获取该天的任意信息)

int day=calget(CalendarDAY_OF_YEAR);

int[] days=new int[7];

for(int i=0;i<7;i++){

days[i]=calget(CalendarDAY_OF_MONTH);

// Systemoutprint((calget(CalendarMONTH)+1)+"月"+calget(CalendarDAY_OF_MONTH)+"日 ");

day++;

calset(CalendarDAY_OF_YEAR, day);

}

return days;

}

/

周计数为月中的周计数

@param year

@param month

@param weekCount

@return

/

public int[] getWeekDateByWeekInMonth(int year,int month,int weekCount){

Calendar cal=CalendargetInstance(LocaleCHINA);

calset(CalendarYEAR, year);

calset(CalendarMONTH, month-1);

calset(CalendarWEEK_OF_MONTH, weekCount);

int day=calget(CalendarDAY_OF_YEAR);

int[] days=new int[7];

for(int i=0;i<7;i++){

days[i]=calget(CalendarDAY_OF_MONTH);

// Systemoutprint((calget(CalendarMONTH)+1)+"月"+calget(CalendarDAY_OF_MONTH)+"日 ");

day++;

calset(CalendarDAY_OF_YEAR, day);

}

return days;

}

public static void main(String[] args) {

WeekCalendar wc=new WeekCalendar();

for(int i=0;i<7;i++){

Systemoutprint(wcgetWeekDateByWeekInYear(2011, 7)[i]+" ");

}

Systemoutprintln();

for(int i=0;i<7;i++){

Systemoutprint(wcgetWeekDateByWeekInMonth(2011,4, 2)[i]+" ");

}

}

}

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