记住:Calendar 是个非常强大的类,你的需求很简单,给你代码吧,我有注释的/* * 创建日期 2005-3-30package com.infoearth;import java.sql.Timestamp; import java.text.SimpleDateFormat; import java.util.*; /** * @毛爷爷 * public class ManageWeek { //判断两个日期是否在同一周 boolean isSameWeekDates(Date date1, Date date2) { Calendar cal1 = Calendar.getInstance(); Calendar cal2 = Calendar.getInstance(); cal1.setTime(date1); cal2.setTime(date2); int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR); if (0 == subYear) { if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR)) return true; } else if (1 == subYear && 11 == cal2.get(Calendar.MONTH)) { // 如果12月的最后一周横跨来年第一周的话则最后一周即算做来年的第一周 if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR)) return true; } else if (-1 == subYear && 11 == cal1.get(Calendar.MONTH)) { if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR)) return true; } return false; }
//产生周序列 public static String getSeqWeek(){ Calendar c = Calendar.getInstance(Locale.CHINA); String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR)); if(week.length()==1)week = "0" + week; String year = Integer.toString(c.get(Calendar.YEAR)); return year+week;
}
//获得周一的日期 public static String getMonday(Date date){ Calendar c = Calendar.getInstance(); c.setTime(date); c.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY); return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime()); }
//获得周五的日期 public static String getFriday(Date date){ Calendar c = Calendar.getInstance(); c.setTime(date); c.set(Calendar.DAY_OF_WEEK,Calendar.FRIDAY); return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
* 创建日期 2005-3-30package com.infoearth;import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* @毛爷爷
*
public class ManageWeek {
//判断两个日期是否在同一周
boolean isSameWeekDates(Date date1, Date date2) {
Calendar cal1 = Calendar.getInstance();
Calendar cal2 = Calendar.getInstance();
cal1.setTime(date1);
cal2.setTime(date2);
int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR);
if (0 == subYear) {
if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
return true;
}
else if (1 == subYear && 11 == cal2.get(Calendar.MONTH)) {
// 如果12月的最后一周横跨来年第一周的话则最后一周即算做来年的第一周
if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
return true;
}
else if (-1 == subYear && 11 == cal1.get(Calendar.MONTH)) {
if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
return true;
}
return false;
}
//产生周序列
public static String getSeqWeek(){
Calendar c = Calendar.getInstance(Locale.CHINA);
String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));
if(week.length()==1)week = "0" + week;
String year = Integer.toString(c.get(Calendar.YEAR));
return year+week;
}
//获得周一的日期
public static String getMonday(Date date){
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY);
return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
}
//获得周五的日期
public static String getFriday(Date date){
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK,Calendar.FRIDAY);
return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
}
public static void main(String[] args){ }}
oDate.set(2005,11 -1,15); oDate.roll(Calendar.DATE,(-1) * (oDate.get(Calendar.DAY_OF_WEEK)));
for (int i = 1;i<8;i++){
oDate.roll(Calendar.DATE,1);
System.out.println(oDate.get(Calendar.YEAR) + "-" +
(oDate.get(Calendar.MONTH) + 1) + "-" +
oDate.get(Calendar.DATE));
}
roll方法用了add来替换。 Calendar oDate = Calendar.getInstance();
oDate.set(2005,11 -1,15); oDate.roll(Calendar.DATE,(-1) * (oDate.get(Calendar.DAY_OF_WEEK)));
for (int i = 1;i<8;i++){
oDate.add(Calendar.DATE,1);
System.out.println(oDate.get(Calendar.YEAR) + "-" +
(oDate.get(Calendar.MONTH) + 1) + "-" +
oDate.get(Calendar.DATE));
}
oDate.set(2005,11 -1,15);oDate.add(Calendar.DATE,(-1) * (oDate.get(Calendar.DAY_OF_WEEK)));
for (int i = 1;i<8;i++){
oDate.add(Calendar.DATE,1);
System.out.println(oDate.get(Calendar.YEAR) + "-" +
(oDate.get(Calendar.MONTH) + 1) + "-" +
oDate.get(Calendar.DATE));
}
Calendar oDate = Calendar.getInstance();
oDate.set(2005,11 -1,15);oDate.add(Calendar.DATE,(-1) * (oDate.get(Calendar.DAY_OF_WEEK)));
for (int i = 1;i<8;i++){
oDate.add(Calendar.DATE,1);
System.out.println(oDate.get(Calendar.YEAR) + "-" +
(oDate.get(Calendar.MONTH) + 1) + "-" +
oDate.get(Calendar.DATE));
}
不用在ICIIC(毛爷爷)的那么长的一段代码了吧!
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY);
return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
}
这个方法是不是可以获得任何日期所在周的周一的日期啊!
例如2005-11-15把这个传进去是不是就获得了2005-11-13的日期了啊!
getMonday(2005-11-15)返回的是不是2005-11-13
你写的获得周几日期的方法对吗 ?
别人辛辛苦苦的帮助你,你却不动手试验,还发这样的疑问。还有谁会帮助你?