文件名称：java时间处理工具类--CalendarUtil(java源码)
文件大小：713B
文件格式：RAR
更新时间：2013-02-03 12:47:52
java,date,calendar,时间处理,获得所在星期的第一天
package com.hexiang.utils; import java.text.SimpleDateFormat; import java.util.*; public class CalendarUtil { public static void main(String args[]) { System.out.println("First day of week is : " + new SimpleDateFormat("yyyy-MM-dd") .format(getFirstDateByWeek(new Date()))); System.out.println("Last day of week is : " + new SimpleDateFormat("yyyy-MM-dd") .format(getLastDateByWeek(new Date()))); System.out.println("First day of month is : " + new SimpleDateFormat("yyyy-MM-dd") .format(getFirstDateByMonth(new Date()))); System.out.println("Last day of month is : " + new SimpleDateFormat("yyyy-MM-dd") .format(getLastDateByMonth(new Date()))); } /** * 获得所在星期的第一天 */ public static Date getFirstDateByWeek(Date date) { Calendar now = Calendar.getInstance(); now.setTime(date); int today = now.get(Calendar.DAY_OF_WEEK); int first_day_of_week = now.get(Calendar.DATE) + 2 - today; // 星期一 now.set(Calendar.DATE, first_day_of_week); return now.getTime(); } /** * 获得所在星期的最后一天 */ public static Date getLastDateByWeek(Date date) { Calendar now = Calendar.getInstance(); now.setTime(date); int today = now.get(Calendar.DAY_OF_WEEK); int first_day_of_week = now.get(Calendar.DATE) + 2 - today; // 星期一 int last_day_of_week = first_day_of_week + 6; // 星期日 now.set(Calendar.DATE, last_day_of_week); return now.getTime(); } /** * 获得所在月份的最后一天 * @param 当前月份所在的时间 * @return 月份的最后一天 */ public static Date getLastDateByMonth(Date date) { Calendar now = Calendar.getInstance(); now.setTime(date); now.set(Calendar.MONTH, now.get(Calendar.MONTH) + 1); now.set(Calendar.DATE, 1); now.set(Calendar.DATE, now.get(Calendar.DATE) - 1); now.set(Calendar.HOUR, 11); now.set(Calendar.MINUTE, 59); now.set(Calendar.SECOND, 59); return now.getTime(); } /** * 获得所在月份的第一天 * @param 当前月份所在的时间 * @return 月份的第一天 */ public static Date getFirstDateByMonth(Date date) { Calendar now = Calendar.getInstance(); now.setTime(date); now.set(Calendar.DATE, 0); now.set(Calendar.HOUR, 12); now.set(Calendar.MINUTE, 0); now.set(Calendar.SECOND, 0); return now.getTime(); } }
【文件预览】：
CalendarUtil.java