计算出给定日期所在周的周一和周日

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计算出给定日期所在周的周一和周日
 
结果类：
import java.util.Date;public class Week {private Date date;//日期private Date start;//date所在周的第一天（星期一）private Date end;//date所在周的最后一天（星期日）public Week(Date date){this.date = date;}public Date getDate() {return date;}public void setDate(Date date) {this.date = date;}public Date getStart() {return start;}public void setStart(Date start) {this.start = start;}public Date getEnd() {return end;}public void setEnd(Date end) {this.end = end;}} 
工具方法：
import org.apache.commons.lang.time.DateUtils;/** * 计算出给定日期所在周的周一和周日 *  * @param date * @return * @throws ParseException */public static Week getWeekByDate(Date date) throws ParseException {Date _date = DateUtils.truncate(date, Calendar.DAY_OF_MONTH);Calendar c = Calendar.getInstance();c.setTime(_date);// 星期：1，2，3，4，5，6，7int iWeek = c.get(Calendar.DAY_OF_WEEK);//时期日->星期八if(iWeek == 1){iWeek = 8;}Week week = new Week(_date);// 算出离星期一（2）的距离week.setStart(DateUtils.addDays(_date, 2 - iWeek));// 算出离星期日（8）的距离week.setEnd(DateUtils.addDays(_date, 8 - iWeek));return week;} 
测试代码：
public static void main(String[] args) throws Exception {SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss SSS");Date date = DateUtils.parseDate("2011-05-11", new String[] { "yyyy-MM-dd" });System.out.println("------" + df.format(date) + "------");Week week = getWeekByDate(date);System.out.println(df.format(week.getStart()));System.out.println(df.format(week.getEnd()));date = DateUtils.parseDate("2011-05-09", new String[] { "yyyy-MM-dd" });System.out.println("------" + df.format(date) + "------");week = getWeekByDate(date);System.out.println(df.format(week.getStart()));System.out.println(df.format(week.getEnd()));date = DateUtils.parseDate("2011-05-15", new String[] { "yyyy-MM-dd" });System.out.println("------" + df.format(date) + "------");week = getWeekByDate(date);System.out.println(df.format(week.getStart()));System.out.println(df.format(week.getEnd()));} 测试结果：
------2011-05-11 00:00:00 000------2011-05-09 00:00:00 0002011-05-15 00:00:00 000------2011-05-09 00:00:00 000------2011-05-09 00:00:00 0002011-05-15 00:00:00 000------2011-05-15 00:00:00 000------2011-05-09 00:00:00 0002011-05-15 00:00:00 000