import java.util.Calendar; import java.util.Date; import java.util.TimeZone;public class DateUtil {/*根據年份和星期的序號，獲取該星期從哪一天到哪一天*/public static String getWeekGap(int year, int weekNum) {Calendar c = Calendar.getInstance();c.set(year, 0, 01); // 月份是從零開始int weekDay = c.get(Calendar.DAY_OF_WEEK) == 1 ? 8 : c.get(Calendar.DAY_OF_WEEK);c.add(Calendar.DATE, 7 * weekNum);c.add(Calendar.DATE, Calendar.MONDAY - weekDay);Date start = c.getTime();c.add(Calendar.DATE, 6);Date end = c.getTime();String datestr = String.format("%1$tY-%1$tm-%1$td", start) + "至"+ String.format("%1$tY-%1$tm-%1$td", end);return datestr;}/*獲取當前星期從哪一天到哪一天*/public static String getWeekGap_Default() {Calendar c = Calendar.getInstance();c.getTime();int weekDay = c.get(Calendar.DAY_OF_WEEK) == 1 ? 8 : c.get(Calendar.DAY_OF_WEEK);c.add(Calendar.DATE, Calendar.MONDAY - weekDay);Date start = c.getTime();c.add(Calendar.DATE, 6);Date end = c.getTime();String datestr = String.format("%1$tY-%1$tm-%1$td", start) + "至"+ String.format("%1$tY-%1$tm-%1$td", end);return datestr;}/*獲取當前星期是一年中第幾個星期*/public static int getWeekNumOfYear(){TimeZone zone=TimeZone.getTimeZone("Asia/Shanghai");Calendar cal = Calendar.getInstance(zone);int c = cal.get(Calendar.WEEK_OF_YEAR);System.out.println(c);return c-1;}public static int getYear(){Calendar ca = Calendar.getInstance();ca.setTime(new java.util.Date());return ca.get(Calendar.YEAR);}}

轉載于:https://www.cnblogs.com/ihou/archive/2011/08/25/2153712.html

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