虽然java8的LocalDate已经出来,但是很多项目以及自己习惯上还是使用Date,这里还是简单介绍一下如何通过java.util.Calendar获取时间区间.
1 通过calendar.getActualMinimum,getActualMaximum获取周,月,年的最大值,最小值
1 /** 2 * @Title: getSeasonFrist 3 * @Description: 获取季度初日期 4 * @param calendar 5 * @return 6 * @throws ParseException 7 */ 8 public static String getSeasonFrist(Calendar calendar) throws ParseException { 9 int month = calendar.get(Calendar.MONTH);10 int season = getSeason(month, 0);11 calendar.set(Calendar.DAY_OF_MONTH, 0);12 calendar.set(Calendar.MONTH, season);13 calendar.add(Calendar.DATE, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));14 return sdf.format(calendar.getTime());15 }16 17 /**18 * @Title: getSeasonLast19 * @Description: 获取季度末日期时间20 * @param calendar21 * @return22 * @throws ParseException23 */24 public static String getSeasonLast(Calendar calendar) throws ParseException {25 int month = calendar.get(Calendar.MONTH);26 int season = getSeason(month, 1);27 calendar.set(Calendar.MONTH, season);28 calendar.set(Calendar.DAY_OF_MONTH, -1);29 calendar.add(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));30 return sdf.format(calendar.getTime());31 } 问题,因为直接设置月份,除了月份其他信息没有改,会造成获取月份最大值不准确,即当前月是9月,我把月份改成10,但是9月的最大天数是30,所以获取月份最后一天就是:10月30日
方式二:通过获取下月月初减一的方式获取区间最后一天,这种方式可简单有效解决月末日期不准确问题
1 /** 2 * @Title: getSeasonFrist 3 * @Description: 获取季度初日期 4 * @param calendar 5 * @return 6 * @throws ParseException 7 */ 8 public static String getSeasonFrist(Calendar calendar) throws ParseException { 9 int month = calendar.get(Calendar.MONTH);10 int season = getSeason(month, 0);11 calendar.set(Calendar.MONTH, season);12 calendar.set(Calendar.DAY_OF_MONTH, 1);13 return sdf.format(calendar.getTime());14 }15 16 /**17 * @Title: getSeasonLast18 * @Description: 获取季度末日期时间19 * @param calendar20 * @return21 * @throws ParseException22 */23 public static String getSeasonLast(Calendar calendar) throws ParseException {24 int month = calendar.get(Calendar.MONTH);25 int season = getSeason(month, 1);26 calendar.set(Calendar.MONTH, season + 1);27 calendar.set(Calendar.DAY_OF_MONTH, 0);28 return sdf.format(calendar.getTime());29 } 这里用季度的例子举例,月和年类似;因为calendar没有直接获取季度的方法,季度的区间需要自己定义,其实就是获取当前月,然后自己定义每个月属于哪个季度,并返回季度首尾的月份;
