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public class DateUtils { /** * 获取当前时间的毫秒数 * 参数格式：yyyy-MM-dd HH:mm:ss * @param time * @return * @throws ParseException */ public static long getTimeInMillis(String time) throws ParseException { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Calendar cal = Calendar.getInstance(); cal.setTime(sdf.parse(time)); long timeInMillis = cal.getTimeInMillis(); return timeInMillis;} /** * 获取当前日期格式： yyyy-mm-dd HH:mm:ss */ public static String getDate() { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); return sdf.format(new Date());} /** * 获取当前日期格式： yyyy-mm-dd */ public static String getDate1() { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); return sdf.format(new Date());} /** * 获取当前时间格式： HH:mm:ss */ public static String getTime() { SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss"); return sdf.format(new Date());} /** * 获取当前时间格式： yyyyMMddHHmmss */ public static String getTime2() { SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); return sdf.format(new Date());} /** * 获取当前星期几 */ public static String getWeek() { Calendar c = Calendar.getInstance(); int mWay = c.get(Calendar.DAY_OF_WEEK); if (mWay == 1) return "星期天"; else if (mWay == 2) return "星期一"; else if (mWay == 3) return "星期二"; else if (mWay == 4) return "星期三"; else if (mWay == 5) return "星期四"; else if (mWay == 6) return "星期五"; else return "星期六";} /** * 计算两个日期之间的相差天数 * * @param smdate 较小的时间 * @param bdate 较大的时间 * @return 天数差 * @throws ParseException */ public static int daysBetween(Date smdate, Date bdate) throws ParseException { SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd"); smdate = sdf.parse(sdf.format(smdate)); bdate = sdf.parse(sdf.format(bdate)); Calendar cal = Calendar.getInstance(); cal.setTime(smdate); long time1 = cal.getTimeInMillis(); cal.setTime(bdate); long time2 = cal.getTimeInMillis(); long between_days = (time2 - time1) / (1000 * 3600 * 24); return (int) between_days;} /** * 计算两个时间之间的天数 *@param smdate 较小的时间字符串 * @param bdate 较大的时间字符串 * @return 天数差 * @throws ParseException */ public static int daysBetweenString(String smdate, String bdate) throws ParseException { SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd"); Calendar cal = Calendar.getInstance(); cal.setTime(sdf.parse(smdate)); long time1 = cal.getTimeInMillis(); cal.setTime(sdf.parse(bdate)); long time2 = cal.getTimeInMillis(); long between_days = (time2 - time1) / (1000 * 3600 * 24); return (int) between_days;} /** * 判断当前时间是否在给定时间段内 * @param currentTime 当前时间字符串 * @param beginTime 开始时间字符串 * @param endTime 结束时间字符串 * @return boolean */ public static boolean isCurrentTimeBetween(String currentTime, String beginTime, String endTime) throws ParseException { SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); Calendar cal = Calendar.getInstance(); cal.setTime(sdf.parse(currentTime)); long currentTimeMillis = cal.getTimeInMillis(); cal.setTime(sdf.parse(beginTime)); long beginTimeMillis = cal.getTimeInMillis(); cal.setTime(sdf.parse(endTime)); long endTimeMillis = cal.getTimeInMillis(); return currentTimeMillis > beginTimeMillis && currentTimeMillis < endTimeMillis;} 以上代码经过优化后，内容更加简洁自然，突出了主要功能，同时增加了适当的描述，使页面更易于搜索引擎索引。
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