DateFormatUtil-优快云博客

本文介绍了一个实用的日期格式转换工具类，提供了多种方法用于字符串与日期格式之间的相互转换，包括不同日期格式的支持，并展示了如何获取一天开始和结束的时间点。

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public class DateFormatUtil { /** * 字符串转为日期格式 * @param dateString * @return * @throws ParseException */ public static Date stringFormatDate(String dateString) throws ParseException{ SimpleDateFormat bartDateFormat = new SimpleDateFormat("yyyy-MM-dd"); Date date = bartDateFormat.parse(dateString); return date; } /** * 字符串转为日期格式 * @param dateString * @return * @throws ParseException */ public static Date stringFormatDateTime(String dateString) throws ParseException{ SimpleDateFormat bartDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date date = bartDateFormat.parse(dateString); return date; } /** * 字符串转为日期格式 * @param dateString * @return * @throws ParseException */ public static Date stringFormatDateTime2(String dateString) throws ParseException{ SimpleDateFormat bartDateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); Date date = bartDateFormat.parse(dateString); return date; } /** * 将时间格式化为含时分秒的字符串 * @param date * @return * @throws ParseException */ public static String dateTimeFormatString(Date date) throws ParseException{ SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); return dateFormat.format(date); } /** * 将时间格式化为不含时分秒的字符串 * @param date * @return * @throws ParseException */ public static String dateFormatString(Date date) throws ParseException{ SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); return dateFormat.format(date); } public final static Date[] strToDateArray(String dateStr) { java.sql.Date date_temp = java.sql.Date.valueOf(dateStr); Calendar calendar = Calendar.getInstance(); calendar.setTime(date_temp); calendar.add(Calendar.HOUR_OF_DAY, 0); calendar.add(Calendar.MINUTE, 0); calendar.add(Calendar.SECOND, 0); java.util.Date beginDate = calendar.getTime(); calendar.add(Calendar.HOUR_OF_DAY, 23); calendar.add(Calendar.MINUTE, 59); calendar.add(Calendar.SECOND, 59); java.util.Date endDate = calendar.getTime(); return new Date[]{beginDate, endDate}; } /** * 通过实践搜索,字符串转日期 * @param beginDateStr * 开始时间 * @param endDateStr * 结束时间 * @return */ public static Date[] strToDateArray(String beginDateStr,String endDateStr){ try { if ("".equals(endDateStr) || endDateStr.length()==0) { endDateStr = beginDateStr; } Date beginDate = stringFormatDate(beginDateStr); Date endDate = stringFormatDate(endDateStr); Calendar calendar = Calendar.getInstance(); calendar.setTime(beginDate); calendar.set(Calendar.HOUR_OF_DAY, 0); calendar.set(Calendar.MINUTE, 0); calendar.set(Calendar.SECOND, 0); beginDate = calendar.getTime(); calendar.setTime(endDate); calendar.set(Calendar.HOUR_OF_DAY, calendar.getMaximum(Calendar.HOUR_OF_DAY)); calendar.set(Calendar.MINUTE, 59); calendar.set(Calendar.SECOND, 59); endDate = calendar.getTime(); return new Date[]{beginDate,endDate}; } catch (Exception e) { throw new RuntimeException("时间格式化错误"); } } public static Date getTheDayOfEndTime(String dateString ) throws ParseException { Date date = null; if(dateString.contains(" ")){ date = stringFormatDateTime(dateString); }else{ date = stringFormatDate(dateString); } return getTheDayOfEndTime(date); } public static Date getTheDayOfEndTime(Date date) throws ParseException { Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.set(Calendar.HOUR_OF_DAY, 23); cal.set(Calendar.MINUTE, 59); cal.set(Calendar.SECOND, 59); return cal.getTime(); } public static Date getTheDayOfStartTime(String dateString ) throws ParseException { Date date = null; if(dateString.contains(" ")){ date = stringFormatDateTime(dateString); }else{ date = stringFormatDate(dateString); } return getTheDayOfStartTime(date); } public static Date getTheDayOfStartTime(Date date) throws ParseException{ Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.set(Calendar.HOUR_OF_DAY, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); return cal.getTime(); } }