基于ssm+mysql实现的图书在线管理系统源码.zip

package com.zhang.util; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; import java.util.List; import org.apache.commons.lang.time.DurationFormatUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * 日期工具类 * getMonthSpace * @author chj DateUtil.java 2013-12-11 */ public class DateUtils { private static Logger log = LoggerFactory.getLogger(DateUtils.class); public static String DEFAULT_FORMAT = "yyyy-MM-dd"; public static String FORMAT_STR1 = "yyyy.MM.dd"; private static String timePattern = "HH:mm"; public static String timePattern2 = "yyyyMMddHHmmss"; public static String dateTimePattern = "yyyy-MM-dd HH:mm:ss"; /** * 根据日期格式，返回日期按DEFAULT_FORMAT格式转换后的字符串 * * @param aDate * 日期对象 * @return 格式化后的日期的页面显示字符串 */ public static final String getDate(Date aDate) { SimpleDateFormat df = null; String returnValue = ""; if (aDate != null) { df = new SimpleDateFormat(DEFAULT_FORMAT); returnValue = df.format(aDate); } return (returnValue); } public static final String parseToDateTimeStr(Date aDate) { SimpleDateFormat df = null; String returnValue = ""; if (aDate != null) { df = new SimpleDateFormat(dateTimePattern); returnValue = df.format(aDate); } return (returnValue); } /** * 计算两个日期之间相差的天数 * * @param smdate * 较小的时间 * @param bdate * 较大的时间 * @return 相差天数 * @throws ParseException */ public static int daysBetween(Date smdate, Date bdate){ try { SimpleDateFormat sdf = new SimpleDateFormat(DEFAULT_FORMAT); smdate = sdf.parse(sdf.format(smdate)); bdate = sdf.parse(sdf.format(bdate)); Calendar cal = Calendar.getInstance(); cal.setTime(smdate); long time1 = cal.getTimeInMillis(); // smdate cal.setTime(bdate); long time2 = cal.getTimeInMillis(); // bdate long between_days = (time2 - time1) / (1000 * 3600 * 24); return Integer.parseInt(String.valueOf(between_days)); } catch (ParseException e) { throw new RuntimeException("daysBetween error"+smdate+";"+bdate,e); } } /** * 计算两个日期之间相差的月数 * * @param smdate * 较小的时间 * @param bdate * 较大的时间 * @return 相差月数 * @throws ParseException */ public static int getMonthSpace(Date smdate, Date bdate) throws ParseException { return Integer.parseInt(DurationFormatUtils.formatPeriod(smdate.getTime(), bdate.getTime(), "M")); } public static int getMonth(Date smdate, Date bdate) throws ParseException { int result = 0; Calendar c1 = Calendar.getInstance(); Calendar c2 = Calendar.getInstance(); c1.setTime(smdate); c2.setTime(bdate); result = c2.get(Calendar.DAY_OF_MONTH) - c1.get(Calendar.DAY_OF_MONTH); return result == 0 ? 1 : Math.abs(result); } /** * 按照日期格式，将字符串解析为日期对象 * * @param aMask * 输入字符串的格式 * @param strDate * 一个按aMask格式排列的日期的字符串描述 * @return Date 对象 * @see java.text.SimpleDateFormat * @throws ParseException */ public static final Date convertStringToDate(String aMask, String strDate) throws ParseException { SimpleDateFormat df = null; Date date = null; df = new SimpleDateFormat(aMask); if (log.isDebugEnabled()) { log.debug("converting '" + strDate + "' to date with mask '" + aMask + "'"); } try { date = df.parse(strDate); } catch (ParseException pe) { // log.error("ParseException: " + pe); throw new ParseException(pe.getMessage(), pe.getErrorOffset()); } return (date); } /** * This method returns the current date time in the format: yyyy/MM/dd HH:MM * a * * @param theTime * the current time * @return the current date/time */ public static String getTimeNow(Date theTime) { return getDateTime(timePattern, theTime); } /** * This method returns the current date in the format: yyyy-MM-dd * * @return the current date * @throws ParseException */ public static Calendar getToday() throws ParseException { Date today = new Date(); SimpleDateFormat df = new SimpleDateFormat(DEFAULT_FORMAT); // This seems like quite a hack (date -> string -> date), // but it works ;-) String todayAsString = df.format(today); Calendar cal = new GregorianCalendar(); cal.setTime(convertStringToDate(todayAsString)); return cal; } /** * This method generates a string representation of a date's date/time in * the format you specify on input * * @param aMask * the date pattern the string is in * @param aDate * a date object * @return a formatted string representation of the date * * @see java.text.SimpleDateFormat */ public static final String getDateTime(String aMask, Date aDate) { SimpleDateFormat df = null; String returnValue = ""; if (aDate == null) { log.error("aDate is null!"); } else { df = new SimpleDateFormat(aMask); returnValue = df.format(aDate); } return (returnValue); } /** * 根据日期格式，返回日期按DEFAULT_FORMAT格式转换后的字符串 * * @param aDate * @return */ public static final String convertDateToString(Date aDate) { return getDateTime(DEFAULT_FORMAT, aDate); } /** * 按照日期格式，将字符串解析为日期对象 * * @param strDate * (格式 yyyy-MM-dd) * @return * * @throws ParseException */ public static Date convertStringToDate(String strDate) throws ParseException { Date aDate = null; try { if (log.isDebugEnabled()) { log.debug("converting date with pattern: " + DEFAULT_FORMAT); } aDate = convertStringToDate(DEFAULT_FORMAT, strDate); } catch (ParseException pe) { log.error("Could not convert '" + strDate + "' to a date, throwing exception"); throw new ParseException(pe.getMessage(), pe.getErrorOffset()); } return aDate; } /** * 时间相加 * * @param date * @param day * @return */ public static Date addDay(Date date, int day) { GregorianCalendar calendar = new GregorianCalendar(); calendar.setTime(date); calendar.add(Calendar.DAY_OF_YEAR, day); return calendar.getTime(); } public static Date addHour(Date date, int hour) { GregorianCalendar calendar = new GregorianCalendar(); calendar.setTime(date); calendar.add(Calendar.HOUR, hour); return calendar.getTime(); } /** * 月相加 * * @param date * @param month * @return */ public static Date addMonth(Date date, int month) { GregorianCalendar calendar = new GregorianCalendar(); calendar.setTime(date); calendar.add(Calendar.MONTH, month); return calendar.getTime(); } public static int getDay(Date d) { Calendar calendar = Calendar.getInstance(); calendar.setTime(d); return calendar.get(Calendar.DATE); } /** * 格式化日期 * * @param date * 日期对象 * @return String 日期字符串 */ /** * 本年的第一天 */ public static String getYearFirst(Integer year) { return formatDate(getCurrYearFirst(year)); } /** * 本年的最后一天 * * @author cjx 2013-2-25 DateUtil String * @param year * @return * * getYearLast */ public static String getYearLast(Integer year) { return formatDate(getCurrYearLast(year)); } public static Integer getYear() { Date date = new Date(); SimpleDateFormat f = new SimpleDateFormat("yyyy"); String year = f.format(date); return Integer.valueOf(year); } /** * * return yyyy-MM-dd * * @param date * @return */ public static String formatDate(Date date) { SimpleDateFormat f = new SimpleDateFormat(DEFAULT_