java时间处理工具类总结二

package org.util.date;import java.text.ParseException;import java.text.SimpleDateFormat;import org.apache.commons.logging.LogFactory;import java.util.GregorianCalendar;import org.apache.commons.logging.Log;import java.util.Date;import java.util.Calendar;/*** <p>Title: </p>** <p>Description: </p>** <p>Copyright: Copyright (c) 2007</p>** <p>Company: </p>** @author not attributable* @version 1.0*/public class DateUtil{ private static Log log = LogFactory.getLog(DateUtil.class); private static String datePattern = "yyyy-MM-dd"; private static String timePattern = "HH:mm"; /** * Return 缺省的日期格式 (yyyy/MM/dd) * * @return 在页面中显示的日期格式 */ public static String getDatePattern() { return datePattern; } /** * 根据日期格式，返回日期按datePattern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(datePattern); returnValue = df.format(aDate); } return (returnValue); } public static final String getDate(String pattern) { Date date = new Date(); return getDate(date, pattern); } public static final String getDate(Date date, String pattern) { SimpleDateFormat df = null; String returnValue = ""; if (date != null) { df = new SimpleDateFormat(pattern); returnValue = df.format(date); } return (returnValue); } public static Date getDate(String dateString, String pattern) { SimpleDateFormat df = null; Date date = new Date(); if (dateString != null) { try { df = new SimpleDateFormat(pattern); date = df.parse(dateString); } catch(Exception e) {} } return date; } /** * 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) { 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) {} 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(datePattern); // 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datePattern格式转换后的字符串 * @param aDate Date * @return String */ public static final String convertDateToString(Date aDate) { return getDateTime(datePattern, aDate); } /** * 按照日期格式，将字符串解析为日期对象 * @param strDate String * @return Date * @throws ParseException */ public static Date convertStringToDate(String strDate) { Date aDate = null; if (log.isDebugEnabled()) { log.debug("converting date with pattern: " + datePattern); } aDate = convertStringToDate(datePattern, strDate); return aDate; } public static String getYear() { Date date = new Date(); return getDate(date, "yyyy"); } public static String getMonth() { Date date = new Date(); return getDate(date, "MM"); } public static String getDay() { Date date = new Date(); return getDate(date, "dd"); } /** * 返回小时 * * @param date * 日期 * @return 返回小时 */ public static int getHour(java.util.Date date) { java.util.Calendar c = java.util.Calendar.getInstance(); c.setTime(date); return c.get(java.util.Calendar.HOUR_OF_DAY); } /** * 返回分钟 * * @param date * 日期 * @return 返回分钟 */ public static int getMinute(java.util.Date date) { java.util.Calendar c = java.util.Calendar.getInstance(); c.setTime(date); return c.get(java.util.Calendar.MINUTE); } /** * 返回秒钟 * * @param date * 日期 * @return 返回秒钟 */ public static int getSecond(java.util.Date date) { java.util.Calendar c = java.util.Calendar.getInstance(); c.setTime(date); return c.get(java.util.Calendar.SECOND); } /** * 返回毫秒 * * @param date * 日期 * @return 返回毫秒 */ public static long getMillis(java.util.Date date) { java.util.Calendar c = java.util.Calendar.getInstance(); c.setTime(date); return c.getTimeInMillis(); } /** * 日期相加 * * @param date * 日期 * @param day * 天数 * @return 返回相加后的日期 */ public static java.util.Date addDate(java.util.Date date, int day) { java.util.Calendar c = java.util.Calendar.getInstance(); c.setTimeInMillis(getMillis(date) + ((long) day) * 24 * 3600 * 1000); return c.getTime(); } /** * 日期相减 * * @param date * 日期 * @param date1 * 日期 * @return 返回相减后的日期 */ public static int diffDate(java.util.Date date, java.util.Date date1) { return (int) ((getMillis(date) - getMillis(date1)) / (24 * 3600 * 1000)); } public static int diffDateToHour(Date date, Date date1) { return (int) ((getMillis(date) - getMillis(date1)) / (1000 * 60* 60)); }}