javaweb开发中常用的时间工具类

package com.bx.util.commonUtil;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.List;/** * 时间日期的工具类 * @author Administrator * */public class Date_util {/** * 获取给定匹配格式的format对象 * @param pattern * @return * @throws Exception */public static SimpleDateFormat getFormat(String pattern) throws Exception{ return new SimpleDateFormat(pattern);}/** * 按给定格式格式化给定日期，返回格式化日期字符串 * @param format * @param date * @return */public static String getFormatDateStr(SimpleDateFormat format,Date date){return format.format(date);}/** * 根据传入字段做对应的加减 * @param date * @param amount * @param field：year、month、date、hour、minute、second *  * @return */public static Date addByField(Date date,int amount,int field){Calendar calendar = GregorianCalendar.getInstance();calendar.setTime(date);calendar.add(field, amount);return calendar.getTime();}/** * 获取传入格式的当前时间 * @param pattern * @return * @throws Exception  */public static String getFormatCurrentTime(String pattern) throws Exception{SimpleDateFormat format = getFormat(pattern);return format.format(new Date());}/** * 获取格式化的前一天的日期 * @param pattern * @return * @throws Exception */public static String getFormatYesterday(String pattern) throws Exception{SimpleDateFormat format = getFormat(pattern);return format.format(addByField(new Date(), -1, Calendar.DATE));}/** * 获取指定格式化的明天的时间 * @param pattern * @return * @throws Exception */public static String getFormatTomorrow(String pattern) throws Exception{SimpleDateFormat format = getFormat(pattern);return format.format(addByField(new Date(), 1, Calendar.DATE));}/** * 获得给定日期所在周的周一的时间，返回格式化日期字符串 * @param date * @param pattern * @return * @throws Exception */public static String getFirstDayOfWeek(Date date,String pattern) throws Exception{Calendar calendar = GregorianCalendar.getInstance();calendar.setFirstDayOfWeek(Calendar.MONDAY);//按国内的习惯指定一周的第一天为周一calendar.setTime(date);calendar.set(Calendar.DAY_OF_WEEK, calendar.getFirstDayOfWeek());return getFormat(pattern).format(calendar.getTime());}/** * 获得给定日期所在周的周日时间，返回格式化字符串 * @param date * @param pattern * @return * @throws Exception */public static String getLastDayOfWeek(Date date,String pattern) throws Exception{Calendar calendar = GregorianCalendar.getInstance();calendar.setFirstDayOfWeek(Calendar.MONDAY);//按国内的习惯指定一周的第一天为周一calendar.setTime(date);calendar.set(Calendar.DAY_OF_WEEK, calendar.getFirstDayOfWeek()+6);return getFormat(pattern).format(calendar.getTime());}/** * 获得指定日期所在月的第一天日期，返回格式化字符串 * @param date * @param pattern * @return * @throws Exception */public static String getFirstDayofMonth(Date date,String pattern) throws Exception{Calendar calendar = GregorianCalendar.getInstance();calendar.setTime(date);calendar.set(Calendar.DAY_OF_MONTH, 1);return getFormat(pattern).format(calendar.getTime());}/** * 获得指定日期所在月最后一天的日期，返回格式化字符串, * 此方法利用日历类的封装可以免去对某一个月具体天数的讨论 * @param date * @param pattern * @return * @throws Exception */public static String getLastDayofMonth(Date date,String pattern)throws Exception{Calendar calendar = new GregorianCalendar();calendar.setTime(date);calendar.set(Calendar.DAY_OF_MONTH, 1);calendar.add(Calendar.MONTH, 1);calendar.add(Calendar.DAY_OF_MONTH, -1);return getFormat(pattern).format(calendar.getTime());}/** * 获取给定时间段内每一天的格式化日期列表 * @param startDate * @param endDate * @param pattern * @return * @throws Exception */public static List<String> getDateList(Date startDate,Date endDate,String pattern) throws Exception{List<String> list = new ArrayList<String>();SimpleDateFormat format = getFormat(pattern);Calendar calendar = new GregorianCalendar();calendar.setTime(startDate);while(startDate.compareTo(endDate)<0){list.add(format.format(calendar.getTime()));calendar.add(Calendar.DAY_OF_MONTH, 1);startDate = calendar.getTime(); }return list;}/** *返回两个日期之间的天数(注意该方法传入的参数如果精确到时分秒的话，会以24小时为一天进行计算，可能出现预期之外的结果) * @param startDate * @param endDate * @return * @throws Exception */public static int daysOfTwoDate(Date startDate,Date endDate) throws Exception{if(startDate == null || endDate == null){return -1;}long startTime = startDate.getTime();long endTime = endDate.getTime();return (int)((endTime - startTime)/(24*60*60*1000));}/** * 返回两个日期之间的天数的另一个方法（推荐使用） * @param startDate * @param endDate * @return * @throws Exception */public static int daysOfTwoCal(Date startDate,Date endDate) throws Exception{Calendar cal = GregorianCalendar.getInstance();cal.setTime(startDate);int startDayOfYear = cal.get(Calendar.DAY_OF_YEAR);cal.setTime(endDate);int endDayOfYear = cal.get(Calendar.DAY_OF_YEAR);return endDayOfYear-startDayOfYear;}}