Date的常用工具类

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package com.cmcc.flow.common.util;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class DateUtil {/** * * @Title:compare_date * @Description: 比较两个日期的先后顺序* @param dt1* @param dt2* @return* 0: dt1== dt2* 1: dt1>dt2* -1: dt1<dt2* 其它值: 比较结果无效* @throws */public static int compare_date(Date dt1,Date dt2){if(dt1==null || dt2==null){return -2;}if (dt1.getTime() > dt2.getTime()) {//dt1 在 dt2后            return 1;        } else if (dt1.getTime() < dt2.getTime()) {//dt1在dt2前            return -1;        } else {            return 0;//dt1=dt2        }}/** *  * @Title: getChineseYMD * @Description: date得到中文的年月日 * @param HttpServletRequest request，Model model * @return String */public static String getChineseYMD(Date date){SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy年MM月dd日");return dateFormat.format(date);}public static Date converStrToDate(String format, String date) throws ParseException {Date dateTemp = null;SimpleDateFormat formater2 = new SimpleDateFormat(format);dateTemp = formater2.parse(date);return dateTemp;}public static Date getBeginMonthOfDate(Date date) throws ParseException{SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");String dateStr = dateFormat.format(date);dateStr += "-01";return converStrToDate("yyyy-MM-dd", dateStr);}/** * 获取当月月初 * @throws ParseException  */public static Date getAfterFewMonths(Date date, int fewMonths) throws ParseException{date = getBeginMonthOfDate(date);Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.add(Calendar.MONTH, fewMonths);return calendar.getTime();}}
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