自定义日期工具类 DateUtil

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;/*** 日期工具类* @author Administrator**/
public class DateUtil {
    /*** 获取当年年月日字符串* @return* @throws Exception*/public static String getCurrentDateStr()throws Exception{
    Date date=new Date();SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");return sdf.format(date);}/*** 把日期字符串格式化成日期对象* @param str* @param format* @return* @throws Exception*/public static Date formatString(String str,String format)throws Exception{
    if(StringUtil.isEmpty(str)){
    return null;}SimpleDateFormat sdf=new SimpleDateFormat(format);return sdf.parse(str);}/*** 把日期对象格式化成字符串* @param date* @param format* @return* @throws Exception*/public static String formatDate(Date date,String format)throws Exception{
    String result="";SimpleDateFormat sdf=new SimpleDateFormat(format);if(date!=null){
    result=sdf.format(date);}return result;}/*** 获取指定范围内的日期集合* @param begin* @param end* @return* @throws Exception*/public static List<String> getRangeDates(String begin,String end)throws Exception{
    List<String> datas=new ArrayList<String>();Calendar cb=Calendar.getInstance();Calendar ce=Calendar.getInstance();cb.setTime(formatString(begin,"yyyy-MM-dd"));ce.setTime(formatString(end,"yyyy-MM-dd"));datas.add(begin);while(cb.before(ce)){
    cb.add(Calendar.DAY_OF_MONTH, 1);datas.add(formatDate(cb.getTime(),"yyyy-MM-dd"));}return datas;}/*public static void main(String[] args) throws Exception {List<String> dates=getRangeDates("2017-10-28","2017-12-03");for(String date:dates){System.out.println(date);}}*//*** 获取指定范围内的月份集合* @param begin* @param end* @return* @throws Exception*/public static List<String> getRangeMonths(String begin,String end)throws Exception{
    List<String> months=new ArrayList<String>();Calendar cb=Calendar.getInstance();Calendar ce=Calendar.getInstance();cb.setTime(formatString(begin,"yyyy-MM"));ce.setTime(formatString(end,"yyyy-MM"));months.add(begin);while(cb.before(ce)){
    cb.add(Calendar.MONTH, 1);months.add(formatDate(cb.getTime(),"yyyy-MM"));}return months;}public static void main(String[] args) throws Exception {
    List<String> dates=getRangeMonths("2016-10","2017-12");for(String date:dates){
    System.out.println(date);}}
}