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);
}
}
}
自定义日期工具类 DateUtil
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转载自blog.csdn.net/qq_37767455/article/details/102637124
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