JAVA笔记

获取上年年末日期：

Date date = new Date();
Calendar oldCalendar = Calendar.getInstance();
oldCalendar.setTime(date);
oldCalendar.add(Calendar.YEAR, -1);//拨回去年
oldCalendar.set(Calendar.DAY_OF_YEAR,oldCalendar.getActualMaximum(Calendar.DAY_OF_YEAR));

获取月末日期

SimpleDateFormat sdf1=new SimpleDateFormat("yyyyMMdd");
SimpleDateFormat sdf2=new SimpleDateFormat("yyyy-MM-dd");
Calendar calStart=Calendar.getInstance();
Calendar calEnd=Calendar.getInstance();
if(!StringUtils.isEmpty(qp.getParam("startTime"))){//有查询月份
	SimpleDateFormat s1=new SimpleDateFormat("yyyy-MM");
	String startTime=(String)qp.getParam("startTime");
	Date date=null;
	try {
		date=s1.parse(startTime);
		calStart.setTime(date);
		calEnd.setTime(date);
		calStart.set(Calendar.DAY_OF_MONTH, 1);
		calEnd.add(Calendar.MONTH,1);
		calEnd.set(Calendar.DAY_OF_MONTH, 0);
	} catch (ParseException e) {
		e.printStackTrace();
	}
}else{
	Date date=new Date();
	calStart.setTime(date);
	calEnd.setTime(date);
	calStart.set(Calendar.DAY_OF_MONTH, 1);
	calEnd.add(Calendar.MONTH,1);
	calEnd.set(Calendar.DAY_OF_MONTH, 0);
}