java日期的处理

SimpleDateFormat sdf ?= ? new ?SimpleDateFormat( "yyyy-MM-dd" ); ?

Date date=sdf.parse(user.getYxrq());

Calendar yxrq=Calendar.getInstance();

yxrq.setTime(date);//指定calendar的时间

Calendar now=Calendar.getInstance();

yxrq.compareTo(now) ?相当于-->yqrx-now

if(yxrq.compareTo(now)<=0){

//账号过期

writer.print("-3");

return null;

}

//计算两个时间的差

long cha=(yxrq.getTimeInMillis()-now.getTimeInMillis()) / (1000 * 60 * 60 * 24);