Calendar cal=Calendar.getInstance();
//得到当前的年份或月份
int month=cal.get(Calendar.MONTH)+1;
int month=cal.get(Calendar.YEAR);
//得到昨天日期
cal.add(Calendar.DATE,-1);
String yesterday = new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());
Calendar cal=Calendar.getInstance();
//得到当前的年份或月份
int month=cal.get(Calendar.MONTH)+1;
int month=cal.get(Calendar.YEAR);
//得到昨天日期
cal.add(Calendar.DATE,-1);
String yesterday = new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());