/**

* 方法一

*/

String strDate = "2012-02";

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM");

Date date = format.parse(strDate);

Calendar calendar = new GregorianCalendar();

calendar.setTime(date);

int days1 = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);

System.out.println("天数为=" + days1);

/**

* 方法二

*/

int days2 = new Date(2012,02,0).getDate();

System.out.println("天数为=" + days2);