String date = "2011-10-21";
int y = Integer.parseInt(date.substring(0, 4));
int m = Integer.parseInt(date.substring(5, 7));
int d = Integer.parseInt(date.substring(8, 10));
int day = 0;
day = Integer.parseInt(string.substring(string.length()-2));
后面那个2是日的位数,1号要输01,21号输21