生成随机数的工具类（短信验证码）

/*生成count位数的随机数字*/
import java.util.Random;

public class randomUtil {

    public static String getRandomCode(int count){
        StringBuffer s = new StringBuffer();
        for (int i = 0; i < count; i++) {
             String code = String.valueOf(new Random().nextInt(10));
             s.append(code);

        }
        return s.toString();
    }
}