写了如下工具类:
- public class SystemUtil {
- public static String getRandomNumberByNum(int num) {
- StringBuffer sb = new StringBuffer();
- for (int i = 0; i < num; i++) {
- long randomNum = Math.round(Math.floor(Math.random() * 10.0D));
- sb.append(randomNum);
- }
- return sb.toString();
- }
- }
- public class Producer {
- public static String generateIdOfTen() {
- String randomNumber = SystemUtil.getRandomNumberByNum(10);
- long time = System.currentTimeMillis();
- return time + randomNumber;
- }
- }
来源: http://www.phpxs.com/code/1002310/