生成日期+随机数的编号

package zhiguolian;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.commons.lang3.RandomStringUtils;

public class hah {
    public static void main(String[] args) {
         SimpleDateFormat format = new SimpleDateFormat("yyMMddhhmmss");
         String uid_pfix = format.format(new Date()); 
         
         String random = RandomStringUtils.randomNumeric(4).toString();
         System.out.println(uid_pfix+random);
    }
}