年月日+四位流水号

public class CreateOrderId {
   
    // 获得日期
    public String getTimeStamp() {
        String temp = null;
        SimpleDateFormat sdf = new SimpleDateFormat(“yyyyMMdd”);
        temp = sdf.format(new java.util.Date());
        return temp;
    }
   
    public String getOrderId() {
       
        StringBuffer buf = new StringBuffer();
       
        buf.append(this.getTimeStamp());    // 时间
       
        Random rand = new Random();        
        for (int i=0;i<4;i++) {             // 四位随机数
            buf.append(rad.nextInt(10));
        }
       
        rturn buf.toString();
    }
   
    // 测试
    public static void main(String args[]) {
       
       CreateOrderId createOrderId = new CreateOrderId();
      
       String orderid = createOrderId.getOrderId();
      
       System.out.println(orderid);
    }
}