订单号生成

package com.sims.service.goods.impl;

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

@Service
public class OrderServiceBean extends DaoSupport<Order> implements OrderService{
	
	 * 生成订单号,订单号的组成 两位年+两位月+两位日+两位小时+当天的订单总数 如:11071012100
	 * @param createDate
	 * @return
	 */
	private String buildOrderid(Date createDate) {
		SimpleDateFormat dateFormat = new SimpleDateFormat("yyMMddHH");
		StringBuilder out  = new StringBuilder(dateFormat.format(createDate));
		dateFormat = new SimpleDateFormat("yyyy-MM-dd");
		String strdate = dateFormat.format(createDate);// 2011-07-10
		Date date = createDate;
		try {
			date = dateFormat.parse(strdate);
		} catch (ParseException e) {e.printStackTrace();}
		long count = (Long)em.createQuery("select count(o) from Order o where o.createDate>=?1")
		.setParameter(1, date, TemporalType.TIMESTAMP).getSingleResult();
		out.append(count+1);
		return out.toString();
	}
}