根据日期生成简单的单据号

//单据号生成
	public static String getReceiptId(String type){
		StringBuilder id = new StringBuilder();
		id.append(type);
		Date date = new Date();
		Calendar cale = Calendar.getInstance();
		cale.setTime(date);
		String year = cale.get(Calendar.YEAR)+"";
		id.append(year.substring(2,year.length()));
		String month = (cale.get(Calendar.MONTH) < 9)?"0" + (cale.get(Calendar.MONTH)+1):"" + (cale.get(Calendar.MONTH)+1);
		id.append(month);
		String day = (cale.get(Calendar.DAY_OF_MONTH) < 10)?"0"+cale.get(Calendar.DAY_OF_MONTH):""+cale.get(Calendar.DAY_OF_MONTH);
		id.append(day);
		//查看数据库的单据
		String sql = "select c_batchnoid from (select c_batchnoid from bas_batchno where C_BATCHNOTYPE = '"+type+"' order by D_CREATDATE DESC) where rownum = 1";
		DbConnectionCache db = DbConnectionCache.getInstance();
		Map<String, String> mp = new HashMap<String, String>();
		String upid = DBUtil.SingleValue(db.getConnection(), sql, mp);
		if(upid!=""){
			if((upid.substring(1, 3)).equals(year.substring(2,year.length()))&&upid.substring(3, 5).equals(month)&&upid.substring(5, 7).equals(day)){
				int seq = Integer.parseInt(upid.substring(upid.length() - 3,upid.length()))+1;
				if(Integer.parseInt(upid.substring(upid.length() - 3,upid.length()))!=000){
					seq = Integer.parseInt(upid.substring(upid.length() - 3,upid.length()))+1;
				}else{
					seq = Integer.parseInt(upid.substring(upid.length() - 4,upid.length()))+1;
				}
				if(seq<10){
					id.append("00"+seq);
				}else if(seq<100){
					id.append("0"+seq);
				}else{
					id.append(seq);
				}
			}else{
				id.append("001");
			}
		}else{
			id.append("001");
		}
		return id.toString();
	}