/**
	 * 销售榜单
	 * @param year
	 * @param month
	 * @param response
	 * @throws IOException
	 */
	@RequestMapping("/download.do")
	public void downloadProduct(String year,String month,
			HttpServletResponse response,HttpServletRequest request) throws IOException {
		//根据年份、月份查询出销售榜单
		List<Dow> result = null;
		if(year != "" && month != "") {
			String time = year + "-" + month;
			 result = adminService.selectProductByTime(time);	
		}
		if(year == "") {
			result = adminService.selectProductByTime(month);
		}
		if(month == "") {
			result = adminService.selectProductByTime(year);
		}
		System.out.println(result.size());
		//定义文件名
		String fileName = year + "年" + month + "月销售榜单.xls";
		if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0) {  
			fileName = URLEncoder.encode(fileName, "UTF-8");  
		} else {  
			fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");  
		} 
		//定义表名
		String sheetName = month + "月销售榜单";
		//定义表标题
		String titleName = year + "年" + month + "月销售榜单";
		//定义列名，即表头
		String[] columnName = {"商品名称","销售数量"};
		//创建二维数组，向其中写数据
		int columnNum = 2;
		String[][] dataList = new String[result.size()][columnNum];
		for (int i = 0; i < result.size(); i++) {
			Dow dow = result.get(i);
			dataList[i][0] = dow.getName();
			dataList[i][1] = dow.getSum();
		}
		//创建HSSFWorkbook对象，其对应一个Excel文件
		HSSFWorkbook wb = new HSSFWorkbook();
		//在wb中创建一个表sheet
		HSSFSheet sheet = wb.createSheet(sheetName);
		//在表中创建第一行
		HSSFRow row1 = sheet.createRow(0);
		//在表中创建第一个单元格
		HSSFCell cell1 = row1.createCell(0);
		//合并单元格
		sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 1));
		//向第一个单元格中写数据
		cell1.setCellValue(titleName);
		//创建第二行，并写数据
		HSSFRow row = sheet.createRow(1);
		for (int i = 0; i < columnNum; i++) {
			HSSFCell cell = row.createCell(i);
			cell.setCellValue(columnName[i]);
			System.out.println(columnName[i]);
		}
		//创建数据行，并写入数据
		for (int i = 0; i < dataList.length; i++) {
			HSSFRow row3 = sheet.createRow(i+2);
			for (int j = 0; j < columnNum; j++) {
				row3.createCell(j).setCellValue(dataList[i][j]);
			}
		}
		//设置响应头
		response.setContentType("application/ms-excel;charset=utf-8");
		response.setHeader("content-Disposition", "attachment;filename="+fileName);
		//向流中写入文件
		ServletOutputStream out = response.getOutputStream();
		wb.write(out);
		//更新缓冲区
		out.flush();
		//关闭流
		out.close();
	}