需求：

基于poi的xls文件下载

实现：

控制层：

@RequestMapping(value = "/exportxls", method = RequestMethod.GET)public void exportxls(HttpServletRequest request, QueryItem queryItem,		HttpServletResponse response) throws Exception {	 	HSSFWorkbook workbook = new HSSFWorkbook();	// 创建工作表对象并命名	Sheet sheet = workbook.createSheet();	/* header start */	Row rowHeader = sheet.createRow(0);	Cell cell1 = rowHeader.createCell(0, Cell.CELL_TYPE_STRING);	cell1.setCellValue("ID");	Cell cell2 = rowHeader.createCell(1, Cell.CELL_TYPE_STRING);	cell2.setCellValue("姓名");	Cell cell3 = rowHeader.createCell(2, Cell.CELL_TYPE_STRING); 	 	response.reset();	// 设置response的Header	response.addHeader("Content-Disposition", "attachment;filename="			+ CommonUtils.getUUID() + ".xls");	OutputStream out = new BufferedOutputStream(response.getOutputStream());	response.setContentType("application/octet-stream");	workbook.write(out);	out.flush();	IOUtils.closeQuietly(out);}