传智健康项目讲义第十章 九

3.4 后台代码 
在ReportController中提供exportBusinessReport方法，基于POI将数据写入到Excel中并通过输出流下载到客户端

/**
* 导出Excel报表
* @return
*/
@RequestMapping("/exportBusinessReport")
public Result exportBusinessReport(HttpServletRequest request,
HttpServletResponse response){
try{
//远程调用报表服务获取报表数据
Map<String, Object> result = reportService.getBusinessReport();
//取出返回结果数据，准备将报表数据写入到Excel文件中
String reportDate = (String) result.get("reportDate");
Integer todayNewMember = (Integer) result.get("todayNewMember");
Integer totalMember = (Integer) result.get("totalMember");
Integer thisWeekNewMember = (Integer)
result.get("thisWeekNewMember");
Integer thisMonthNewMember = (Integer)
result.get("thisMonthNewMember");
Integer todayOrderNumber = (Integer) result.get("todayOrderNumber");
Integer thisWeekOrderNumber = (Integer)
result.get("thisWeekOrderNumber");
Integer thisMonthOrderNumber = (Integer)
result.get("thisMonthOrderNumber");
Integer todayVisitsNumber = (Integer)
result.get("todayVisitsNumber");
Integer thisWeekVisitsNumber = (Integer)
result.get("thisWeekVisitsNumber");
Integer thisMonthVisitsNumber = (Integer)
result.get("thisMonthVisitsNumber");
List<Map> hotSetmeal = (List<Map>) result.get("hotSetmeal");
//获得Excel模板文件绝对路径
String temlateRealPath =
request.getSession().getServletContext().getRealPath("template") +
File.separator +
"report_template.xlsx";
//读取模板文件创建Excel表格对象
XSSFWorkbook workbook = new XSSFWorkbook(new FileInputStream(newFile(temlateRealPath)));
XSSFSheet sheet = workbook.getSheetAt(0);
XSSFRow row = sheet.getRow(2);
row.getCell(5).setCellValue(reportDate);//日期
row = sheet.getRow(4);
row.getCell(5).setCellValue(todayNewMember);//新增会员数（本日）
row.getCell(7).setCellValue(totalMember);//总会员数
row = sheet.getRow(5);
row.getCell(5).setCellValue(thisWeekNewMember);//本周新增会员数
row.getCell(7).setCellValue(thisMonthNewMember);//本月新增会员数
row = sheet.getRow(7);
row.getCell(5).setCellValue(todayOrderNumber);//今日预约数
row.getCell(7).setCellValue(todayVisitsNumber);//今日到诊数
row = sheet.getRow(8);
row.getCell(5).setCellValue(thisWeekOrderNumber);//本周预约数
row.getCell(7).setCellValue(thisWeekVisitsNumber);//本周到诊数
row = sheet.getRow(9);
row.getCell(5).setCellValue(thisMonthOrderNumber);//本月预约数
row.getCell(7).setCellValue(thisMonthVisitsNumber);//本月到诊数
int rowNum = 12;
for(Map map : hotSetmeal){//热门套餐
String name = (String) map.get("name");
Long setmeal_count = (Long) map.get("setmeal_count");
BigDecimal proportion = (BigDecimal) map.get("proportion");
row = sheet.getRow(rowNum ++);
row.getCell(4).setCellValue(name);//套餐名称
row.getCell(5).setCellValue(setmeal_count);//预约数量
row.getCell(6).setCellValue(proportion.doubleValue());//占比
}
//通过输出流进行文件下载
ServletOutputStream out = response.getOutputStream();
response.setContentType("application/vnd.ms‐excel");
response.setHeader("content‐Disposition","attachment;filename=report.xlsx");
workbook.write(out);
out.flush();
out.close();
workbook.close();
return null;
}catch (Exception e){
return new Result(false,
MessageConstant.GET_BUSINESS_REPORT_FAIL,null);
}
}