java通过模板导出到Excel-编程知识

java通过模板导出到Excel

依赖

依赖,该项目是gradle管理依赖，需要maven的可以去maven仓库找一下对应的依赖

implementation 'com.alibaba:easyexcel:2.2.10'

控制层

    @Operation(summary = "导出excel")@GetMapping("/export")public void exportExcel(@RequestParam String startTime, @RequestParam String endTime, HttpServletResponse response) {userDownloadStatisticsService.exportExcel(startTime, endTime, response);}

业务层

public void exportExcel(String startTime, String endTime, HttpServletResponse response) {//查询需要导出的数据LambdaQueryWrapper<UserDownloadStatistics> wrapper = new LambdaQueryWrapper<>();wrapper.between(UserDownloadStatistics::getDownloadTime, startTime, endTime);wrapper.orderBy(true, true, UserDownloadStatistics::getDownloadTime);List<UserDownloadStatistics> statisticsList = list(wrapper);//封装成导出模板List<UserStatisticsExcel> excelList = new ArrayList<>();statisticsList.forEach(date -> excelList.add(new UserStatisticsExcel(date.getDayDownloadNum(), date.getDownloadTime().toString())));String fileName = startTime + "~" + endTime + ".新增注册用户数.xlsx";//设置要下载的文件的名称ClassPathResource classPathResource = new ClassPathResource("/template/新增注册用户数.xlsx");InputStream inputStream = classPathResource.getStream();try {ServletOutputStream out = response.getOutputStream();//设置文件类型response.setContentType("application/vnd.ms-excel;charset=UTF-8");//设置编码格式response.setCharacterEncoding("utf-8");response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xlsx");//创建excelExcelWriter excelWriter = EasyExcel.write(response.getOutputStream()).withTemplate(inputStream).build();// 创建sheetWriteSheet writeSheet = EasyExcel.writerSheet(0).build();FillConfig fillConfig = FillConfig.builder().forceNewRow(Boolean.TRUE).build();excelWriter.fill(excelList, fillConfig, writeSheet);//填充完成excelWriter.finish();out.flush();} catch (IOException e) {e.printStackTrace();}}