导出多个文件到一个Excel中的不同sheets

@ApiOperation(value = "导出多个文件到一个Excel中的不同sheets", produces = "application/octet-stream")
@PostMapping("/exportMultipleExcel")
public void exportMultipleExcel(@RequestBody DataCountVO dataCountVO, HttpServletResponse response) throws Exception {
    // 设置响应的ContentType和Header，告诉浏览器下载文件
    response.setContentType("application/vnd.ms-excel");
    response.setHeader("Access-Control-Expose-Headers","Content-Disposition");
    response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("数据统计表.xls", "UTF-8"));

    // 创建Excel工作簿
    Workbook workbook = new HSSFWorkbook();

    // 获取各个数据集
    List<goodsStatusVO> goodsStatusList = snShipmentManageService.goodsStatus(dataCountVO);
    List<goodsPartVO> goodsPartList = snShipmentManageService.goodsPart(dataCountVO);
    List<shipCountVO> shipCountList = snShipmentManageService.shipCount(dataCountVO);
    List<loadingStatusVO> loadingStatusList = snShipmentManageService.loadingStatus(dataCountVO);


    // 创建参数对象（用来设定excel得sheet得内容等信息）
    ExportParams goodsExport = new ExportParams();
    // 设置sheet得名称
    goodsExport.setSheetName("品种销售情况");
    // 创建sheet1使用得map
    Map<String, Object> goodsExportMap = new HashMap<>();
    // title的参数为ExportParams类型，目前仅仅在ExportParams中设置了sheetName
    goodsExportMap.put("title", goodsExport);
    // 模版导出对应得实体类型
    goodsExportMap.put("entity", goodsStatusVO.class);
    // sheet中要填充得数据
    goodsExportMap.put("data", goodsStatusList);

    ExportParams partExport = new ExportParams();
    partExport.setSheetName("品种销量占比");
    // 创建sheet2使用得map
    Map<String, Object> partExportMap = new HashMap<>();
    partExportMap.put("title", partExport);
    partExportMap.put("entity", goodsPartVO.class);
    partExportMap.put("data", goodsPartList);

    ExportParams shipExport = new ExportParams();
    shipExport.setSheetName("客户发运量统计");
    // 创建sheet3使用得map
    Map<String, Object> shipExportMap = new HashMap<>();
    shipExportMap.put("title", shipExport);
    shipExportMap.put("entity", shipCountVO.class);
    shipExportMap.put("data", shipCountList);

    ExportParams loadingExport = new ExportParams();
    loadingExport.setSheetName("当日装车情况");
    // 创建sheet4使用得map
    Map<String, Object> loadingExportMap = new HashMap<>();
    loadingExportMap.put("title", loadingExport);
    loadingExportMap.put("entity", loadingStatusVO.class);
    loadingExportMap.put("data", loadingStatusList);
    // 将sheet1、sheet2、sheet3、sheet4使用得map进行包装
    List<Map<String, Object>> sheetsList = new ArrayList<>();
    sheetsList.add(goodsExportMap);
    sheetsList.add(partExportMap);
    sheetsList.add(shipExportMap);
    sheetsList.add(loadingExportMap);

    workbook = ExcelExportUtil.exportExcel(sheetsList, ExcelType.HSSF);

    // 将工作簿写入到响应输出流中
    try (ServletOutputStream out = response.getOutputStream()) {
        workbook.write(out);
    }
    // 关闭工作簿
    workbook.close();
}
还有就是实体类：：：：：：：VO

 序号是一个虚拟展示序号 导出文件的时候有几个数据就有几个序号  在查询的时候可以进行设置

记得加判空哦！！！！！！！！