一个处女座的暖男程序猿

EasyExcel的导出

   //导出
    @GetMapping("/exportData")
    public void exportData(HttpServletResponse response) {
        categoryService.exportData(response);
    }

//导出
    @Override
    public void exportData(HttpServletResponse response) {
        try {
            //1 设置响应头信息和其他信息
            response.setContentType("application/vnd.ms-excel");
            response.setCharacterEncoding("utf-8");

            // 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
            String fileName = URLEncoder.encode("分类数据", "UTF-8");

            //设置响应头信息 Content-disposition
            response.setHeader("Content-disposition","attachment;filename="+fileName+".xlsx");

            //2 调用mapper方法查询所有分类，返回list集合
            List categoryList = categoryMapper.findAll();

            //最终数据list集合
            List categoryExcelVoList = new ArrayList<>();
            // List  --  List
            for(Category category : categoryList) {
                CategoryExcelVo categoryExcelVo = new CategoryExcelVo();
                //把category值获取出来，设置到categoryExcelVo里面
//                Long id = category.getId();
//                categoryExcelVo.setId(id);
                BeanUtils.copyProperties(category,categoryExcelVo);
                categoryExcelVoList.add(categoryExcelVo);
            }

            //3 调用EasyExcel的write方法完成写操作
            EasyExcel.write(response.getOutputStream(), CategoryExcelVo.class)
                    .sheet("分类数据").doWrite(categoryExcelVoList);
        }catch (Exception e) {
            e.printStackTrace();
            throw new GuiguException(ResultCodeEnum.DATA_ERROR);
        }
    }