多sheet页导出

核心代码就是下图里面的，使用EasyExcel.writeSheet创建一个sheet,然后用excelWriter写入就行了，很简单

    @GetMapping("downloadMultiSheet")
    public void downloadMultiSheet(HttpServletResponse response) throws IOException {
        // 导出excel如果失败会返回json
        try {
            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            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("测试", "UTF-8").replaceAll("\\+", "%20");
            response.setHeader("Content-disposition", "attachment;filename*=" + fileName + ".xlsx");

            ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream()).build();
            // 每次都要创建writeSheet 这里注意必须指定sheetNo 而且sheetName必须不一样。
            // sheetNo从0开始
            WriteSheet writeSheet = EasyExcel.writerSheet(0, "用户").head(User.class).build();
            // 去数据库查找数据
            List<User> users = userService.list();
            excelWriter.write(users, writeSheet);
            writeSheet = EasyExcel.writerSheet(1, "部门").head(Department.class).build();
            // 去数据库查找数据
            List<Department> departments = departmentService.list();
            excelWriter.write(departments, writeSheet);
            // 写完要关闭，否则缓冲区数据会丢失
            excelWriter.close();
        } catch (Exception e) {
            // 重置response
            response.reset();
            response.setContentType("application/json");
            response.setCharacterEncoding("utf-8");
            Map<String, String> map = MapUtils.newHashMap();
            map.put("status", "failure");
            map.put("message", "下载文件失败" + e.getMessage());
            response.getWriter().println(JSON.toJSONString(map));
        }
    }

多sheet导入

核心代码如图所示，使用EasyExcel.readSheet读取不同的sheet

    @PostMapping("uploadMultiSheet")
    public Result uploadMultiSheet(@RequestPart MultipartFile file) throws IOException {
        try (ExcelReader excelReader = EasyExcel.read(file.getInputStream()).build()) {
            // 这里为了简单 所以注册了 同样的head 和Listener 自己使用功能必须不同的Listener
            // sheetNo从0开始
            ReadSheet readSheet1 =
                    EasyExcel.readSheet(0).head(User.class).registerReadListener(new PageReadListener<User>(users -> {
                        userService.saveBatch(users);
                    })).build();
            ReadSheet readSheet2 =
                    EasyExcel.readSheet(1).head(Department.class).registerReadListener(new PageReadListener<Department>(departments -> {
                        departmentService.saveBatch(departments);
                    })).build();
            // 这里注意 一定要把sheet1 sheet2 一起传进去，不然有个问题就是03版的excel 会读取多次，浪费性能
            excelReader.read(readSheet1, readSheet2);
        }
        return resultOk();
    }