Springboot 前后端分离项目使用 POI 生成并导出 Excel的操作方法

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>5.1.0</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>5.1.0</version>
</dependency>

@RequestMapping(value = "/down", produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)

SXSSFWorkbook workbook = new SXSSFWorkbook();
//设置表格名称
SXSSFSheet sheet = workbook.createSheet("销售榜单");
//设置表格默认宽度30
sheet.setDefaultColumnWidth(30);
//设置 sheet 表格的第0行
SXSSFRow row = sheet.createRow(0);
//设置 sheet 表格的第0行第0列的值
row.createCell(0).setCellValue("商品名称");
//设置 sheet 表格的第0行第1列的值
row.createCell(1).setCellValue("数量");

//设置响应头
response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
//filename 为 Excel 文件名称

//将 Excel 表输出到输出流
OutputStream out = response.getOutputStream();
workbook.write(out);

//1、通过 SXSSFWorkbook 设置 Excel 表
//2、设置响应头
//3、输出流输出
@RequestMapping(value = "/down", produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)
public void downXlsx(HttpServletResponse response) {
    //设置表名
    String fileName = "销售榜单.xlsx";
    SXSSFWorkbook workbook = new SXSSFWorkbook();
    //设置表格名称
    SXSSFSheet sheet = workbook.createSheet("销售榜单");
    //设置表格默认宽度30
    sheet.setDefaultColumnWidth(30);
    //设置 sheet 表格的第0行
    SXSSFRow row = sheet.createRow(0);
    //设置 sheet 表格的第0行第0列的值
    row.createCell(0).setCellValue("商品名称");
    //设置 sheet 表格的第0行第1列的值
    row.createCell(1).setCellValue("数量");
    OutputStream out = null;
    try {
        //设置响应头
        response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
        response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
        //将 Excel 表输出到输出流
        out = response.getOutputStream();
        workbook.write(out);
        out.flush();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        workbook.dispose();
        try {
            if (out != null)
                out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}