springboot实现数据库数据导出生成Excel报表

一.导入poi依赖

<!--        poi实现excel导入导出-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.15</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>3.15</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.15</version>
        </dependency>

主要用到该依赖下的两个类：XSSFWorkbook和HSSFWorkbook类。

XSSFWorkbook是Excel中的xlsx版本。

HSSFWorkbook是xls版本。

我使用的是xlsx版本的。

二.详细代码

 业务层：

@Service
public class GoodsServiceImpl implements GoodsService {

    @Autowired
    private GoodsMapper goodsMapper;
    
    @Override
    public XSSFWorkbook show() {
        List<Goods> list = goodsMapper.selectByExample(null);//查出数据库数据
        XSSFWorkbook wb = new XSSFWorkbook();
        Sheet sheet = wb.createSheet("Goods");//创建一张表
        Row titleRow = sheet.createRow(0);//创建第一行，起始为0
        titleRow.createCell(0).setCellValue("序号");//第一列
        titleRow.createCell(1).setCellValue("名称");
        titleRow.createCell(2).setCellValue("数量");
        titleRow.createCell(3).setCellValue("库存");
        int cell = 1;
        for (Goods goods : list) {
            Row row = sheet.createRow(cell);//从第二行开始保存数据
            row.createCell(0).setCellValue(cell);
            row.createCell(1).setCellValue(goods.getGname());//将数据库的数据遍历出来
            row.createCell(2).setCellValue(goods.getGprice());
            row.createCell(3).setCellValue(goods.getTid());
            cell++;
        }
        return wb;
    }

 控制层:

@Controller
public class GoodsController {

        @Autowired
        private GoodsService goodsService;
        
        @RequestMapping(value = "/export/goods",method = RequestMethod.GET)
        public void goodsExcel(HttpServletResponse response){
            XSSFWorkbook wb =goodsService.show();
            String fileName = "Goods报表.xlsx";
            OutputStream outputStream =null;
            try {
                fileName = URLEncoder.encode(fileName,"UTF-8");
                //设置ContentType请求信息格式
                response.setContentType("application/vnd.ms-excel");
                response.setHeader("Content-disposition", "attachment;filename=" + fileName);
                outputStream = response.getOutputStream();
                wb.write(outputStream);
                outputStream.flush();
                outputStream.close();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

三.测试

运行项目，浏览器输入请求地址:/export/goods 就会弹出保存文件地址。