springboot實現數據庫數據導出生成Excel報表

一.導入poi依賴

<!--        poi實現excel導入導出-->
        <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>

主要用到該依賴下的兩個類：XSSFWorkbook和HSSFWorkbook類。

XSSFWorkbook是Excel中的xlsx版本。

HSSFWorkbook是xls版本。

我使用的是xlsx版本的。

二.詳細代碼

 業務層：

@Service
public class GoodsServiceImpl implements GoodsService {

    @Autowired
    private GoodsMapper goodsMapper;
    
    @Override
    public XSSFWorkbook show() {
        List<Goods> list = goodsMapper.selectByExample(null);//查出數據庫數據
        XSSFWorkbook wb = new XSSFWorkbook();
        Sheet sheet = wb.createSheet("Goods");//創建一張表
        Row titleRow = sheet.createRow(0);//創建第一行，起始為0
        titleRow.createCell(0).setCellValue("序號");//第一列
        titleRow.createCell(1).setCellValue("名稱");
        titleRow.createCell(2).setCellValue("數量");
        titleRow.createCell(3).setCellValue("庫存");
        int cell = 1;
        for (Goods goods : list) {
            Row row = sheet.createRow(cell);//從第二行開始保存數據
            row.createCell(0).setCellValue(cell);
            row.createCell(1).setCellValue(goods.getGname());//將數據庫的數據遍歷出來
            row.createCell(2).setCellValue(goods.getGprice());
            row.createCell(3).setCellValue(goods.getTid());
            cell++;
        }
        return wb;
    }

 控制層:

@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報表.xlsx";
            OutputStream outputStream =null;
            try {
                fileName = URLEncoder.encode(fileName,"UTF-8");
                //設置ContentType請求信息格式
                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.測試

運行項目，瀏覽器輸入請求地址:/export/goods 就會彈出保存文件地址。