Poi工具使用

 引入poi依賴

<!-- poi 相關jar包 -->
<dependency>
     <groupId>org.apache.poi</groupId>
     <artifactId>poi</artifactId>
     <version>3.17</version>
</dependency>

POI導出

@RestController
@RequestMapping("/poi")
public class PoiController {

    @RequestMapping("/poiOut")
    public void poiImport(HttpServletResponse response) throws IOException {

        //新建excel文檔
        HSSFWorkbook workbook = new HSSFWorkbook();

        //字體樣式
        HSSFFont font = workbook.createFont();
        font.setColor(Font.COLOR_RED);
        font.setBold(true);

        //日期格式化
        HSSFDataFormat dataFormat = workbook.createDataFormat();
        short format = dataFormat.getFormat("yyyy-MM-dd");

        //標題單元格樣式
        HSSFCellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setFont(font);
        cellStyle.setAlignment(HorizontalAlignment.CENTER);

        //內容單元格樣式
        HSSFCellStyle cellStyle1 = workbook.createCellStyle();
        cellStyle1.setDataFormat(format);

        //創建excel工作表
        HSSFSheet sheet = workbook.createSheet("aaa");
        sheet.setColumnWidth(3,40*256);  //必須乘於256

        //創建行
        HSSFRow row = sheet.createRow(0);

        String[] arr = {"ID","文章標題","文章描述","創建時間","熱度"};

        for (int i=0;i<arr.length;i++) {
            HSSFCell cell = row.createCell(i);
            cell.setCellValue(arr[i]);
            cell.setCellStyle(cellStyle);
        }


        List<Article> list = new ArrayList<Article>();
        list.add(new Article("001","HTML5","文章沒有內容，就是湊字數",new Date(),1));
        list.add(new Article("002","HTML5","文章沒有內容，就是湊字數",new Date(),2));
        list.add(new Article("003","HTML5","文章沒有內容，就是湊字數",new Date(),3));
        list.add(new Article("004","HTML5","文章沒有內容，就是湊字數",new Date(),4));

        for (int i=0;i<list.size();i++) {
            HSSFRow row1 = sheet.createRow(i + 1);
            row1.createCell(0).setCellValue(list.get(i).getId());
            row1.createCell(1).setCellValue(list.get(i).getTitle());
            row1.createCell(2).setCellValue(list.get(i).getDescription());

            HSSFCell cell = row1.createCell(3);
            cell.setCellValue(list.get(i).getCreateTime());
            cell.setCellStyle(cellStyle1);

            row1.createCell(4).setCellValue(list.get(i).getHotValue());
        }


        //web瀏覽通過MIME類型判斷文件是excel類型
        response.setContentType("application/vnd.ms-excel;charset=utf-8");
        response.setCharacterEncoding("utf-8");

        // 對文件名進行處理。防止文件名亂碼
        String fileName = URLEncoder.encode("合同.xls", "UTF-8");
        // Content-disposition屬性設置成以附件方式進行下載
        response.setHeader("Content-disposition", "attachment;filename=" + fileName);
        OutputStream os = response.getOutputStream();
        workbook.write(os);
        os.flush();
        os.close();

    }

}

POI導入