maven依赖

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>

PoiUtils 工具类

public class PoiUtils {
    public static ResponseEntity<byte[]> exportArticleExcel(List<ArticleVO> articles) {
        HttpHeaders headers = null;
        ByteArrayOutputStream baos = null;
        try {
            //1.创建Excel文档
            HSSFWorkbook workbook = new HSSFWorkbook();
            //2.创建文档摘要
            workbook.createInformationProperties();
            //3.获取文档信息，并配置
            DocumentSummaryInformation dsi = workbook.getDocumentSummaryInformation();
            //3.1文档类别
            dsi.setCategory("文章信息");
            //3.2设置文档管理员
            dsi.setManager("哨戒班");
            //3.3设置组织机构
            dsi.setCompany("26");
            //4.获取摘要信息并配置
            SummaryInformation si = workbook.getSummaryInformation();
            //4.1设置文档主题
            si.setSubject("文章");
            //4.2.设置文档标题
            si.setTitle("首页文章");
            //4.3 设置文档作者
            si.setAuthor("26");
            //4.4设置文档备注
            si.setComments("备注信息暂无");
            //创建Excel表单
            HSSFSheet sheet = workbook.createSheet("文章表");
            //创建日期显示格式
            HSSFCellStyle dateCellStyle = workbook.createCellStyle();
            dateCellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy"));
            //创建标题的显示样式
            HSSFCellStyle headerStyle = workbook.createCellStyle();
            headerStyle.setFillForegroundColor(IndexedColors.YELLOW.index);
            headerStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
            //定义列的宽度
            sheet.setColumnWidth(0, 5 * 256);
            sheet.setColumnWidth(1, 12 * 256);
            sheet.setColumnWidth(2, 10 * 256);
            sheet.setColumnWidth(3, 5 * 256);
            sheet.setColumnWidth(4, 12 * 256);
            //5.设置表头
            HSSFRow headerRow = sheet.createRow(0);
            HSSFCell cell0 = headerRow.createCell(0);
            cell0.setCellValue("文章id");
            cell0.setCellStyle(headerStyle);
            HSSFCell cell1 = headerRow.createCell(1);
            cell1.setCellValue("作者id");
            cell1.setCellStyle(headerStyle);
            HSSFCell cell2 = headerRow.createCell(2);
            cell2.setCellValue("标题");
            cell2.setCellStyle(headerStyle);
            HSSFCell cell3 = headerRow.createCell(3);
            cell3.setCellValue("内容");
            cell3.setCellStyle(headerStyle);
            HSSFCell cell4 = headerRow.createCell(4);
            cell4.setCellValue("创建日期");
            cell4.setCellStyle(headerStyle);
            //6.装数据
            for (int i = 0; i < articles.size(); i++) {
                HSSFRow row = sheet.createRow(i + 1);
                ArticleVO article = articles.get(i);
                row.createCell(0).setCellValue(article.getId());
                row.createCell(1).setCellValue(article.getUId());
                row.createCell(2).setCellValue(article.getTitle());
                row.createCell(3).setCellValue(article.getContent());
                HSSFCell CreateTimeCell = row.createCell(4);
                CreateTimeCell.setCellValue(article.getCreateTime());
                CreateTimeCell.setCellStyle(dateCellStyle);
                headers = new HttpHeaders();
            }

            headers = new HttpHeaders();
            headers.setContentDispositionFormData("attachment",
                    new String("员工表.xls".getBytes("UTF-8"), "iso-8859-1"));
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            baos = new ByteArrayOutputStream();
            workbook.write(baos);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return new ResponseEntity<byte[]>(baos.toByteArray(), headers, HttpStatus.CREATED);
    }
}

Controller控制层

 @RequestMapping(value = "/exportArticle", method = RequestMethod.GET)
    public ResponseEntity<byte[]> exportEmp() {
        return PoiUtils.exportArticleExcel(articleService.selectAll());
    }