java 使用 HSSF方式+Maven 实现excle导出

1、引入maven依赖

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.9</version>
</dependency>

<dependency> <!-- 操作File好用 可选 -->
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

2、代码实现导出

　　　　　//列表标题
        LinkedHashMap<String, Integer> cellTitle = new LinkedHashMap<>();
        cellTitle.put("序号",3000);
        cellTitle.put("受理编号",9000);
        cellTitle.put("专业",6000);
        cellTitle.put("档案",4000);
        cellTitle.put("文书",4000);
        cellTitle.put("检材数",4000);
        cellTitle.put("姓名1",6000);
        cellTitle.put("接收时间",7000);

        //内容列表
        List<Map<String, Object>> datalist  = new ArrayList<>();
        Map<String, Object> data = new HashMap<>();
        data.put("RN",1);
        data.put("ACCEPT_NO","J530100-M-202102595");
        data.put("IDENTIFY_ITEM_NAME","检验");
        data.put("entrNum", 1);
        data.put("appraNum", null);
        data.put("evidNum", 3);
        data.put("TRANSFER_PERSON_NAME","李某");
        data.put("UPDATE_DATE","2021年8月20日");
        datalist.add(data);

        //创建HSSFWorkbook工作薄对象
        HSSFWorkbook workbook=new HSSFWorkbook();
        //创建HSSFSheet对象
        HSSFSheet sheet=workbook.createSheet("sheet1");

        //设置单元格标题宽度
        Integer titleIndex = 0;
        for (String key : cellTitle.keySet()){
            sheet.setColumnWidth(titleIndex,cellTitle.get(key));
            titleIndex++;
        }

        HSSFFont font = workbook.createFont();
        font.setFontName("宋体");
        //加粗
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        font.setFontHeightInPoints(new Short("13"));
        HSSFCellStyle style = workbook.createCellStyle();
        style.setFont(font);
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//水平居中
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//上下居中
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框

        //设置标识内容，创建行的单元格，从0开始
        HSSFRow row = sheet.createRow(0);
        row.setHeight(new Short("600"));
        Integer cellTitleIndex = 0;
        for (String key : cellTitle.keySet()){
            HSSFCell cell = row.createCell(cellTitleIndex);
            cell.setCellStyle(style);
            cell.setCellValue(key);
            cellTitleIndex++;
        }


        HSSFFont fontData = workbook.createFont();
        fontData.setFontName("宋体");
        //加粗
        fontData.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        fontData.setFontHeightInPoints(new Short("13"));

        HSSFCellStyle styleData = workbook.createCellStyle();
        styleData.setFont(fontData);
        styleData.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//水平居中
        styleData.setAlignment(HSSFCellStyle.ALIGN_CENTER);//上下居中
        styleData.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
        styleData.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
        styleData.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
        styleData.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
        //设置背景白色
        styleData.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        styleData.setFillForegroundColor(HSSFColor.WHITE.index);

        //开始渲染记录数据
        for (int i = 0; i < datalist.size(); i++) {

            HSSFRow rowData = sheet.createRow(i+1);
            rowData.setHeight(new Short("600"));

            Map<String, Object> dataMap = datalist.get(i);

            HSSFCell cell = rowData.createCell(0);
            cell.setCellStyle(styleData);
            cell.setCellValue(Objects.toString(dataMap.get("RN")));

            HSSFCell cell1 = rowData.createCell(1);
            cell1.setCellStyle(styleData);
            cell1.setCellValue(Objects.toString(dataMap.get("ACCEPT_NO")));

            HSSFCell cell2 = rowData.createCell(2);
            cell2.setCellStyle(styleData);
            cell2.setCellValue(Objects.toString(dataMap.get("IDENTIFY_ITEM_NAME")));


            HSSFCell cell3 = rowData.createCell(3);
            cell3.setCellStyle(styleData);
            if(Objects.nonNull(dataMap.get("entrNum"))){
                cell3.setCellValue("√");
            }else{
                cell3.setCellValue("");
            }

            HSSFCell cell4 = rowData.createCell(4);
            cell4.setCellStyle(styleData);
            if(Objects.nonNull(dataMap.get("appraNum"))){
                cell4.setCellValue("√");
            }else{
                cell4.setCellValue("");
            }

            HSSFCell cell5 = rowData.createCell(5);
            cell5.setCellStyle(styleData);
            cell5.setCellValue(Objects.toString(dataMap.get("evidNum")));

            HSSFCell cell6 = rowData.createCell(6);
            cell6.setCellStyle(styleData);
            cell6.setCellValue(Objects.toString(dataMap.get("TRANSFER_PERSON_NAME")));

            HSSFCell cell7 = rowData.createCell(7);
            cell7.setCellStyle(styleData);
            cell7.setCellValue(Objects.toString(dataMap.get("UPDATE_DATE")));

        }

        //创建文档信息
        workbook.createInformationProperties();

        //将文件存到浏览器设置的下载位置
        String path = "E:\";
        String filename =  System.currentTimeMillis()+".xls";

        try {
            OutputStream out = new FileOutputStream(path+filename);
            workbook.write(out);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

如果是web请求下载导出，可以使用流转换方式：

 　　　　//将文件存到浏览器设置的下载位置
        String filename =  "xxxx"+new SimpleDateFormat("yyyy年MM月dd日HH点mm分").format(new Date()).toString()+".xls";
        response.setContentType("application/ms-excel;charset=UTF-8");
        response.setHeader("Content-Disposition", "attachment;filename=".concat(String.valueOf(URLEncoder.encode(filename, "UTF-8"))));
        OutputStream os = response.getOutputStream();
        try {
            workbook.write(os);// 将数据写出去
            os.flush();
            String str = "导出" + filename + "成功！";
            System.out.println(str);
        } catch (Exception e) {
            e.printStackTrace();
            String str1 = "导出" + filename + "失败！";
            System.out.println(str1);
        } finally {
            os.close();
        }