EasyPoi Excel多Sheet导出(Java spring boot)

本文摘要

文中介绍了便捷Excel轮子easypoi,特点及使用方法,以及如何实现Excel多Sheet的导出功能

前言

Excel 作为开发中常用功能,经常需要用到,小老弟找了网上一些多Sheet导出的实现,都不太满意,因此根据EasyPoi的说明文档写了一个工具类,在这里和大家分享
EasyPoi和阿里的EasyExcel都有用过,是为便捷操作Excel的开源轮子,基于不重复造的原则,小老弟对使用较多的easyPoi进行本文所需功能的实现

EasyPoi支持如下

功能列表	详细
Excel导入	注解导入 && Map导入 && 大数据量导入sax模式 && 导入文件保存 && 文件校验 && 字段校验
Excel导出	注解导出 && 模板导出 && html导出,Excel自适应xls和xlsx两种格式
Excel转html
word导出	word只支持docx模式
pdf导出

准备工作

<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-spring-boot-starter</artifactId>
    <version>4.0.0</version>
</dependency>

多sheet的Excel导出

生成workbook关键代码

    /**
     * 创建workbook,
     * 通过maplist填充Excel内容
     * 返回workbook
     *
     * 进一步使用可以写入流,e.g.
     * FileOutputStream fos = new FileOutputStream(file);
     * workbook.write(fos);
     * */
    public static Workbook mutiSheet(List<Map<String, Object>> mapListList){
        Workbook workbook = null;
        workbook = ExcelExportUtil.exportExcel(mapListList,ExcelType.XSSF);
        return workbook;
    }

多sheet工具类WorkBookUtils

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import com.jdcloud.task.domain.vo.wenxian.IndustryStoreMomFungi;
import org.apache.poi.ss.usermodel.Workbook;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class WorkBookUtils {
    /**
     * 创建workbook,
     * 通过maplist填充Excel内容
     * 返回workbook
     *
     * 进一步使用可以写入流,e.g.
     * FileOutputStream fos = new FileOutputStream(file);
     * workbook.write(fos);
     * */
    public static Workbook mutiSheet(List<Map<String, Object>> mapListList){
        Workbook workbook = null;
        workbook = ExcelExportUtil.exportExcel(mapListList,ExcelType.XSSF);
        return workbook;
    }
    public static Map<String, Object> createOneSheet(ExportParams exportParams,Class<?> clazz,List<?> data){
        Map<String, Object> map = new HashMap<>();
        map.put("title",exportParams);//new ExportParams("title"+i, "sheetName"+i, ExcelType.XSSF)
        map.put("entity", clazz);
        map.put("data",data);
        return map;
    }
    /*
    * 创建一个表格并填充内容
    * 返回map供工作簿使用
    * */
    public static Map<String, Object> createOneSheet(String sheetName,String title,Class<?> clazz,List<?> data){
        ExportParams exportParams = new ExportParams(title,sheetName, ExcelType.XSSF);
        return createOneSheet(exportParams,clazz,data);
    }
}

service

    /**
     * 将数据存储进response,调用接口就能下载文件
     * */
    public void exportData(HttpServletRequest request, HttpServletResponse response ) throws URISyntaxException, IOException {
        String fileName="data.xlsx";
        File file = createDatafile(fileName);
        Object data=null;
        fillData(file,data);
        datatoResponse(request,response,file,fileName);
    }

    /**
     * 将数据存储进response,调用接口就能下载文件
     * */
    private void datatoResponse(HttpServletRequest request, HttpServletResponse response,File file,String fileName) throws IOException {
        OutputStream out = null;
        FileInputStream in = null;
        try {
            // 1.读取要下载的内容
            in = new FileInputStream(file);
            // 2. 告诉浏览器下载的方式以及一些设置
            // 解决文件名乱码问题，获取浏览器类型，转换对应文件名编码格式，IE要求文件名必须是utf-8, firefo要求是iso-8859-1编码
            String agent = request.getHeader("user-agent");
            if (agent.contains("FireFox")) {
                fileName = new String(fileName.getBytes("UTF-8"), "iso-8859-1");
            } else {
                fileName = URLEncoder.encode(fileName, "UTF-8");
            }
            // 设置下载文件的mineType，告诉浏览器下载文件类型
            String mineType = request.getServletContext().getMimeType(fileName);
            response.setContentType(mineType);
            // 设置一个响应头，无论是否被浏览器解析，都下载
            response.setHeader("Content-disposition", "attachment; filename=" + fileName);
            // 将要下载的文件内容通过输出流写到浏览器
            out = response.getOutputStream();
            int len = 0;
            byte[] buffer = new byte[1024];
            while ((len = in.read(buffer)) > 0) {
                out.write(buffer, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                out.close();
            }
            if (in != null) {
                in.close();
            }
        }
    }
    /**
     *  设置文件路径 && 保证文件对象的正确打开
     * */
    private File createDatafile(String fileName) throws URISyntaxException, IOException {
        File file = null;
        String resource = this.getClass().getClassLoader().getResource("").getPath()+fileName;
        URI uri = new URI(resource);
        File myFile = new File(resource);//创建File对象，参数为String类型，表示目录名
        //判断文件是否存在，如不存在则调用createNewFile()创建新目录，否则跳至异常处理代码
        if(!myFile.exists()) myFile.createNewFile();
        System.out.println("文件创建成功");
        return myFile;
    }

    private File fillData(File savefile,Object data) throws IOException {
        List<Map<String, Object>> lists = new ArrayList<>();
        //sheet1
        List<Map<String, String>> datas1 = excelDao.queryTableColumns("whole_network_wenxian_region_trend_info");
        Map<String, Object> temp1 = WorkBookUtils.createOneSheet("表1", "表头大标题", Map.class, datas1);
        lists.add(temp1);
        //sheet2
        List<Map<String, String>> datas2 = excelDao.queryTableColumns("whole_network_wenxian_industry_trend");
        Map<String, Object> temp2 = WorkBookUtils.createOneSheet("表2", "表头大标题", Map.class, datas2);
        lists.add(temp2);
        Workbook workbook = WorkBookUtils.mutiSheet(lists);
        FileOutputStream fos = new FileOutputStream(savefile);
        workbook.write(fos);
        fos.close();
        return savefile;
    }

controller

    @RequestMapping("/export")
    public void export(HttpServletRequest request, HttpServletResponse response) throws Exception {
        excelService.exportData(request,response);
    }

最终的效果图