#Java 导出 excel 数据

<!-- jxls poi -->

        <dependency>

            <groupId>org.apache.poi</groupId>

            <artifactId>poi</artifactId>

            <version>3.15</version>

        </dependency>

        <dependency>

            <groupId>org.apache.poi</groupId>

            <artifactId>poi-ooxml</artifactId>

            <version>3.15</version>

        </dependency>

        <dependency>

            <groupId>org.apache.poi</groupId>

            <artifactId>poi-scratchpad</artifactId>

            <version>3.15</version>

        </dependency>

import lombok.Data;

@Data

public class AreaModel {

    private Integer no;

    private Integer areaCode;

    private String areaName;

    private Integer level;

}

import net.sf.jxls.transformer.XLSTransformer;

import org.apache.poi.ss.usermodel.Workbook;

import javax.servlet.http.HttpServletResponse;

import java.io.*;

import java.net.URLEncoder;

import java.util.Map;

public class TemplateExcelUtils {

    /**

     * 根据模板导出数据
     * @param fileName
     * @param sourcePath resource/template文件夹下路径
     * @param beanParams
     * @param response
     * @throws Exception
     */
    public static void downLoadExcel(String fileName,String sourcePath, Map<String, Object> beanParams, HttpServletResponse response)
            throws Exception {
        try{
            OutputStream os = getOutputStream(fileName,response);
            //读取模板
            InputStream is = TemplateExcelUtils.class.getClassLoader().getResourceAsStream("template/"+sourcePath);
            XLSTransformer transformer = new XLSTransformer();
            //向模板中写入内容
            Workbook workbook = transformer.transformXLS(is, beanParams);
            //写入成功后转化为输出流
            workbook.write(os);
        }catch (Exception e){
            e.printStackTrace();
            throw e;
        }
    }

    /**

     * 导出文件时为Writer生成OutputStream.
     * @param fileName 文件名
     * @param response response
     * @return ""
     */
    private static OutputStream getOutputStream(String fileName,
                                                HttpServletResponse response) throws Exception {
        try {
            fileName = URLEncoder.encode(fileName, "UTF-8");
            response.setContentType("application/vnd.ms-excel");
            response.setCharacterEncoding("utf8");
            response.setHeader("Content-Disposition", "attachment; filename=" + fileName + ".xls");
            response.setHeader("Pragma", "public");
            response.setHeader("Cache-Control", "no-store");
            response.addHeader("Cache-Control", "max-age=0");
            return response.getOutputStream();
        } catch (IOException e) {
            throw new Exception("导出excel表格失败!", e);
        }
    }
}

@Override

    public void exportTemplateProvinceAreaData(HttpServletResponse response){

        List<Area> areas = areaMapper.queryProvinceArea();  // 此处是我本地项目的mapper，是为了获取省份数据

        List<AreaModel> result = new ArrayList<>();

        areas.stream().forEach(area -> {

            AreaModel areaModel = new AreaModel();

            BeanUtils.copyProperties(area,areaModel);

            result.add(areaModel);

        });

        IntStream.range(0, result.size()).forEach(i -> {

            result.get(i).setNo(i+1);

        });

        try {

            Map<String,Object> param = new HashMap<>();

            param.put("title","省份数据");

            param.put("list",result);

            TemplateExcelUtils.downLoadExcel("省份数据","province.xls",param,response);

        } catch (Exception e) {

            throw new ServiceException(ResultCode.EXPORT_ERROR);

        }

    }

@GetMapping("/exportTemplateData")

    public void exportTemplateData(HttpServletResponse response){

        areaService.exportTemplateProvinceAreaData(response);

    }

<!--easy poi excel文件导出-->

        <dependency>

            <groupId>cn.afterturn</groupId>

            <artifactId>easypoi-spring-boot-starter</artifactId>

            <version>4.0.0</version>

        </dependency>

private void excelExport(List<TencentMeetingParticipantResultVO> list, MeetingLive meetingLive,

                             HttpServletResponse response) {

        String fileName = "参会成员信息表";

        TemplateExportParams param = new TemplateExportParams("templates/canhuixinxi.xlsx", true);

        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        Map<String, Object> data = new HashMap<>();

        data.put("title", meetingLive.getName());

        data.put("id", meetingLive.getLiveId());

        String userName = "";

        if(!StringUtils.isEmpty(meetingLive.getCreateUser())){

            User user = userMapper.selectById(meetingLive.getCreateUser());

            if(user!=null){

                userName = user.getFirstName() + user.getLastName();

            }

        }

        data.put("user", userName);

        data.put("beginTime", format.format(meetingLive.getBeginTime()));

        data.put("endTime", format.format(meetingLive.getEndTime()));

        data.put("list", list);//导出list集合

        try {

            Workbook book = ExcelExportUtil.exportExcel(param, data);

            //下载方法

            export(response, book, fileName);

        } catch (Exception e) {

            System.out.println("导出模板Excel，失败:" + e);

        }

    }

    /**

     * export导出请求头设置
     *
     * @param response
     * @param workbook
     * @param fileName
     * @throws Exception
     */
    private static void export(HttpServletResponse response, Workbook workbook, String fileName) throws Exception {
        response.reset();
        response.setContentType("application/x-msdownload");
        response.setHeader("Content-disposition", "attachment; filename=" + java.net.URLEncoder.encode(fileName+".xlsx", "UTF-8"));
        ServletOutputStream outStream = null;
        try {
            outStream = response.getOutputStream();
            workbook.write(outStream);
        } finally {
            outStream.close();
        }

    }