JAVA 通过POI 模版，导出excel

Posted 2021-03-25 helloearth

 如有不足，欢迎指正，谢谢 !

1、Maven引入  POI jar包、模版和结果文件.rar下载

<dependency>
　　<groupId>org.apache.poi</groupId>
　　<artifactId>poi</artifactId>
　　<version>4.0.1</version>
</dependency>
<dependency>
　　<groupId>net.sf.jxls</groupId>
　　<artifactId>jxls-core</artifactId>
　　<version>1.0.4</version>
</dependency>

2、工具方法如下：

package com.***.***.***;

import net.sf.jxls.transformer.XLSTransformer;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.*;

CLASS 省略。。。

/**
     *
     * @param request
     * @param response
     * @param tempPath 模版的相对路径
     * @param resultMap 结果集
     * @throws Exception
     */
    public static void excelTempExport(HttpServletRequest request,HttpServletResponse response,String tempPath, Map resultMap) {
        String tempFileName = null;
        String newFileName = null;
        File newFile = null;
        XLSTransformer transformer = null;
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            //获得模版
            tempFileName = request.getSession().getServletContext().getRealPath(tempPath);
            //新的文件名称
            newFileName= new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
            //文件名称统一编码格式
            newFileName = URLEncoder.encode(newFileName, "utf-8");
            //生成的导出文件
            newFile = File.createTempFile(newFileName, ".xls");
            //transformer转到Excel
            transformer = new XLSTransformer();
            //将数据添加到模版中生成新的文件
            transformer.transformXLS(tempFileName, resultMap, newFile.getAbsolutePath());
            //将文件输入
            InputStream inputStream = new FileInputStream(newFile);
            // 设置response参数，可以打开下载页面
            response.reset();
            //设置响应文本格式
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            response.setHeader("Content-Disposition", "attachment;filename=" + String.valueOf((newFileName + ".xls").getBytes(), "iso-8859-1"));
            //将文件输出到页面
            ServletOutputStream out = response.getOutputStream();
            bis = new BufferedInputStream(inputStream);
            bos = new BufferedOutputStream(out);
            byte[] buff = new byte[2048];
            int bytesRead;
            // 根据读取并写入
            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, bytesRead);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            //使用完成后关闭流
            try {
                if (bis != null) {
                    bis.close();
                }
                if (bos != null) {
                    bos.close();
                }
            } catch (IOException e) {}
        }
    }

//测试类 

@RequestMapping(value = "/exportExcelTest", method = RequestMethod.GET)
public void exportExcelTest(HttpServletRequest request, HttpServletResponse response) {
    Map map = new HashMap(4);
    Map itemMap = null;
    //商户
    List<Map> merchantList = new ArrayList<Map>();
    itemMap = new HashMap();
    itemMap.put("id", 3);
    itemMap.put("merchant_name", "张3");
    itemMap.put("market_id", 1);
    itemMap.put("market_name", "市场1");
    merchantList.add(itemMap);
    itemMap = new HashMap();
    itemMap.put("id", 4);
    itemMap.put("merchant_name", "张5");
    itemMap.put("market_id", 2);
    itemMap.put("market_name", "市场2");
    merchantList.add(itemMap);
    map.put("merchantList", merchantList);

    //品类
    List<Map> bccList = new ArrayList<Map>();
    itemMap = new HashMap();
    itemMap.put("id", 1);
    itemMap.put("category", "苹果");
    itemMap.put("sub_category", "红富士苹果");
    bccList.add(itemMap);
    itemMap = new HashMap();
    itemMap.put("id", 2);
    itemMap.put("category", "苹果");
    itemMap.put("sub_category", "国光苹果");
    bccList.add(itemMap);
    map.put("bccList", bccList);

    //供货商
    List<Map> merchantSupplierList = new ArrayList<Map>();
    itemMap = new HashMap();
    itemMap.put("id", 1);
    itemMap.put("supplierName", "李四");
    itemMap.put("supplierShopName", "李四水果店");
    merchantSupplierList.add(itemMap);
    itemMap = new HashMap();
    itemMap.put("id", 2);
    itemMap.put("supplierName", "王五");
    itemMap.put("supplierShopName", "王五蔬菜店");
    merchantSupplierList.add(itemMap);
    map.put("merchantSupplierList", merchantSupplierList);

    //省市区
    List<Map> areaList = new ArrayList<Map>();
    itemMap = new HashMap();
    itemMap.put("sheng_id", 610000);
    itemMap.put("sheng_name", "陕西省");
    itemMap.put("shi_id", 610100);
    itemMap.put("shi_name", "西安市");
    itemMap.put("qu_id", 610104);
    itemMap.put("qu_name", "莲湖区");
    areaList.add(itemMap);
    itemMap = new HashMap();
    itemMap.put("sheng_id", 610000);
    itemMap.put("sheng_name", "陕西省");
    itemMap.put("shi_id", 610100);
    itemMap.put("shi_name", "西安市");
    itemMap.put("qu_id", 610113);
    itemMap.put("qu_name", "雁塔区");
    areaList.add(itemMap);
    map.put("areaList", areaList);
    ExcelTemplate.exportExcelByTemplate(request, response, map, "excelTemplate/template.xls");
}

 3、导出成功后结果如图：