VUE脚手架+easypoi 完成Excel导出功能

后台java：

/**
     * Easypoi导出Excel
     * @param umsOrderStatisticsVo
     * @param response
     * @return
     * @throws Exception
     */
    @ApiOperation("Easypoi导出Excel")
    @RequestMapping(value = "/exportOrderStatistics",method = RequestMethod.POST)
    @ResponseBody
    public CommonResult exportOrderStatistics(UmsOrderStatisticsVo umsOrderStatisticsVo,HttpServletResponse response) throws Exception{
        //从数据库获取需要导出的数据
        List<UmsOrderStatisticsVo> umsOrderStatisticsList = umsOrderStatisticsService.queryOrderStatistics(umsOrderStatisticsVo);
        ExportParams ex = new ExportParams("订单明细信息", "订单明细信息");
        Workbook workbook = ExcelExportUtil.exportExcel(ex,UmsOrderStatisticsVo.class,umsOrderStatisticsList);
        try {
            FileOutputStream fos = new FileOutputStream(ExcelUtil.getAbsoluteFile("订单明细信息"));
            workbook.write(fos);
            workbook.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return CommonResult.success("订单明细信息");
    }

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     * @param delete 是否删除
     */
    @ApiOperation("Easypoi导出Excel")
    @RequestMapping(value = "/exportOrderStatistics2",method = RequestMethod.GET)
    @ResponseBody
    public void fileDownload(@RequestParam("fileName") String fileName,@RequestParam("delete") Boolean delete, HttpServletResponse response, HttpServletRequest request)
    {
        try
        {
            if (!FileUtils.isValidFilename(fileName))
            {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = "D://" + fileName;

            response.setCharacterEncoding("utf-8");
            response.setContentType("multipart/form-data");
            response.setHeader("Content-Disposition",
                    "attachment;fileName=" + FileUtils.setFileDownloadHeader(request, realFileName)+".xls");
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete)
            {
                FileUtils.deleteFile(filePath);
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

ExcelUtils：

package com.dmd.admin.utils;

/**
 * @author ChenYanbing
 * @title: ExcelUtil
 * @projectName dmd
 * @description: TODO
 * @date 2019/11/2516:16
 */


import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.TemplateExportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

public class ExcelUtil {
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) throws Exception {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);

    }
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,String fileName, HttpServletResponse response) throws Exception {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
    }


    public static void exportExcel(List<?> list, ExportParams exportParams, Class<?> pojoClass,String fileName, HttpServletResponse response) throws Exception {
        defaultExport(list, pojoClass, fileName, response, exportParams);
    }
    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws Exception {
        defaultExport(list, fileName, response);
    }

    public static void exportExcel(Workbook workbook,String fileName,HttpServletResponse response) throws Exception {
        if (workbook != null) {
            downLoadExcel(fileName, response, workbook);
        }
    }

    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) throws Exception {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        if (workbook != null) {
            downLoadExcel(fileName, response, workbook);
        }
    }

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws Exception{
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));

            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            throw new Exception(e.getMessage());
        }
    }

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws Exception {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null){
            downLoadExcel(fileName, response, workbook);
        }
    }

    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass)throws Exception {
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new Exception("模板不能为空");
        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception(e.getMessage());
        }
        return list;
    }

    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws Exception {
        if (file == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new Exception("excel文件不能为空");
        } catch (Exception e) {
            throw new Exception(e);
        }

        return list;
    }

    public static void handleExcel(HttpServletResponse response, String fileName, TemplateExportParams params, Map<String, Object> map) {
        Workbook workbook = ExcelExportUtil.exportExcel(params, map);


        if (workbook != null) {
            try {
                response.setCharacterEncoding("UTF-8");
                response.setHeader("content-Type", "application/vnd.ms-excel");
                response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
                workbook.write(response.getOutputStream());
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

/*    public static ArrayList<ExcelExportEntity> getExcelColumnList(List<UmsOrderStatisticsVo> detailList) {
        ArrayList<ExcelExportEntity> columnList = new ArrayList<>();
        if (detailList != null && detailList.size() > 0) {
            for (UmsOrderStatisticsVo firstTempDetail : detailList) {
                //处理自定义表头
                ExcelExportEntity excelExportEntity = new ExcelExportEntity(firstTempDetail.getName(), firstTempDetail.getName());
                List<UmsOrderStatisticsVo> items = (List<UmsOrderStatisticsVo>) firstTempDetail.getBirthday();
                if (items != null && items.size() > 0) {
                    List<ExcelExportEntity> excelExportList = new ArrayList<>();
                    for (Person item : items) {
                        excelExportList.add(new ExcelExportEntity(item.getName(), item.getName()));
                    }
                    excelExportEntity.setList(excelExportList);
                }
                columnList.add(excelExportEntity);
            }
        }
        return columnList;
    }*/

    /**
     * 获取下载路径
     *
     * @param filename 文件名称
     */
    public static String getAbsoluteFile(String filename)
    {
        String downloadPath = "D://" + filename;
        File desc = new File(downloadPath);
        if (!desc.getParentFile().exists())
        {
            desc.getParentFile().mkdirs();
        }
        return downloadPath;
    }
}

StringUtils:

package com.dmd.admin.utils;

import com.xiaoleilu.hutool.lang.StrFormatter;

import java.util.Collection;
import java.util.Map;

/**
 * 字符串工具类
 * 
 * @author ruoyi
 */
public class StringUtils extends org.apache.commons.lang3.StringUtils
{
    /** 空字符串 */
    private static final String NULLSTR = "";

    /** 下划线 */
    private static final char SEPARATOR = '_';

    /**
     * 获取参数不为空值
     * 
     * @param value defaultValue 要判断的value
     * @return value 返回值
     */
    public static <T> T nvl(T value, T defaultValue)
    {
        return value != null ? value : defaultValue;
    }

    /**
     * * 判断一个Collection是否为空， 包含List，Set，Queue
     * 
     * @param coll 要判断的Collection
     * @return true：为空 false：非空
     */
    public static boolean isEmpty(Collection<?> coll)
    {
        return isNull(coll) || coll.isEmpty();
    }

    /**
     * * 判断一个Collection是否非空，包含List，Set，Queue
     * 
     * @param coll 要判断的Collection
     * @return true：非空 false：空
     */
    public static boolean isNotEmpty(Collection<?> coll)
    {
        return !isEmpty(coll);
    }

    /**
     * * 判断一个对象数组是否为空
     * 
     * @param objects 要判断的对象数组
     ** @return true：为空 false：非空
     */
    public static boolean isEmpty(Object[] objects)
    {
        return isNull(objects) || (objects.length == 0);
    }

    /**
     * * 判断一个对象数组是否非空
     * 
     * @param objects 要判断的对象数组
     * @return true：非空 false：空
     */
    public static boolean isNotEmpty(Object[] objects)
    {
        return !isEmpty(objects);
    }

    /**
     * * 判断一个Map是否为空
     * 
     * @param map 要判断的Map
     * @return true：为空 false：非空
     */
    public static boolean isEmpty(Map<?, ?> map)
    {
        return isNull(map) || map.isEmpty();
    }

    /**
     * * 判断一个Map是否为空
     * 
     * @param map 要判断的Map
     * @return true：非空 false：空
     */
    public static boolean isNotEmpty(Map<?, ?> map)
    {
        return !isEmpty(map);
    }

    /**
     * * 判断一个字符串是否为空串
     * 
     * @param str String
     * @return true：为空 false：非空
     */
    public static boolean isEmpty(String str)
    {
        return isNull(str) || NULLSTR.equals(str.trim());
    }

    /**
     * * 判断一个字符串是否为非空串
     * 
     * @param str String
     * @return true：非空串 false：空串
     */
    public static boolean isNotEmpty(String str)
    {
        return !isEmpty(str);
    }

    /**
     * * 判断一个对象是否为空
     * 
     * @param object Object
     * @return true：为空 false：非空
     */
    public static boolean isNull(Object object)
    {
        return object == null;
    }

    /**
     * * 判断一个对象是否非空
     * 
     * @param object Object
     * @return true：非空 false：空
     */
    public static boolean isNotNull(Object object)
    {
        return !isNull(object);
    }

    /**
     * * 判断一个对象是否是数组类型（Java基本型别的数组）
     * 
     * @param object 对象
     * @return true：是数组 false：不是数组
     */
    public static boolean isArray(Object object)
    {
        return isNotNull(object) && object.getClass().isArray();
    }

    /**
     * 去空格
     */
    public static String trim(String str)
    {
        return (str == null ? "" : str.trim());
    }

    /**
     * 截取字符串
     * 
     * @param str 字符串
     * @param start 开始
     * @return 结果
     */
    public static String substring(final String str, int start)
    {
        if (str == null)
        {
            return NULLSTR;
        }

        if (start < 0)
        {
            start = str.length() + start;
        }

        if (start < 0)
        {
            start = 0;
        }
        if (start > str.length())
        {
            return NULLSTR;
        }

        return str.substring(start);
    }

    /**
     * 截取字符串
     * 
     * @param str 字符串
     * @param start 开始
     * @param end 结束
     * @return 结果
     */
    public static String substring(final String str, int start, int end)
    {
        if (str == null)
        {
            return NULLSTR;
        }

        if (end < 0)
        {
            end = str.length() + end;
        }
        if (start < 0)
        {
            start = str.length() + start;
        }

        if (end > str.length())
        {
            end = str.length();
        }

        if (start > end)
        {
            return NULLSTR;
        }

        if (start < 0)
        {
            start = 0;
        }
        if (end < 0)
        {
            end = 0;
        }

        return str.substring(start, end);
    }

    /**
     * 格式化文本, {} 表示占位符<br>
     * 此方法只是简单将占位符 {} 按照顺序替换为参数<br>
     * 如果想输出 {} 使用 \\转义 { 即可，如果想输出 {} 之前的 \ 使用双转义符 \\\\ 即可<br>
     * 例：<br>
     * 通常使用：format("this is {} for {}", "a", "b") -> this is a for b<br>
     * 转义{}： format("this is \\{} for {}", "a", "b") -> this is \{} for a<br>
     * 转义\： format("this is \\\\{} for {}", "a", "b") -> this is \a for b<br>
     * 
     * @param template 文本模板，被替换的部分用 {} 表示
     * @param params 参数值
     * @return 格式化后的文本
     */
    public static String format(String template, Object... params)
    {
        if (isEmpty(params) || isEmpty(template))
        {
            return template;
        }
        return StrFormatter.format(template, params);
    }

    /**
     * 下划线转驼峰命名
     */
    public static String toUnderScoreCase(String str)
    {
        if (str == null)
        {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        // 前置字符是否大写
        boolean preCharIsUpperCase = true;
        // 当前字符是否大写
        boolean curreCharIsUpperCase = true;
        // 下一字符是否大写
        boolean nexteCharIsUpperCase = true;
        for (int i = 0; i < str.length(); i++)
        {
            char c = str.charAt(i);
            if (i > 0)
            {
                preCharIsUpperCase = Character.isUpperCase(str.charAt(i - 1));
            }
            else
            {
                preCharIsUpperCase = false;
            }

            curreCharIsUpperCase = Character.isUpperCase(c);

            if (i < (str.length() - 1))
            {
                nexteCharIsUpperCase = Character.isUpperCase(str.charAt(i + 1));
            }

            if (preCharIsUpperCase && curreCharIsUpperCase && !nexteCharIsUpperCase)
            {
                sb.append(SEPARATOR);
            }
            else if ((i != 0 && !preCharIsUpperCase) && curreCharIsUpperCase)
            {
                sb.append(SEPARATOR);
            }
            sb.append(Character.toLowerCase(c));
        }

        return sb.toString();
    }

    /**
     * 是否包含字符串
     * 
     * @param str 验证字符串
     * @param strs 字符串组
     * @return 包含返回true
     */
    public static boolean inStringIgnoreCase(String str, String... strs)
    {
        if (str != null && strs != null)
        {
            for (String s : strs)
            {
                if (str.equalsIgnoreCase(trim(s)))
                {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 将下划线大写方式命名的字符串转换为驼峰式。如果转换前的下划线大写方式命名的字符串为空，则返回空字符串。 例如：HELLO_WORLD->HelloWorld
     * 
     * @param name 转换前的下划线大写方式命名的字符串
     * @return 转换后的驼峰式命名的字符串
     */
    public static String convertToCamelCase(String name)
    {
        StringBuilder result = new StringBuilder();
        // 快速检查
        if (name == null || name.isEmpty())
        {
            // 没必要转换
            return "";
        }
        else if (!name.contains("_"))
        {
            // 不含下划线，仅将首字母大写
            return name.substring(0, 1).toUpperCase() + name.substring(1);
        }
        // 用下划线将原始字符串分割
        String[] camels = name.split("_");
        for (String camel : camels)
        {
            // 跳过原始字符串中开头、结尾的下换线或双重下划线
            if (camel.isEmpty())
            {
                continue;
            }
            // 首字母大写
            result.append(camel.substring(0, 1).toUpperCase());
            result.append(camel.substring(1).toLowerCase());
        }
        return result.toString();
    }
}

FileUtils:

package com.dmd.admin.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletRequest;

/**
 * 文件处理工具类
 * 
 * @author ruoyi
 */
public class FileUtils
{
    public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";

    /**
     * 输出指定文件的byte数组
     * 
     * @param filePath 文件路径
     * @param os 输出流
     * @return
     */
    public static void writeBytes(String filePath, OutputStream os) throws IOException
    {
        FileInputStream fis = null;
        try
        {
            File file = new File(filePath);
            if (!file.exists())
            {
                throw new FileNotFoundException(filePath);
            }
            fis = new FileInputStream(file);
            byte[] b = new byte[1024];
            int length;
            while ((length = fis.read(b)) > 0)
            {
                os.write(b, 0, length);
            }
        }
        catch (IOException e)
        {
            throw e;
        }
        finally
        {
            if (os != null)
            {
                try
                {
                    os.close();
                }
                catch (IOException e1)
                {
                    e1.printStackTrace();
                }
            }
            if (fis != null)
            {
                try
                {
                    fis.close();
                }
                catch (IOException e1)
                {
                    e1.printStackTrace();
                }
            }
        }
    }

    /**
     * 删除文件
     * 
     * @param filePath 文件
     * @return
     */
    public static boolean deleteFile(String filePath)
    {
        boolean flag = false;
        File file = new File(filePath);
        // 路径为文件且不为空则进行删除
        if (file.isFile() && file.exists())
        {
            file.delete();
            flag = true;
        }
        return flag;
    }

    /**
     * 文件名称验证
     * 
     * @param filename 文件名称
     * @return true 正常 false 非法
     */
    public static boolean isValidFilename(String filename)
    {
        return filename.matches(FILENAME_PATTERN);
    }

    /**
     * 下载文件名重新编码
     * 
     * @param request 请求对象
     * @param fileName 文件名
     * @return 编码后的文件名
     */
    public static String setFileDownloadHeader(HttpServletRequest request, String fileName)
            throws UnsupportedEncodingException
    {
        final String agent = request.getHeader("USER-AGENT");
        String filename = fileName;
        if (agent.contains("MSIE"))
        {
            // IE浏览器
            filename = URLEncoder.encode(filename, "utf-8");
            filename = filename.replace("+", " ");
        }
        else if (agent.contains("Firefox"))
        {
            // 火狐浏览器
            filename = new String(fileName.getBytes(), "ISO8859-1");
        }
        else if (agent.contains("Chrome"))
        {
            // google浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        }
        else
        {
            // 其它浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        }
        return filename;
    }
}

前台：

Button按钮：

      <el-button
        style="float:right;margin-right: 15px"
        type="primary"
        @click="handleExport()"
        size="small">
        数据导出
      </el-button>

方法引入：

  import {exportOrderStatistics,uploadOrderStatistics } from '@/api/orderStatistics';

orderStatistics.js:

export function exportOrderStatistics(params) {
  return request({
    url:'/orderStatistics/exportOrderStatistics',
    method:'post',
    params:params,
  })
}
export function uploadOrderStatistics(params) {
  return request({
    url:'/orderStatistics/exportOrderStatistics2',
    method:'get',
    params:params,
    header: {'Content-Type': 'application/json'},
    responseType: 'arraybuffer'
  })
}

methods:

handleExport(){
        this.getList2();
},
getList2(){
        exportOrderStatistics (this.listQuery).then(response => {
          if (response.code === 200){
            window.location.href = 'http://localhost:8090' + "/orderStatistics/exportOrderStatistics2?fileName=" + encodeURI(response.data) + "&delete=" + true;
          }

        }).catch(err => {
          console.log(err) // 这里catch到错误timeout
        })
      }