SpringBoot结合easypoi.excel，实现数据导出Excel

大多数业务项目中必然会遇到的一个需求，导出数据文件---Excel。

这里简单贴一下自己开发使用的方式方法，抛砖引玉。

也可小白直接大胆食用。

功能Maven依赖：

XML 复制代码

<dependency>
   <groupId>cn.afterturn</groupId>
   <artifactId>easypoi-base</artifactId>
   <version>4.5.0</version>
</dependency>
<dependency>
   <groupId>cn.afterturn</groupId>
   <artifactId>easypoi-web</artifactId>
   <version>4.5.0</version>
</dependency>
<dependency>
   <groupId>cn.afterturn</groupId>
   <artifactId>easypoi-annotation</artifactId>
    <version>4.5.0</version>
</dependency>

业务入口controller，这里很简单

java 复制代码

@GetMapping("/exportApply")
    public void exportApply(BusBasicFlowQuery query, HttpServletResponse response,
                            @RequestHeader(required = false) String lang) throws IOException {
        query.setSize(20000);
        // query:这里就是个查询条件，根据个人业务实操就行
        // 这里就是根据业务需求查询出想要导出的数据集合信息
        // 重点说明一下：Bd3OrderExcel里面包好你要导出的表格列说明
        List<Bd3OrderExcel> bd3OrderExcelList = busBasicFlowService.exportApply(query, lang);
        ExportParams exportParams = new ExportParams();
        ExcelUtils.exportExcel(response, "北三卡申请", bd3OrderExcelList, Bd3OrderExcel.class, exportParams);
    }

重点说明一下Bd3OrderExcel，这个类注明的导出表格字段名称、顺序，宽度等。

java 复制代码

package com.rdss.bus.model.excel;

import cn.afterturn.easypoi.excel.annotation.Excel;
import lombok.Data;

import java.time.LocalDateTime;

@Data
public class Bd3OrderExcel {

    private Integer id;

    /**
     * 申请人身份证号
     */
    @Excel(name = "申请人姓名",width = 30.0)
    private String operatorName;
    /**
     * 申请时间
     */
    @Excel(name = "申请时间",format = "yyyy-MM-dd HH:mm:ss", databaseFormat="yyyy-MM-dd HH:mm:ss" ,width = 30.0)
    private LocalDateTime applyTime;
    /**
     * 申请原因
     */
    @Excel(name = "申请原因",width = 20.0)
    private String remark;
    /**
     * 申请人手机号
     */
    @Excel(name = "申请人手机号",width = 20.0)
    private String operatorMobile;
    /**
     * 申请人身份证号
     */
    @Excel(name = "申请人身份证号",width = 30.0)
    private String operatorIdcardNum;
    /**
     * 申请人邮箱
     */
    @Excel(name = "申请人邮箱",width = 30.0)
    private String operatorEmail;
    /**
     * 申请人机构
     */
    @Excel(name = "申请人机构",width = 30.0)
    private String operatorOrgName;

    /**
     * 审批结果（0-审核中，1-通过，2-不通过
     */
    @Excel(name = "一级审批状态",dict = "approval_result",width = 15.0)
    private String approveResult_first;

    /**
     * 审批人姓名
     */
    @Excel(name = "一级审批人姓名",width = 30.0)
    private String approveUserName_first;
}

导出封装工具类：

java 复制代码

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import com.rdss.bus.service.handler.DictHandler;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * excel工具类
 */
@Slf4j
public class ExcelUtils {
    private ExcelUtils(){}

    @Autowired
    private static DictHandler dictHandler;
    /**
     * Excel导出
     *
     * @param response      response
     * @param fileName      文件名
     * @param list          数据List
     * @param pojoClass     对象Class
     */
    public static void exportExcel(HttpServletResponse response, String fileName, Collection<?> list, Class<?> pojoClass, ExportParams exportParams ) throws IOException {
        exportParams.setStyle(ExcelStyleUtil.class);
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        response.setCharacterEncoding("UTF-8");
        response.setHeader("content-Type", "application/vnd.ms-excel");
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xls");
        ServletOutputStream out = response.getOutputStream();
        workbook.write(out);
        out.flush();
    }

    /**
     * Excel导出，先sourceList转换成List<targetClass>，再导出
     *
     * @param response      response
     * @param fileName      文件名
     * @param sourceList    原数据List
     * @param targetClass   目标对象Class
     */
    public static void exportExcelToTarget(HttpServletResponse response, String fileName, Collection<?> sourceList,
                                     Class<?> targetClass) throws IllegalAccessException, InstantiationException, IOException {
        List<Object> targetList = new ArrayList<>(sourceList.size());
        for(Object source : sourceList){
            Object target = targetClass.newInstance();
            BeanUtils.copyProperties(source, target);
            targetList.add(target);
        }

        exportExcel(response, fileName, targetList, targetClass, new ExportParams());
    }
}