springboot+easypoi搞定Excel导入导出

这是个开源的工具，只需要一行代码就可以搞定数据导入导出，而不用自己去写大量的工具类。 官网教程

pom.xml:

            cn.afterturn
            easypoi-base
            3.0.3
        
        
            cn.afterturn
            easypoi-web
            3.0.3
        
        
            cn.afterturn
            easypoi-annotation
            3.0.3
        

DAO类：

package com.lingfei.admin.entity;

import cn.afterturn.easypoi.excel.annotation.Excel;
import com.gitee.sunchenbin.mybatis.actable.annotation.Column;
import com.gitee.sunchenbin.mybatis.actable.annotation.Table;
import com.gitee.sunchenbin.mybatis.actable.command.BaseModel;
import com.gitee.sunchenbin.mybatis.actable.constants.MySqlTypeConstant;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.sql.Timestamp;
import java.util.Date;

/**
 * @author 熊义杰
 * @date 2019-3-17
 */

@Data
@AllArgsConstructor
@NoArgsConstructor
@Table(name = "announce")
public class Announce extends BaseModel {

    @Excel(name = "序号", orderNum = "0")
    @Column(name = "id",type = MySqlTypeConstant.INT, length = 10,isKey = true,isAutoIncrement = true)
    private int id;

    @Excel(name = "内容", orderNum = "1")
    @Column(name = "content",type = MySqlTypeConstant.VARCHAR,length = 400)
    private String content;

    @Excel(name = "时间", exportFormat = "yyyy-MM-dd hh:mm" ,orderNum = "2")
    @Column(name = "date",type = MySqlTypeConstant.DATETIME)
    private Timestamp date;
}

我这里使用了大量的注解，自动创建getter和setter的注解，还有自动创建表的注解

工具类：

package com.lingfei.admin.utils;

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.enmus.ExcelType;
import com.sun.deploy.net.URLEncoder;
import org.apache.commons.lang.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.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

/**
 * @author www.xyjz123.xyz
 * @date 2019/3/18 18:09
 */
public class ExcelUtils {

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

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

        }
        downLoadExcel(fileName, response, workbook);
    }

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

    public static  List importExcel(String filePath,Integer titleRows,Integer headerRows, Class pojoClass){
        if (StringUtils.isBlank(filePath)){
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        }catch (NoSuchElementException e){
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
            e.printStackTrace();
        }
        return list;
    }
    public static  List importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class pojoClass){
        if (file == null){
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        }catch (NoSuchElementException e){
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }
}

上面一些工具是用不到的，可以自己选择使用。

control类：

package com.lingfei.admin.control;

import com.lingfei.admin.entity.Announce;
import com.lingfei.admin.service.impl.AnnounceServiceImpl;
import com.lingfei.admin.utils.ExcelUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

import javax.servlet.http.HttpServletResponse;
import java.util.List;

/**
 * @author www.xyjz123.xyz
 * @date 2019/3/18 18:25
 */

@Controller
public class AdminExcelControl {

    @Autowired
    AnnounceServiceImpl announceService;

    @GetMapping("/getExcel")
    public void export(HttpServletResponse response){
        List announces = announceService.getAllResult();
        //导出到Excel
        ExcelUtils.exportExcel(announces,"公告记录","jie",Announce.class,"测试.xls",response);
    }
}

然后在前端加个连接或者直接浏览器调用接口就可以导出了。