EasyPOI说明：

EasyPoi的功能如同名字easy，主打的功能就是容易，让一个没见接触过poi的人员，就可以方便地写出Excel导出，Excel模板导出，Excel导入，Word模板导出，通过简单的注解和模板，语言(熟悉的表达式语法)，完成以前复杂的写法。

gitee easypoi 地址(这个算是官网)：https://gitee.com/lemur/easypoi，gitee easypoi演示项目，可以用来测试：https://gitee.com/lemur/easypoi-test。

代码案例：

<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-spring-boot-starter</artifactId>
    <version>4.2.0</version>
</dependency>

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import lombok.Data;
import org.apache.poi.ss.usermodel.Workbook;

import java.io.FileOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

@Data
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    @Excel(name = "id", width = 15)
    private int id;

    @Excel(name = "姓名", orderNum = "0", width = 30)
    private String name;

    @Excel(name = "年龄", width = 30)
    private int age;

    @Excel(name = "描述", width = 100)
    private String desc;

    public static void main(String[] args) throws Exception {
        List<User> userList = new ArrayList<>();
        // ===============================================================//
        // 组装数据
        // ===============================================================//
        User user = new User();
        user.setId(10);
        user.setName("张三");
        user.setAge(25);
        user.setDesc("");
        User user1 = new User();
        user1.setId(11);
        user1.setName("李四");
        user1.setAge(26);
        user1.setDesc("");
        User user2 = new User();
        user2.setId(12);
        user2.setName("王五");
        user2.setAge(27);
        user2.setDesc("");
        userList.add(user);
        userList.add(user1);
        userList.add(user2);
        // ===============================================================//
        // 导出Excel
        // ===============================================================//
        String title = "Easypoi导出功能";
        String sheetName = "导出sheet1";
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(true);
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, User.class, userList);
        workbook.write(new FileOutputStream("d://测试user.xls"));
    }

}

导出效果：

工具类参考：

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 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.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;


public class ExtUtils {

    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<Map<String, Object>> 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) {
            return;
        }
        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) {
            // throw new NormalException(e.getMessage());
        }
    }

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        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) {
        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 NormalException("模板不能为空");
        } catch (Exception e) {
            e.printStackTrace();
            // throw new NormalException(e.getMessage());
        }
        return list;
    }

    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows,
                                          Class<T> pojoClass) {
        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 NormalException("excel文件不能为空");
        } catch (Exception e) {
            // throw new NormalException(e.getMessage());
            System.out.println(e.getMessage());
        }
        return list;
    }

}