1.引入Maven依赖

<!--easypoi依赖（表格导入导出）-->
<dependency>
	<groupId>cn.afterturn</groupId>
	<artifactId>easypoi-spring-boot-starter</artifactId>
	<version>4.3.0</version>
</dependency>

2.实体类属性加上@Excel注解

需要导出的属性才加上@Excel注解，不加注解的属性不会导出

package com.test.entity;

import java.util.Date;

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

/**
 * 测试实体
 */
@Data
public class ExcelVO {

	/**
	 * 主键ID
	 */
	private String id;
    /**
     * 用户名
     */
	@Excel(name = "用户名", orderNum = "1", width = 10)
    private String name;
	/**
	 * 年龄
	 */
	@Excel(name = "年龄", orderNum = "2", type = 10, width = 10)
	private Integer age;
	/**
	 * 性别: 1.男 2.女
	 */
	@Excel(name = "性别", orderNum = "3", replace = {"男_1", "女_2"}, width = 10)
	private Integer sex;
	/**
     * 备注
     */
	@Excel(name = "备注", orderNum = "4", width = 20)
    private String remark;
	/**
	 * 创建时间
	 */
	@Excel(name = "创建时间", orderNum = "5", width = 20, exportFormat = "yyyy-MM-dd HH:mm:ss")
	private Date createTime;

}

3.导出示例

建议用浏览器测试，如果用postman导出execl文件名会为response.xls，是正常的

postman导出execl文件名为response.xls问题_涛哥是个大帅比的博客-CSDN博客

package com.test.controller;

import java.io.OutputStream;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.test.entity.ExcelVO;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;

/**
 * excel导出测试
 */
@RestController
@RequestMapping("/excel")
public class ExcelController {

    @RequestMapping(value = "/export", method = RequestMethod.GET)
    public void export(HttpServletResponse response) {
    	/*
    	 * 测试数据
    	 */
    	List<ExcelVO> list = new ArrayList<ExcelVO>();
    	for (int i = 0; i < 10; i++) {
    		ExcelVO excelVO = new ExcelVO();
    		excelVO.setName("张三-"+i);
    		excelVO.setSex(i%2==0?1:2);
    		excelVO.setAge(i+10);
    		excelVO.setRemark("备注-"+i);
    		excelVO.setCreateTime(new Date());
    		list.add(excelVO);
		}
    	
    	try {
    		
			//导出
			String fileName = "用户列表";
			/*
			 * @param title	标题名称，表格第一行会多一行标题，不需要设置为null
			 * @param sheetName	sheet页的名称
			 */
			ExportParams exportParams = new ExportParams(null, fileName);
			/*
		     * @param entity    表格标题属性
		     * @param pojoClass Excel对象Class
		     * @param dataSet   Excel对象数据List
		     */
			Workbook workbook = ExcelExportUtil.exportExcel(exportParams, ExcelVO.class, list);
			
			//当前时间作为文件名
			Calendar calendar = Calendar.getInstance();
			SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
			String nowDate = sdf.format(calendar.getTime());
			fileName += nowDate;
			
			// 设置输出的格式
			response.setCharacterEncoding("UTF-8");
			response.addHeader("content-type", "application/vnd.ms-excel");
			response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xls");	// 设置下载后的文件名
			OutputStream os = response.getOutputStream();
			workbook.write(os);
			
			//关闭流
			os.flush();
			os.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
    }
    
    
}

4.导出结果

5.注解@Excel说明

名称	说明
exportFormat	导出的时间格式，示例：exportFormat = "yyyy-MM-dd HH:mm:ss"
isWrap	是否换行即支持\n，默认true
name	列名
orderNum	排序，升序方式
replace	值替换格式{a_id,b_id}，示例：replace = {"男_1", "女_2"}
type	导出类型 1 是文本 2 是图片,3 是函数,10 是数字默认是文本
width	每个列的宽单位为字符，一个汉字=2个字符，限制1-255
isColumnHidden	是否需要隐藏该列默认false