使用EasyExcel进行导出文件

1.创建SpringBoot项目，导入依赖

<parent>
        <artifactId>spring-boot-starter-parent</artifactId>
        <groupId>org.springframework.boot</groupId>
        <version>2.7.6</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>3.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.7.6</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.1.3</version>
        </dependency>
    </dependencies>

2.创建一个所需实体类，例如User

@TableName("user")
@Data
public class User implements Serializable {

    @ExcelProperty("主键")
    private int id;

    @ExcelProperty("姓名")
    private String name;

    @ExcelProperty("性别")
    private String sex;

    @ExcelProperty("年龄")
    private String age;

    @ExcelProperty("账号")
    private String userName;

    @ExcelProperty("密码")
    private String passWord;
    
    @ExcelProperty("邮箱")
    private String email;
}

3.创建启动器和resource资源文件

//启动器
@SpringBootApplication
public class testApplication {
    public static void main(String[] args) {
        SpringApplication.run(testApplication.class, args);
    }
}

//配置文件
server.port=8081

4.创建一个测试Controller

@RestController
@RequestMapping("test")
public class testController {

    @GetMapping("/exportExcel")
    public void exportTable(HttpServletResponse response) throws IOException {

        List<User> list = new ArrayList<>();
        for (int i = 0; i < 3; i++) {
            User user = new User();
            user.setId(1);
            user.setName("张三");
            user.setAge("21");
            list.add(user);
        }

        response.setContentType("application/vnd.ms-excel");
        response.setHeader("content-disposition", "attachment;fileName=eventList.xlsx");
        ExcelWriterBuilder builder = EasyExcel.write(response.getOutputStream(), userDto.class);
        ExcelWriterSheetBuilder sheet = builder.sheet();
        ArrayList<userDto> dtos = new ArrayList<>();
        for (User user : list) {
            userDto dto = new userDto();
            BeanUtils.copyProperties(user, dto);
            dtos.add(dto);
        }
        sheet.doWrite(dtos);
    }
}

5.启动项目，页面上访问路径即可

 

也可参考   https://www.jianshu.com/p/8f3defdc76d4