EasyExcel implementa la exportación de archivos de varias hojas

FácilExcel

EasyExcel es una herramienta de procesamiento de Excel rápida y concisa basada en Java que resuelve el desbordamiento de memoria de archivos grandes.
Le permite completar rápidamente la lectura, escritura y otras funciones de Excel sin considerar el rendimiento, la memoria y otros factores.

Introducir dependencias

 	<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>easyexcel</artifactId>
        <version>3.1.3</version> 
    </dependency>

Estructura de la tabla

mesa de estudiantes

CREATE TABLE `student`  (
  `id` bigint UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '学生表ID',
  `sname` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '学生姓名',
  `sno` bigint NOT NULL COMMENT '学号',
  `sex` char(2) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '性别',
  `age` int NOT NULL COMMENT '年龄',
  `is_deleted` tinyint UNSIGNED NOT NULL DEFAULT 0 COMMENT '是否删除',
  PRIMARY KEY (`id`)
);

Horario de clase

CREATE TABLE `course`  (
  `id` bigint UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '课程表ID',
  `cname` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '课程名',
  `cno` bigint NOT NULL COMMENT '课程号',
  `tno` bigint NOT NULL COMMENT '任教教师编码',
  `is_deleted` tinyint(1) UNSIGNED NOT NULL DEFAULT 0 COMMENT '是否删除',
  PRIMARY KEY (`id`)
);

lista de profesores

CREATE TABLE `teacher`  (
  `id` bigint UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '教师表ID',
  `tname` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '教师姓名',
  `tno` bigint NOT NULL COMMENT '教师编号',
  `sex` char(2) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '性别',
  `age` int NOT NULL COMMENT '年龄',
  `is_deleted` tinyint(1) UNSIGNED NOT NULL DEFAULT 0 COMMENT '是否删除',
  PRIMARY KEY (`id`)
);

Parte de los datos se cargaron al cargar varias hojas, por lo que actualmente hay datos en la tabla.

Estructura del proyecto

Descargar plantilla de clase de entidad

estudiantevo

@Data
public class StudentVo {
    
    

    /**学生姓名**/
    @ExcelProperty(value = "姓名",index = 0)
    private String sname;
    /**学号**/
    @ExcelProperty(value = "学号",index = 1)
    private Long sno;
    /**性别**/
    @ExcelProperty(value = "性别",index = 2)
    private String sex;
    /**年龄**/
    @ExcelProperty(value = "年龄",index = 3)
    private Integer age;

}

CursoVo

@Data
public class CourseVo {
    
    
    /**课程名**/
    @ExcelProperty(value = "课程名",index = 0)
    private String cname;
    /**课程号**/
    @ExcelProperty(value = "课程号",index = 1)
    private Long cno;
    /**任教教师编号**/
    @ExcelProperty(value = "任教教师编号",index = 2)
    private Long tno;
}

profesorvo

@Data
public class TeacherVo {
    
    
    /**教师姓名**/
    @ExcelProperty(value = "姓名", index = 0)
    private String tname;
    /**教师编号**/
    @ExcelProperty(value = "教师编号", index = 1)
    private Long tno;
    /**性别**/
    @ExcelProperty(value = "性别", index = 2)
    private String sex;
    /**年龄**/
    @ExcelProperty(value = "年龄", index = 3)
    private Integer age;
}

Controlador

@RestController
@RequestMapping("/easyExcel")
public class EasyExcelController {
    
    

	@Resource
    private IEasyExcelService easyExcelService;

    @PostMapping("excelExport")
    public void excelExport(HttpServletResponse response){
    
    
        easyExcelService.excelExport(response);
    }
}

Servicio

Servicio EasyExcel

public interface IEasyExcelService {
    
    
    void excelExport(HttpServletResponse response);
}

Servicio Estudiantil

public interface IStudentService extends IService<Student> {
    
    
}

Servicio de curso

public interface ICourseService extends IService<Course> {
    
    
}

Servicio de Maestros

public interface ITeacherService extends IService<Teacher> {
    
    
}

ServicioImpl

EasyExcelServiceImpl

@Service
public class EasyExcelServiceImpl implements IEasyExcelService {
    
    

    @Resource
    private StudentMapper studentMapper;
    @Resource
    private CourseMapper courseMapper;
    @Resource
    private TeacherMapper teacherMapper;

   @Override
    public void excelExport(HttpServletResponse response) {
    
    
        try {
    
    
            String fileName = "student";
            ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream()).build();
            WriteSheet studentInfo = EasyExcel.writerSheet(0,"student")
                    .head(StudentVo.class).registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())
                    .build();
            WriteSheet courseInfo = EasyExcel.writerSheet(1,"course")
                    .head(CourseVo.class).registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())
                    .build();
            WriteSheet teacherInfo = EasyExcel.writerSheet(2,"teacher")
                    .head(TeacherVo.class).registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())
                    .build();

            List<Student> studentList = studentMapper.selectList(null);
            List<Course> courseList = courseMapper.selectList(null);
            List<Teacher> teacherList = teacherMapper.selectList(null);
            excelWriter.write(studentList,studentInfo);
            excelWriter.write(courseList,courseInfo);
            excelWriter.write(teacherList,teacherInfo);
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            response.setCharacterEncoding("UTF-8");
            response.setHeader("Content-Disposition","attachment;filename="+fileName+".xlsx");
            excelWriter.finish();
        }catch (IOException e){
    
    
            e.printStackTrace();
        }
    }

EstudianteServicioImpl

@Service
public class StudentServiceImpl extends ServiceImpl<StudentMapper, Student> implements IStudentService {
    
    
}

CursoServicioImpl

@Service
public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course> implements ICourseService {
    
    
}

MaestroServicioImpl

@Service
public class TeacherServiceImpl extends ServiceImpl<TeacherMapper, Teacher> implements ITeacherService {
    
    
}

mapeador

EstudianteMapeador

public interface StudentMapper extends BaseMapper<Student> {
    
    
}

Mapeador de cursos

public interface CourseMapper extends BaseMapper<Course> {
    
    
}

MaestroMapeador

public interface TeacherMapper extends BaseMapper<Teacher> {
    
    
}

Proyecto de inicio

prueba

Utilice cartero para probar. El método de prueba es el siguiente:


después de la descarga, abra la tabla de Excel para ver el contenido.

Operación completada