Directorio de artículos
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>
```# 表结构
```java
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`)
);
Algunos datos se importaron anteriormente al artículo cargado, por lo que ahora hay datos en la tabla y se pueden exportar directamente.
Estructura del proyecto
Exportar clase de plantilla
@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;
}
Controlador
@RestController
@RequestMapping("/easyExcel")
public class EasyExcelController {
@Resource
private IStudentService studentService;
@PostMapping("/studentExport")
public void studentExport(HttpServletResponse response){
studentService.studentExport(response);
}
}
Servicio
public interface IStudentService extends IService<Student> {
void studentExport(HttpServletResponse response);
}
ServicioImpl
@Service
public class StudentServiceImpl extends ServiceImpl<StudentMapper, Student> implements IStudentService {
@Resource
private StudentMapper studentMapper;
@Override
public void studentExport(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();
List<Student> studentList = studentMapper.selectList(null);
excelWriter.write(studentList,studentInfo);
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();
}
}
}
mapeador
public interface StudentMapper extends BaseMapper<Student> {
}
Proyecto de inicio
prueba de cartero
Exportación exitosa