前言
创建一个普通的maven项目即可
项目目录结构
1.前端
存放在resources/static 下
index.html
Document
导入Excel
点击上传
导出Excel
2.数据库
CREATE TABLE `student` ( `name` varchar(255) DEFAULT NULL COMMENT '姓名', `birthday` datetime DEFAULT NULL COMMENT '生日', `salary` decimal(10,4) DEFAULT NULL COMMENT '薪资' ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
3.后端
3.1 contrller
StudentController
@Slf4j
@RestController
@CrossOrigin
@RequestMapping("/api/excel/")
public class StudentController {
@Resource
private StudentMapper studentMapper;
@GetMapping("list")
public HashMap list(@RequestParam int pageNum,@RequestParam int pageSize){
// 分页查询
Page page = new Page<>(pageNum, pageSize);
studentMapper.selectPage(page,null);
// 封装数据
HashMap map = new HashMap<>();
ArrayList excelDictDTOList = new ArrayList<>();
// 转换数据
page.getRecords().forEach(student -> {
ExcelStudentDTO studentDTO = new ExcelStudentDTO();
BeanUtils.copyProperties(student,studentDTO);
excelDictDTOList.add(studentDTO);
});
map.put("list",excelDictDTOList);
map.put("size",page.getTotal());
return map;
}
/**
* 导入
* @param file 文件对象
*/
@RequestMapping("import")
@Transactional(rollbackFor = {Exception.class})
public String importData( @RequestParam("file") MultipartFile file){
try {
// 读取文件流
EasyExcel.read
(file.getInputStream(),// 前端上传的文件
ExcelStudentDTO.class,// 跟excel对应的实体类
new ExcelDictDTOListener(studentMapper))// 监听器
.excelType(ExcelTypeEnum.XLSX)// excel的类型
.sheet("模板").doRead();
log.info("importData finished");
} catch (IOException e) {
log.info("失败");
e.printStackTrace();
}
return "上传成功";
}
/**
* 导入
*/
@GetMapping("export")
public String exportData(HttpServletResponse response){
try {
// 设置响应体内容
response.setContentType("application/vnd.ms-excel");
response.setCharacterEncoding("utf-8");
// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
String fileName = URLEncoder.encode("myStu", "UTF-8").replaceAll("\\+", "%20");
response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");
EasyExcel.write(response.getOutputStream()
,ExcelStudentDTO.class).sheet().doWrite(studentMapper.selectList(null));
} catch (Exception e) {
e.printStackTrace();
}
return "上传成功";
}
}
3.2 mapper
StudentMapper
@Mapper public interface StudentMapper extends BaseMapper{ void insertBatch(List list); }
StudentMapper.xml
insert into student(name, birthday, salary) values ( #{item.name} , #{item.birthday} , #{item.salary} )
3.3 bean
ExcelStudentDTO
导入数据时 要保证excel中列名和ExcelStudentDTO一致奥
/**
* excel对应的实体类
* @author jiejie
*/
@Data
public class ExcelStudentDTO {
// excel中的列名
@ExcelProperty("姓名")
private String name;
@ExcelProperty("生日")
private Date birthday;
@ExcelProperty("薪资")
private BigDecimal salary;
}
Student
/**
* 数据库对应的实体类
* @author jiejie
*/
@Data
@TableName(value = "student")
public class Student {
/**
* 姓名
*/
@TableField(value = "name")
private String name;
/**
* 生日
*/
@TableField(value = "birthday")
private Date birthday;
/**
* 薪资
*/
@TableField(value = "salary")
private BigDecimal salary;
public static final String COL_NAME = "name";
public static final String COL_BIRTHDAY = "birthday";
public static final String COL_SALARY = "salary";
}
3.4 listener
官方文档
EasyExcel读取文件需要用到
ExcelDictDTOListener
/** * 监听 * 再读取数据的同时 对数据进行插入操作 * @author : look-word * @date : 2022-05-10 21:35 **/ @Slf4j //@AllArgsConstructor //全参 @NoArgsConstructor //无参 public class ExcelDictDTOListener extends AnalysisEventListener{ /** * 每隔5条存储数据库，实际使用中可以3000条，然后清理list ，方便内存回收 */ private static final int BATCH_COUNT = 5; List list = new ArrayList (); private StudentMapper studentMapper; //传入mapper对象 public ExcelDictDTOListener(StudentMapper studentMapper) { this.studentMapper = studentMapper; } /** *遍历每一行的记录 * @param data * @param context */ @Override public void invoke(ExcelStudentDTO data, AnalysisContext context) { log.info("解析到一条记录: {}", data); list.add(data); // 达到BATCH_COUNT了，需要去存储一次数据库，防止数据几万条数据在内存，容易OOM if (list.size() >= BATCH_COUNT) { saveData(); // 存储完成清理 list list.clear(); } } /** * 所有数据解析完成了 都会来调用 */ @Override public void doAfterAllAnalysed(AnalysisContext context) { // 这里也要保存数据，确保最后遗留的数据也存储到数据库 saveData(); log.info("所有数据解析完成！"); } /** * 加上存储数据库 */ private void saveData() { log.info("{}条数据，开始存储数据库！", list.size()); studentMapper.insertBatch(list); //批量插入 log.info("存储数据库成功！"); } }
3.5 config
mybatisPlus分页插件
MybatisPlusConfig
@Configuration
public class MybatisPlusConfig {
/**
* 新的分页插件,一缓和二缓遵循mybatis的规则,
* 需要设置 MybatisConfiguration#useDeprecatedExecutor = false
* 避免缓存出现问题(该属性会在旧插件移除后一同移除)
*/
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
PaginationInnerInterceptor paginationInnerInterceptor = new PaginationInnerInterceptor();
paginationInnerInterceptor.setDbType(DbType.MYSQL);
paginationInnerInterceptor.setOverflow(true);
interceptor.addInnerInterceptor(paginationInnerInterceptor);
return interceptor;
}
@Bean
public ConfigurationCustomizer configurationCustomizer() {
return configuration -> configuration.setUseDeprecatedExecutor(false);
}
}
3.6 配置文件
application.yaml
server:
port: 8811
spring:
datasource: # mysql数据库连接
type: com.zaxxer.hikari.HikariDataSource
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/2022_source_springboot?serverTimezone=GMT%2B8&characterEncoding=utf-8
username: root
password: 317311
mybatis-plus:
configuration:# sql日志
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
mapper-locations:
- classpath:mapper/*.xml
4.启动测试
启动springboot哦
页面效果图
导出效果
注意
导入数据时要保证excel中列名和ExcelStudentDTO一致奥
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