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
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<!-- 开发环境版本，包含了有帮助的命令行警告 -->
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<!-- 引入样式 -->
<link
rel="stylesheet"
href="https://unpkg.com/element-ui/lib/theme-chalk/index.css" rel="external nofollow"
/>
<!-- 引入组件库 -->
<script src="https://unpkg.com/element-ui/lib/index.js"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
</head>
<body>
<div id="app">
<div class="app-container">
<div style="margin-bottom: 10px">
<el-button
@click="dialogVisible = true"
type="primary"
size="mini"
icon="el-icon-download"
>
导入Excel
</el-button>
<el-dialog
title="数据字典导入"
:visible.sync="dialogVisible"
width="30%"
>
<el-form>
<el-form-item label="请选择Excel文件">
<el-upload
:auto-upload="true"
:multiple="false"
:limit="1"
:on-exceed="fileUploadExceed"
:on-success="fileUploadSuccess"
:on-error="fileUploadError"
:action="importUrl"
name="file"
accept="application/vnd.ms-excel,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
>
<!--accept 只接受某种格式的文件-->
<el-button size="small" type="primary">点击上传</el-button>
</el-upload>
</el-form-item>
</el-form>
<div slot="footer" class="dialog-footer">
<el-button @click="dialogVisible = false">取消</el-button>
</div>
</el-dialog>
<!-- 导出 -->
<el-button
@click="exportData"
type="primary"
size="mini"
icon="el-icon-upload2"
>
导出Excel
</el-button>
<!-- 数据展示 -->
<el-table :data="list" stripe style="width: 100%">
<el-table-column prop="name" label="姓名" width="180">
</el-table-column>
<el-table-column prop="birthday" label="生日" width="180">
</el-table-column>
<el-table-column prop="salary" label="薪资"> </el-table-column>
</el-table>
<div>
<el-pagination
@size-change="handleSizeChange"
@current-change="handleCurrentChange"
:current-page="pageNum"
:page-sizes="[2, 5, 10, 20]"
:page-size="pageSize"
background
layout="total, sizes, prev, pager, next, jumper"
:total="total"
>
</el-pagination>
</div>
</div>
</div>
</div>
</body>
<script>
new Vue({
el: '#app',
data() {
return {
dialogVisible: false, //文件上传对话框是否显示
list: [], // 字典的数据
importUrl: 'http://localhost:8811/api/excel/import',
pageNum: 1, // 页数
pageSize: 5, // 每页条数
total: 1000,
}
},
created() {
this.showList()
},
methods: {
showList() {
//使用自定义配置
const request = axios.create({
baseURL: 'http://localhost:8811', //url前缀
timeout: 1000, //超时时间
// headers: { token: 'helen123456' }, //携带令牌
})
request
.get('/api/excel/list', {
params: {
pageNum: this.pageNum,
pageSize: this.pageSize,
},
})
.then((res) => {
this.total = res.data.size
this.list = res.data.list
console.log(res)
})
},
// 上传多于一个文件时
fileUploadExceed() {
this.$message.warning('只能选取一个文件')
},
// 导出
exportData() {
window.location.href = 'http://localhost:8811/api/excel/export'
},
//上传成功回调
fileUploadSuccess(response) {
if (response.code === 0) {
this.$message.success('数据导入成功')
this.dialogVisible = false
} else {
this.$message.error(response.message)
}
},
//上传失败回调
fileUploadError(error) {
this.$message.error('数据导入失败')
},
handleSizeChange(val) {
console.log(`每页 ${val} 条`)
this.pageSize = val
this.showList()
},
handleCurrentChange(val) {
console.log(`当前页: ${val}`)
this.pageNum = val
this.showList()
},
},
})
</script>
</html>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<String, Object> list(@RequestParam int pageNum,@RequestParam int pageSize){
// 分页查询
Page<Student> page = new Page<>(pageNum, pageSize);
studentMapper.selectPage(page,null);
// 封装数据
HashMap<String, Object> map = new HashMap<>();
ArrayList<ExcelStudentDTO> 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;
}
@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";
}
@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<Student> {
void insertBatch(List<ExcelStudentDTO> list);
}StudentMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="look.word.mapper.StudentMapper">
<insert id="insertBatch" >
insert into student(name, birthday, salary)
values
<foreach collection="list" item="item" separator=",">
(
#{item.name} ,
#{item.birthday} ,
#{item.salary}
)
</foreach>
</insert>
</mapper>3.3 bean
ExcelStudentDTO
导入数据时 要保证excel中列名和ExcelStudentDTO一致奥
@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
@Data
@TableName(value = "student")
public class Student {
@TableField(value = "name")
private String name;
@TableField(value = "birthday")
private Date birthday;
@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
@Slf4j
//@AllArgsConstructor //全参
@NoArgsConstructor //无参
public class ExcelDictDTOListener extends AnalysisEventListener<ExcelStudentDTO> {
private static final int BATCH_COUNT = 5;
List<ExcelStudentDTO> list = new ArrayList<ExcelStudentDTO>();
private StudentMapper studentMapper;
//传入mapper对象
public ExcelDictDTOListener(StudentMapper studentMapper) {
this.studentMapper = studentMapper;
}
@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();
}
}
@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！");
}
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 {
@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/*.xml4.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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