创建一个普通的maven项目即可
项目目录结构
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" /> <!-- 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 > <div > <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" > <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 > <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') }, /** * 用户所选择当前页面展示的数据条数 */ 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>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;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; } /** * 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"; }}StudentMapper
@Mapperpublic 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>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 */@Datapublic 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";}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<ExcelStudentDTO> { /** * 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<ExcelStudentDTO> list = new ArrayList<ExcelStudentDTO>(); 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！"); }}mybatisPlus分页插件
MybatisPlusConfig
@Configurationpublic 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); }}application.yaml
server: port: 8811spring: 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: 317311mybatis-plus: configuration:# sql日志 log-impl: org.apache.ibatis.logging.stdout.StdOutImpl mapper-locations: - classpath:mapper/*.xml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