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SpringCloud微服务:EasyExcel实现Excel的优雅导入导出

  • 2026-04-15 20:34:17
SpringCloud微服务:EasyExcel实现Excel的优雅导入导出

SpringCloud微服务:EasyExcel实现Excel的优雅导入导出

在企业级应用开发中,Excel的导入导出功能几乎是必不可少的。传统的实现方式往往存在代码耦合度高、扩展性差、性能低下等问题。本文将基于SpringCloud微服务架构,介绍一种优雅的Excel导入导出解决方案。

一、项目架构设计

本项目采用模块化设计,将Excel导入导出功能拆分为独立的微服务:

spring-cloud-excel/
├── excel-common      # 公共模块(实体类、工具类、配置)
├── excel-export      # 导出服务
├── excel-import      # 导入服务
└── excel-test        # 测试服务

架构优势:

  • • 职责清晰:导入、导出功能独立部署
  • • 易于扩展:新增业务类型只需添加对应的Processor
  • • 高性能:支持异步批处理和分布式部署
  • • 可维护性强:统一的接口规范和错误处理

二、核心设计模式

2.1 策略模式 + 工厂模式

通过自定义注解实现策略的自动注册,避免硬编码:

/**
 * 导入业务注解
 */

@Retention(RetentionPolicy.RUNTIME)

@Target(ElementType.TYPE)

public
 @interface ExcelImport {
    ImportBusiness value();
}
/**
 * 导入处理器工厂
 */

@Component

public
 class ImportProcessorFactory implements BeanPostProcessor {

    private
 static final Map<ImportBusiness, ImportProcessor> IMPORT_STRATEGY_MAP = new ConcurrentHashMap<>();

    public
 ImportProcessor getImportProcessor(ImportBusiness importBusiness) {
        if
 (!IMPORT_STRATEGY_MAP.containsKey(importBusiness)) {
            throw
 new BusinessException("The imported type does not exist.");
        }
        return
 IMPORT_STRATEGY_MAP.get(importBusiness);
    }

    @Override

    public
 Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        // 只对实现了 ImportProcessor 的类做操作

        if
 (bean instanceof ImportProcessor importProcessor) {
            Class<?> clazz = AopUtils.getTargetClass(bean);
            ExcelImport
 annotation = clazz.getAnnotation(ExcelImport.class);
            // 绑定对应关系

            IMPORT_STRATEGY_MAP.put(annotation.value(), importProcessor);
        }
        return
 bean;
    }
}

这样做的好处:

  1. 1. 自动注册:通过 BeanPostProcessor 在Bean初始化后自动将处理器注册到工厂
  2. 2. 类型安全:编译期即可发现类型错误
  3. 3. 易扩展:新增业务类型只需添加实现类和注解
  4. 4. 解耦合:调用方无需关心具体实现细节

2.2 监听器模式

使用EasyExcel的 ReadListener 实现流式读取:

@Slf4j
@Component

@AllArgsConstructor

public
 class StudentImportListener implements ReadListener<StudentDTO> {

    private
 final List<StudentDTO> successList = new ArrayList<>();
    private
 static final int BATCH_COUNT = 100000;

    @Override

    public
 void invoke(StudentDTO studentDTO, AnalysisContext analysisContext) {
        // 数据校验

        if
 (StringUtils.isBlank(studentDTO.getName()) || studentDTO.getAge() == null) {
            log.error("读取错误的行数据:{}", studentDTO);
            return
;
        }
        successList.add(studentDTO);

        // 达到批次阈值后异步处理

        if
 (successList.size() >= BATCH_COUNT) {
            processBatch();
        }
    }

    @Override

    public
 void doAfterAllAnalysed(AnalysisContext analysisContext) {
        // 处理剩余数据

        if
 (CollectionUtils.isNotEmpty(successList)) {
            processBatch();
        }
    }
}

这样做的好处:

  1. 1. 内存友好:逐行读取,不会一次性加载整个文件到内存
  2. 2. 实时处理:边读边处理,提升响应速度
  3. 3. 灵活控制:可精确控制每批次的处理逻辑

三、异步批处理实现

3.1 自定义线程池

public class ThreadPoolUtils {
    private
 static final int FULL_PROCESSORS = 10;

    /**
     * 全局线程池
     */

    public
 static final ExecutorService EXECUTOR_SERVICE = new ThreadPoolExecutor(
            FULL_PROCESSORS,                              // 核心线程数
            FULL_PROCESSORS,                              // 最大线程数
            0L
,                                           // 空闲线程保活时间
            TimeUnit.SECONDS,
            new
 LinkedBlockingDeque<>(FULL_PROCESSORS * 1000),  // 阻塞队列
            new
 UtilityElf.DefaultThreadFactory("full-thread-pool-%d", false),
            new
 ThreadPoolExecutor.CallerRunsPolicy()     // 拒绝策略:由调用线程处理
    );
}

线程池配置要点:

  • • 核心线程数 = 最大线程数:避免线程创建销毁的开销
  • • 有界队列:防止内存溢出
  • • CallerRunsPolicy:拒绝策略保证任务不丢失

3.2 异步批处理代码

@Override
public
 void invoke(StudentDTO studentDTO, AnalysisContext analysisContext) {
    // ... 数据收集 ...


    if
 (successList.size() >= BATCH_COUNT) {
        log.info("读取数据量:{}条", successList.size());
        List<CompletableFuture<Boolean>> futures = new ArrayList<>();
        // 分片处理:每1000条一个批次

        List<List<StudentDTO>> lists = ListUtils.partition(successList, 1000);

        for
 (List<StudentDTO> list : lists) {
            // 异步处理数据

            CompletableFuture<Boolean> future = CompletableFuture.supplyAsync(() -> {
                List<Student> students = list.stream().map(item -> {
                    Student
 student = new Student();
                    student.setName(item.getName());
                    student.setAge(item.getAge());
                    return
 student;
                }).collect(Collectors.toList());
                return
 studentService.saveBatch(students);
            }, ThreadPoolUtils.EXECUTOR_SERVICE);
            futures.add(future);
        }
        // 等待所有异步任务完成

        CompletableFuture.allOf(futures.toArray(new CompletableFuture[0])).join();
        // 清空集合,释放资源

        successList.clear();
        lists.clear();
    }
}

这样做的好处:

  1. 1. 高吞吐量:多线程并行处理,充分利用CPU资源
  2. 2. 分片处理:避免单次处理数据量过大导致事务超时
  3. 3. 内存控制:及时清空已处理数据,防止OOM
  4. 4. 优雅等待allOf().join() 确保所有任务完成后再继续

四、导出功能实现

4.1 导出处理器

@Component
@AllArgsConstructor

@ExportExcel(ExportBusiness.STUDENT_INFO)

public
 class StudentExportProcessor implements ExportProcessor {

    private
 final StudentMapper studentMapper;

    @Override

    public
 List<?> process(ExportManagerDTO<?> exportManagerDTO) {
        StudentQO
 studentQO = JSON.parseObject(JSON.toJSONString(exportManagerDTO.getQuery()), StudentQO.class);
        // 分页查询

        Page<Student> page = new Page<>(studentQO.getPageNum(), studentQO.getPageSize());
        Page<Student> studentPage = studentMapper.selectPage(page, new LambdaQueryWrapper<Student>()
                .like(StringUtils.isNotBlank(studentQO.getName()), Student::getName, studentQO.getName()));

        // 数据转换

        AtomicInteger
 index = new AtomicInteger(1);
        return
 studentPage.getRecords().stream().map(item -> {
            StudentVO
 studentVO = new StudentVO();
            BeanUtils.copyProperties(item, studentVO);
            studentVO.setReqNum(index.getAndIncrement());
            return
 studentVO;
        }).toList();
    }
}

设计亮点:

  1. 1. 泛型设计ExportManagerDTO<?> 支持任意查询条件
  2. 2. 分页查询:避免一次查询大量数据导致性能问题
  3. 3. 动态条件:根据查询参数动态构建查询条件
  4. 4. 数据转换:将实体类转换为VO,控制导出字段

4.2 导出服务

@Override
public
 void exportExcel(ExportManagerDTO<?> exportManagerDTO) {
    ExportBusiness
 exportBusiness = exportManagerDTO.getExportBusiness();

    // 创建导出记录

    ExportManager
 exportManager = new ExportManager();
    String
 id = UUID.randomUUID().toString().replace("-", "");
    exportManager.setId(id);
    exportManager.setBusinessCode(exportBusiness.getCode());
    exportManager.setBusinessName(exportBusiness.getName());
    exportManager.setFileName(exportBusiness.getName());
    exportManager.setExcelType(ExcelTypeEnum.XLSX);
    exportManager.setExportStatus(ExportStatus.ING.getCode());
    exportManagerMapper.insert(exportManager);

    ExportManager
 exportManagerUpdate = new ExportManager();
    exportManagerUpdate.setId(id);
    try
 {
        // 获取对应的处理器

        ExportProcessor
 exportProcessor = exportProcessorFactory.getExportProcessor(exportBusiness);
        // 处理数据

        List<?> list = exportProcessor.process(exportManagerDTO);
        // 生成文件

        String
 fileName = this.getClass().getResource("/").getPath() + exportBusiness.getName() + "_" + System.currentTimeMillis() + ".xlsx";
        EasyExcelFactory.write(fileName, exportBusiness.getClazz())
                .excelType(exportManagerDTO.getExcelType())
                .sheet(exportBusiness.getName())
                .doWrite(list);

        exportManagerUpdate.setFilePath(fileName);
        exportManagerUpdate.setExportStatus(ExportStatus.SUCCESS.getCode());
    } catch (Exception e) {
        log.error("导出异常", e);
        exportManagerUpdate.setExportStatus(ExportStatus.FAILURE.getCode());
    }
    exportManagerMapper.updateById(exportManagerUpdate);
}

这样做的好处:

  1. 1. 状态追踪:记录导出状态,方便后续查询
  2. 2. 异常处理:导出失败时更新状态,不影响主流程
  3. 3. 统一接口:所有导出业务使用同一个入口

五、Feign服务调用

在测试服务中通过Feign调用导入导出服务:

@Service
@AllArgsConstructor

public
 class StudentServiceImpl implements StudentService {

    private
 final ExportClient exportClient;
    private
 final ImportClient importClient;

    @Override

    public
 void exportStudentExcel(StudentQO studentQO) {
        ExportManagerDTO<StudentQO> exportManagerDTO = new ExportManagerDTO<>();
        exportManagerDTO.setExportBusiness(ExportBusiness.STUDENT_INFO);
        exportManagerDTO.setQuery(studentQO);
        exportClient.exportExcel(exportManagerDTO);
    }

    @Override

    public
 String importStudentExcel(MultipartFile file) {
        return
 importClient.importExcel(ImportBusiness.STUDENT_INFO.getCode(), file);
    }
}

微服务调用的优势:

  1. 1. 服务解耦:导入导出功能独立部署、独立扩展
  2. 2. 负载均衡:通过Consul实现服务发现和负载均衡
  3. 3. 容错机制:Feign自带熔断降级能力

六、业务枚举设计

@Getter
@AllArgsConstructor

public
 enum ImportBusiness {
    STUDENT_INFO("01", "学生信息", StudentDTO.class),
    TEACHER_INFO("02", "教师信息", TeacherDTO.class),
    ;

    private
 final String code;
    private
 final String name;
    private
 final Class<?> clazz;

    public
 static ImportBusiness getByCode(String code) {
        for
 (ImportBusiness importBusiness : ImportBusiness.values()) {
            if
 (importBusiness.code.equals(code)) {
                return
 importBusiness;
            }
        }
        throw
 new BusinessException("ImportBusiness code error");
    }
}

枚举设计的好处:

  1. 1. 类型安全:避免字符串硬编码
  2. 2. 集中管理:所有业务类型统一维护
  3. 3. 携带元数据:可关联对应的DTO类

七、技术选型

技术
版本
用途
Spring Boot
3.1.1
基础框架
Spring Cloud
2022.0.3
微服务框架
EasyExcel
4.0.3
Excel处理
MyBatis-Plus
3.5.9
ORM框架
Consul
1.15.4
服务注册与发现
OpenFeign
4.0.3
服务调用

八、总结

本文介绍的Excel导入导出方案具有以下特点:

  • • 高内聚低耦合:通过策略模式和工厂模式实现业务解耦
  • • 高性能:异步批处理 + 线程池 + 流式处理
  • • 易扩展:新增业务类型只需添加对应的Processor实现
  • • 可追溯:导入导出过程全程记录状态
  • • 微服务架构:独立部署、独立扩展,适应高并发场景

这种优雅的设计方案不仅适用于Excel导入导出场景,对于类似的文件处理需求也有很好的参考价值。


源码地址:https://github.com/LuckyKuang/leaning-demo

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  1. CONNECT:[ UseTime:0.000994s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001306s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000553s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000581s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001120s ]
  6. SELECT * FROM `set` [ RunTime:0.000490s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001241s ]
  8. SELECT * FROM `article` WHERE `id` = 461370 LIMIT 1 [ RunTime:0.001812s ]
  9. UPDATE `article` SET `lasttime` = 1776450182 WHERE `id` = 461370 [ RunTime:0.002444s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000363s ]
  11. SELECT * FROM `article` WHERE `id` < 461370 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000531s ]
  12. SELECT * FROM `article` WHERE `id` > 461370 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000417s ]
  13. SELECT * FROM `article` WHERE `id` < 461370 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001195s ]
  14. SELECT * FROM `article` WHERE `id` < 461370 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011452s ]
  15. SELECT * FROM `article` WHERE `id` < 461370 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007517s ]
0.198540s