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别再让Excel导入拖垮系统:百万条数据秒级入库全链路实战

  • 2026-04-03 10:05:57
别再让Excel导入拖垮系统:百万条数据秒级入库全链路实战

别再让Excel导入拖垮系统:百万条数据秒级入库全链路实战

一、前言

很多系统在做 Excel 导入时,代码逻辑并不复杂,但一到 50 万行、100 万行就会出现:

  • • 接口超时,用户反复重传
  • • JVM 内存飙升,Full GC 频发
  • • 数据库写入抖动,线上业务被拖慢

本文代码片段给出一套可直接落地的百万级导入优化方案

  • • 流式解析(不把全量数据读入内存)
  • • 分片并行(解析/校验/写库解耦)
  • • 批量写库(控制事务粒度)
  • • 进度可观测(支持失败重试)

二、先看全链路架构

百万级Excel导入总体架构

核心思想只有一句话:让 CPU 做 CPU 擅长的事,让 IO 做 IO 擅长的事,中间用队列削峰填谷。

三、Controller 入口

excelImport 方法非常薄,只做请求接入和服务转发:

  1. 1. 接收 authorization 和 ExcelImportDTO
  2. 2. 调用 commonService.excelImport(...)
  3. 3. 返回统一 ApiResult.success()
@PostMapping("excelImport")public ApiResult<String> excelImport(@RequestHeader String authorization,                                     ExcelImportDTO excelImportDTO) {    commonService.excelImport(authorization, excelImportDTO);    return ApiResult.success();}

四、Service 与 Handler:核心导入逻辑

4.1 Service入口

excelImport 负责鉴权、业务类型判断、触发 EasyExcel 读取并统计耗时。

@Overridepublic void excelImport(String authorization, ExcelImportDTO excelImportDTO) {    // 验证签名    TokenUtils.tokenSignatureVerify(authorization);    ExcelImportBusinessType businessType = ExcelImportBusinessType.getByCode(excelImportDTO.getBusinessType());    try {        long beginTime = System.currentTimeMillis();        // 账号导入        if (ExcelImportBusinessType.PS_ACCOUNT.getCode().equals(excelImportDTO.getBusinessType())) {            // easyexcel的read方法进行数据读取            EasyExcelFactory.read(excelImportDTO.getFile().getInputStream(), PsTrainerAccountDTO.class, trainerAccountImportHandler)                    .sheet()                    .doRead();        } else {            throw new ServerException("businessType is error...");        }        double time = (System.currentTimeMillis() - beginTime) / 1000.00;        log.info("导入{}文件耗时:{}秒", businessType.getDesc(), time);    } catch (IOException e) {        log.error("导入{}文件异常", businessType.getDesc(), e);    }}

4.2 PsTrainerAccountImportHandler 关键处理片段

PsTrainerAccountImportHandler 的核心策略是:累计到 BATCH_COUNT 后切分为 1000 一组,并发执行 saveBatch

@Slf4j@Componentpublic class PsTrainerAccountImportHandler implements ReadListener<PsTrainerAccountDTO> {    // 成功数据    private final List<PsTrainerAccountDTO> successList = new ArrayList<>();    // 单次处理条数    private static final int BATCH_COUNT = 100000;    @Resource    private PsTrainerAccountService trainerAccountService;    /**     * 读取表格内容,每一条数据解析都会来调用     * @param psAccount    one row value. It is same as {@link AnalysisContext#readRowHolder()}     * @param analysisContext analysis context     */    @Override    public void invoke(PsTrainerAccountDTO psAccount, AnalysisContext analysisContext) {        if (psAccount.getMemoryTagId() == null || StringUtils.isBlank(psAccount.getMemoryTagHash()) || psAccount.getMemoryTagType() == null) {            log.error("读取错误的行数据:{}", psAccount);            return;        }        successList.add(psAccount);        if (successList.size() >= BATCH_COUNT) {            log.info("读取数据量:{}条", successList.size());            List<CompletableFuture<Boolean>> futures = new ArrayList<>();            List<List<PsTrainerAccountDTO>> lists = ListUtil.split(successList, 1000);            for (List<PsTrainerAccountDTO> list : lists) {                // 异步处理数据                CompletableFuture<Boolean> future = CompletableFuture.supplyAsync(() -> {                    List<PsTrainerAccount> psTrainerAccounts = PsAccountConverter.INSTANCE.psAccountDTOListToPsAccountList(list);                    return trainerAccountService.saveBatch(psTrainerAccounts);                }, ThreadPoolUtils.EXECUTOR_SERVICE);                futures.add(future);            }            // 等待所有异步任务完成(此处会阻塞,直到所有线程处理完成)            CompletableFuture.allOf(futures.toArray(new CompletableFuture[0])).join();            // 清空集合,释放资源            successList.clear();            lists.clear();        }    }    /**     * 所有数据读取完成之后调用     */    @Override    public void doAfterAllAnalysed(AnalysisContext analysisContext) {        // 读取剩余数据        if (CollectionUtils.isNotEmpty(successList)) {            log.info("最后读取数据量:{}条", successList.size());            List<PsTrainerAccount> psTrainerAccounts = PsAccountConverter.INSTANCE.psAccountDTOListToPsAccountList(successList);            trainerAccountService.saveBatch(psTrainerAccounts);            successList.clear();        }        log.info("数据导入完成,总共导入{}行...",analysisContext.readRowHolder().getRowIndex());    }    /**     * 读取标题,里面实现在读完标题后会回调     */    @Override    public void invokeHead(Map<Integer, ReadCellData<?>> headMap, AnalysisContext context) {        ReadListener.super.invokeHead(headMap, context);        log.info("标题:{}",headMap.values().stream().map(CellData::getStringValue).collect(Collectors.toList()));    }    /**     * 转换异常 获取其他异常下会调用本接口。抛出异常则停止读取。如果这里不抛出异常则 继续读取下一行     */    @Override    public void onException(Exception exception, AnalysisContext context) throws Exception {        ReadListener.super.onException(exception, context);        log.error("数据读取异常,正在读取的行数:{}行",context.readRowHolder(),exception);    }}

4.3 当前项目参数

  • • 单次累计阈值:BATCH_COUNT = 100000
  • • 每批异步入库分片:1000
  • • 并发执行器:ThreadPoolUtils.EXECUTOR_SERVICE

五、分片并行流程图

分片并行与批量写入流程

六、性能实测结果

本次数据来自 PsTrainerAccountImportHandler 链路实测:

数据量
字段数
导入耗时
100 万
10
约 50 秒

折算吞吐约为 2 万行/秒说明:该结果会受索引数量、磁盘 IO、数据库负载和事务配置影响。


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  1. CONNECT:[ UseTime:0.000375s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000545s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000232s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000272s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000513s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000574s ]
  8. SELECT * FROM `article` WHERE `id` = 480521 LIMIT 1 [ RunTime:0.000825s ]
  9. UPDATE `article` SET `lasttime` = 1775402387 WHERE `id` = 480521 [ RunTime:0.002455s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000273s ]
  11. SELECT * FROM `article` WHERE `id` < 480521 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001922s ]
  12. SELECT * FROM `article` WHERE `id` > 480521 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001026s ]
  13. SELECT * FROM `article` WHERE `id` < 480521 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002822s ]
  14. SELECT * FROM `article` WHERE `id` < 480521 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014715s ]
  15. SELECT * FROM `article` WHERE `id` < 480521 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008576s ]
0.105641s