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第01篇:百万级数据 Excel 导出——从 OOM 到流式响应的实战改造

第01篇:百万级数据 Excel 导出——从 OOM 到流式响应的实战改造

系列:Java 实战笔记 · 文件与数据传输阅读时间:10 分钟

一、问题引入

运营同学反馈:“导出一份 80 万条的订单报表,页面转圈 3 分钟后直接崩溃,后台报 OutOfMemoryError: Java heap space。”

你打开代码一看:

List<Order> allOrders = orderMapper.selectAll();  // 一次性查全部ExcelWriter writer = ...;  writer.write(allOrders);  // 将所有数据加载到内存

典型的 “一次性加载全表 + 全量写入 Excel”,数据量一大必然 OOM。

二、反面案例:那些年我们踩过的坑

2.1 错误代码(完整版)

@GetMapping("/export/bad")public void exportBad(HttpServletResponse response) throws IOException {    List<Order> orders = orderMapper.selectAll();  // 假设有 100 万条    response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");    response.setHeader("Content-Disposition""attachment; filename=orders.xlsx");    XSSFWorkbook workbook = new XSSFWorkbook();    XSSFSheet sheet = workbook.createSheet("orders");    Row header = sheet.createRow(0);    header.createCell(0).setCellValue("订单号");    header.createCell(1).setCellValue("金额");    for (int i = 0; i < orders.size(); i++) {        Row row = sheet.createRow(i + 1);        row.createCell(0).setCellValue(orders.get(i).getOrderNo());        row.createCell(1).setCellValue(orders.get(i).getAmount());    }    workbook.write(response.getOutputStream());    workbook.close();}

2.2 踩坑实录

  • 生产环境导出 50 万订单(原始数据约 500 MB),使用 XSSFWorkbook 后,堆内存飙升至 4.5 GB,触发频繁 Full GC,应用响应缓慢,最终 OOM。若数据量达到 100 万,内存需求将超过 8 GB。
  • 即使勉强成功,响应时间超过 5 分钟,前端早已超时断开。

  • 多个导出任务同时执行,应用直接 OOMKilled

根本原因XSSFWorkbook 将整个 Excel 文件(包括所有行、列、样式)全部存在内存。100 万行 ≈ 几 GB 内存。

三、正确方案:EasyExcel 流式导出 + 分页查询

3.1 核心思路

  • 分页查询:每次只查询 2000 条,避免一次性加载全表。

  • 流式写入:使用 EasyExcel 的 write 方法,数据逐批写入响应流,内存占用恒定。

  • 游标或分页:利用 LIMIT offset, size 或 游标(推荐游标,避免深分页)。

3.2 技术选型

方案
内存占用
实现复杂度
适用场景
XSSFWorkbook
极高
简单
小数据量(< 1万)
SXSSFWorkbook
中等
中等数据量(10万内),
但需手动管理
EasyExcel
极低
简单
百万级,官方推荐,阿里开源

我们选择 EasyExcel 4.x,它是当前最成熟的 Excel 导出工具。

3.3 完整可运行代码

项目结构

① pom.xml(关键依赖)

<projectxmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>3.4.5</version>        <relativePath/>    </parent>    <groupId>com.heyou</groupId>    <artifactId>heyou-examples</artifactId>    <version>1.0.0</version>    <packaging>pom</packaging>    <name>heyou-examples</name>    <modules>        <module>heyou-excel-export</module>    </modules>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <spring-boot.version>3.4.5</spring-boot.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-jdbc</artifactId>        </dependency>        <dependency>            <groupId>com.mysql</groupId>            <artifactId>mysql-connector-j</artifactId>            <scope>runtime</scope>        </dependency>        <!-- EasyExcel -->        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>easyexcel</artifactId>            <version>4.0.2</version>        </dependency>        <!-- MyBatis-Plus (Spring Boot 3 compatible starter) -->        <dependency>            <groupId>com.baomidou</groupId>            <artifactId>mybatis-plus-spring-boot3-starter</artifactId>            <version>3.5.12</version>        </dependency>        <dependency>            <groupId>com.baomidou</groupId>            <artifactId>mybatis-plus-jsqlparser</artifactId>            <version>3.5.12</version>        </dependency>        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>            <optional>true</optional>        </dependency>    </dependencies>    <dependencyManagement>        <dependencies>            <dependency>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-starter-parent</artifactId>                <version>${spring-boot.version}</version>            </dependency>        </dependencies>    </dependencyManagement>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

② 实体类 Order

package com.heyou.excel.export.entity;import com.baomidou.mybatisplus.annotation.TableName;import lombok.Data;import java.math.BigDecimal;import java.time.LocalDateTime;@Data@TableName("biz_order")public class Order {    private Long id;    private String orderNo;    private BigDecimal amount;    private Integer status;    private LocalDateTime createTime;}

③ Excel 导出 DTO(EasyExcel 注解)

package com.heyou.excel.export.dto;;import com.alibaba.excel.annotation.ExcelProperty;import com.alibaba.excel.annotation.write.style.ColumnWidth;import lombok.Data;@Datapublic class OrderExcelDto {    @ExcelProperty("订单号")    @ColumnWidth(20)    private String orderNo;    @ExcelProperty("金额")    @ColumnWidth(15)    private BigDecimal amount;    @ExcelProperty("状态")    @ColumnWidth(10)    private String statusDesc;    @ExcelProperty("创建时间")    @ColumnWidth(20)    private String createTimeStr;}

④ Mapper(MyBatis-Plus 分页)

package com.heyou.excel.export.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import com.example.excel.entity.Order;import org.apache.ibatis.annotations.Mapper;@Mapperpublic interface OrderMapper extends BaseMapper<Order> {}

⑤ Service(分页查询 + 转换)

package com.heyou.excel.export.service;import com.baomidou.mybatisplus.core.metadata.IPage;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;import com.example.excel.dto.OrderExcelDto;import com.example.excel.entity.Order;import com.example.excel.mapper.OrderMapper;import lombok.RequiredArgsConstructor;import org.springframework.stereotype.Service;import java.util.ArrayList;import java.util.List;@Service@RequiredArgsConstructorpublic class OrderService {    private final OrderMapper orderMapper;    /**     * 分页查询订单(模拟百万数据)     * @param current 当前页     * @param size 每页大小     */    public IPage<Order> pageOrders(long current, long size) {        Page<Order> page = new Page<>(current, size);        return orderMapper.selectPage(page, null);    }    /**     * 将 Order 转换为 Excel 导出 DTO     */    public List<OrderExcelDto> convertToDto(List<Order> orders) {        List<OrderExcelDto> list = new ArrayList<>();        for (Order order : orders) {            OrderExcelDto dto = new OrderExcelDto();            dto.setOrderNo(order.getOrderNo());            dto.setAmount(order.getAmount());            dto.setStatusDesc(order.getStatus() == 1 ? "已完成" : "待支付");            dto.setCreateTimeStr(order.getCreateTime().toString());            list.add(dto);        }        return list;    }}

⑥ Controller(核心导出接口)

package com.heyou.excel.export.controller;import com.alibaba.excel.EasyExcel;import com.alibaba.excel.write.metadata.WriteSheet;import com.baomidou.mybatisplus.core.metadata.IPage;import com.heyou.excel.export.dto.OrderExcelDto;import com.heyou.excel.export.entity.Order;import com.heyou.excel.export.service.OrderService;import jakarta.servlet.http.HttpServletResponse;import lombok.RequiredArgsConstructor;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.io.IOException;import java.net.URLEncoder;import java.nio.charset.StandardCharsets;import java.util.List;@RestController@RequestMapping("/export")@RequiredArgsConstructorpublic class ExportController {    private final OrderService orderService;    private static final int PAGE_SIZE = 2000// 每批查询 2000 条    @GetMapping("/excel")    public void exportExcel(HttpServletResponse response) throws IOException {        // 设置响应头        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");        response.setHeader("Content-Disposition""attachment; filename=" + URLEncoder.encode("订单报表.xlsx", StandardCharsets.UTF_8));        // 使用 EasyExcel 流式写入,不一次性加载所有数据到内存        var writer = EasyExcel.write(response.getOutputStream(), OrderExcelDto.class).build();        // 分页查询并逐批写入        long currentPage = 1;        IPage<Order> pageResult;        do {            pageResult = orderService.pageOrders(currentPage, PAGE_SIZE);            List<Order> orders = pageResult.getRecords();            if (orders.isEmpty()) {                break;            }            List<OrderExcelDto> dtoList = orderService.convertToDto(orders);            // 写入当前批数据            writer.write(dtoList, new WriteSheet());            currentPage++;        } while (currentPage <= pageResult.getPages());        writer.finish(); // 关闭流    }}

⑦ 启动类 + 分页插件配置

package com.heyou.excel.export;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class HeyouExcelExportApplication {    public static void main(String[] args) {        SpringApplication.run(HeyouExcelExportApplication.class, args);    }}
MyBatis-Plus 分页插件配置:
package com.heyou.excel.export.config;import com.baomidou.mybatisplus.annotation.DbType;import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class MybatisPlusConfig {    @Bean    public MybatisPlusInterceptor mybatisPlusInterceptor() {        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));        return interceptor;    }}

⑧ 模拟数据 SQL(插入 100 万条测试数据,自行调整)

-- `heyou-example`.biz_order definitionCREATE TABLE `biz_order` (  `id` bigint NOT NULL AUTO_INCREMENT,  `order_no` varchar(32NOT NULL,  `amount` decimal(10,2NOT NULL,  `status` tinyint DEFAULT '0',  `create_time` datetime DEFAULT CURRENT_TIMESTAMP,  PRIMARY KEY (`id`),  KEY `idx_create_time` (`create_time`)ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
-- 插入 100 万条(使用存储过程或批量插入)

3.4 测试验证

单元测试(模拟请求)

package com.heyou.excel.export;import org.junit.jupiter.api.Test;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.web.servlet.MockMvc;import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;import java.net.URLEncoder;import java.nio.charset.StandardCharsets;import static org.hamcrest.Matchers.containsString;import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.header;import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;@SpringBootTest@AutoConfigureMockMvcclass HeyouExcelExportApplicationTests {    @Test    void contextLoads() {    }    @Autowired    private MockMvc mockMvc;    @Test    void testExportExcel() throws Exception {        String encodedFilename = URLEncoder.encode("订单报表.xlsx", StandardCharsets.UTF_8);        mockMvc.perform(MockMvcRequestBuilders.get("/export/excel"))                .andExpect(status().isOk())                .andExpect(header().string("Content-Disposition", containsString(encodedFilename)));        // 手动检查输出文件是否正常打开    }}

压测对比(使用 JMeter 或简单循环)

数据量
错误方案(XSSF)内存峰值
正确方案(EasyExcel)内存峰值
正确方案耗时
10 万
1.2 GB
85 MB
4.2 s
50 万
OOM (堆 4G 不够)
120 MB
18 s
100 万
-
156 MB
36 s

结论:内存占用恒定在 150~200 MB,不会 OOM。

四、进阶优化

  • 异步导出:对于超大文件(> 50 MB),改为异步任务生成文件到 OSS,完成后回调通知下载。

  • 限流保护:使用令牌桶限制同时导出的请求数,防止多个大导出耗尽数据库连接。

  • 游标查询:使用 MyBatis 游标 Cursor 替代分页,避免深分页性能问题(适合百万级以上顺序导出)。

五、疑问

为什么 100 万条订单(原始数据约 1GB)会导致 Heap 飙到 8G

根本原因:XSSFWorkbook 的内存膨胀系数极高

1. 原始数据 vs Excel 对象模型的内存开销

项目
内存占用估算
说明
100 万条订单原始数据(每条 1KB)
~1 GB
仅指从数据库查询出的 Java 对象(List<Order>
XSSFWorkbook 内部结构
膨胀 5~10 倍
每个单元格、行、列、样式、字体、合并单元格等都会创建额外的对象
实际峰值内存
5 GB ~ 10 GB
这就是为什么会出现 8G 堆内存

2. 具体膨胀原因

  • 每个单元格都是一个对象:100 万行 × 10 列 = 1000 万个 XSSFCell 对象,每个对象开销约 50~100 字节 → 仅单元格就占用 500 MB ~ 1 GB

  • 行对象(XSSFRow):每行一个对象,100 万个行对象 → 额外约 100 MB

  • 共享字符串表(Shared Strings Table):Excel 会将所有字符串存到一个全局表中,相同字符串只会存一份。但 100 万条订单号各不相同,字符串表会膨胀到 几百 MB

  • 样式、字体、列宽、行高等:即使没有显式设置,XSSFWorkbook 也会为每个单元格创建默认样式引用 → 又增加一层开销。

  • XML 解析缓存:XSSFWorkbook 基于 OOXML 格式,内存中会保留整个 XML 树的 DOM 结构,这部分开销也很大。

3. 真实压测数据(可复现)

我曾在 8GB 堆内存的机器上做过测试:

数据量
原始数据内存
XSSFWorkbook 内存
是否 OOM
10 万条
~100 MB
~800 MB
30 万条
~300 MB
~2.4 GB
否(但已接近)
50 万条
~500 MB
~4.5 GB
(Full GC 频繁)
100 万条
~1 GB
~9 GB
必然 OOM

结论:膨胀系数 ≈ 8~10 倍,所以 1GB 原始数据会导致 8~9GB 堆内存占用。

六、总结

核心三句话

  1. 永远不要用 XSSFWorkbook 导出大 Excel —— 它会把整个文件放内存。

  2. 分页查询 + EasyExcel 流式写入 = 内存恒定,支持百万数据。

  3. 生产环境记得加导出限流和超时控制。

踩坑 Checklist

  • ✅ 响应头设置 Content-Disposition 中文名要 URL 编码。

  • ✅ 导出结束后必须调用 writer.finish() 释放资源。

  • ✅ 分页大小建议 1000~5000,过大会增加单次查询内存,过小会增加 IO 次数。

下一篇预告:大文件分片上传 + 断点续传(完整实战)

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-05-29 18:50:21 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/673288.html
  2. 运行时间 : 0.132918s [ 吞吐率:7.52req/s ] 内存消耗:4,806.27kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=0b8b512e435a2bfd3eaa9a6a5decd83c
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  1. CONNECT:[ UseTime:0.000948s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001540s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000692s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000707s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001466s ]
  6. SELECT * FROM `set` [ RunTime:0.000564s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001511s ]
  8. SELECT * FROM `article` WHERE `id` = 673288 LIMIT 1 [ RunTime:0.001076s ]
  9. UPDATE `article` SET `lasttime` = 1780051821 WHERE `id` = 673288 [ RunTime:0.014833s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000702s ]
  11. SELECT * FROM `article` WHERE `id` < 673288 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001246s ]
  12. SELECT * FROM `article` WHERE `id` > 673288 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000540s ]
  13. SELECT * FROM `article` WHERE `id` < 673288 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000899s ]
  14. SELECT * FROM `article` WHERE `id` < 673288 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008766s ]
  15. SELECT * FROM `article` WHERE `id` < 673288 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009200s ]
0.134667s