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什么是 FastExcel

FastExcel 是由原 EasyExcel 作者创建的新项目。2023 年我已从阿里离职,近期阿里宣布停止更新 EasyExcel,我决定继续维护和升级这个项目。在重新开始时,我选择为它起名为 FastExcel,以突出这个框架在处理 Excel 文件时的高性能表现,而不仅仅是简单易用。

FastExcel 将始终坚持免费开源,并采用最开放的 MIT 协议,使其适用于任何商业化场景。这为开发者和企业提供了极大的自由度和灵活性。FastExcel 的一些显著特点包括:

  • 1、完全兼容原 EasyExcel 的所有功能和特性,这使得用户可以无缝过渡。

  • 2、从 EasyExcel 迁移到 FastExcel 只需简单地更换包名和 Maven 依赖即可完成升级。

  • 3、在功能上,比 EasyExcel 提供更多创新和改进。

  • 4、FastExcel 1.0.0 版本新增了读取 Excel 指定行数和将 Excel 转换为 PDF 的功能。

我们计划在未来推出更多新特性,以不断提升用户体验和工具实用性。欢迎大家关注 程序员小懒的公众号 关注FastExcel的发展。FastExcel 致力于成为您处理 Excel 文件的最佳选择。

主要特性

    1. 高性能读写:FastExcel 专注于性能优化,能够高效处理大规模的 Excel 数据。相比一些传统的 Excel 处理库,它能显著降低内存占用。
    1. 简单易用:该库提供了简洁直观的 API,使得开发者可以轻松集成到项目中,无论是简单的 Excel 操作还是复杂的数据处理都能快速上手。
    1. 流式操作:FastExcel 支持流式读取,将一次性加载大量数据的问题降到最低。这种设计方式在处理数十万甚至上百万行的数据时尤为重要。

安装

下表列出了各版本 FastExcel 基础库对 Java 语言版本最低要求的情况:

版本 jdk版本支持范围 备注
1.0.0+ jdk8 - jdk21 目前的master分支,完全兼容easyexcel

我们强烈建议您使用最新版本的 FastExcel,因为最新版本中的性能优化、BUG修复和新功能都会让您的使用更加方便。

当前 FastExcel 底层使用 poi 作为基础包,如果您的项目中已经有 poi 相关组件,需要您手动排除 poi 的相关 jar 包。

Maven

如果您使用 Maven 进行项目构建,请在 pom.xml 文件中引入以下配置:

<dependency>
    <groupId>cn.idev.excel</groupId>
    <artifactId>fastexcel</artifactId>
    <version>1.0.0</version>
</dependency>

Gradle

如果您使用 Gradle 进行项目构建,请在 build.gradle 文件中引入以下配置:

dependencies {
    implementation 'cn.idev.excel:fastexcel:1.0.0'
}

EasyExcel 与 FastExcel 的区别

    1. FastExcel 支持所有 EasyExcel 的功能,但是 FastExcel 的性能更好,更稳定。
    1. FastExcel 与 EasyExcel 的 API 完全一致,可以无缝切换。
    1. FastExcel 会持续的更新,修复 bug,优化性能,增加新功能。

EasyExcel 如何升级到 FastExcel

1. 修改依赖

将 EasyExcel 的依赖替换为 FastExcel 的依赖,如下:

<!-- easyexcel 依赖 -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>xxxx</version>
</dependency>

的依赖替换为

<dependency>
    <groupId>cn.idev.excel</groupId>
    <artifactId>fastexcel</artifactId>
    <version>1.0.0</version>
</dependency>

2. 修改代码

将 EasyExcel 的包名替换为 FastExcel 的包名,如下:

// 将 easyexcel 的包名替换为 FastExcel 的包名
import com.alibaba.excel.**;

替换为

import cn.idev.excel.**;

3. 不修改代码直接依赖 FastExcel

如果由于种种原因您不想修改代码,可以直接依赖 FastExcel ,然后在 pom.xml 文件中直接依赖 FastExcel。 EasyExcel 与 FastExcel 可以共存,但是长期建议替换为 FastExcel。

4. 建议以后使用 FastExcel 类

为了兼容性考虑保留了 EasyExcel 类,但是建议以后使用 FastExcel 类,FastExcel 类是FastExcel 的入口类,功能包含了 EasyExcel 类的所有功能,以后新特性仅在 FastExcel 类中添加。

简单示例:读取 Excel 文件

下面是读取 Excel 文档的例子:

// 实现 ReadListener 接口,设置读取数据的操作
public class DemoDataListener implements ReadListener<DemoData> {
    @Override
    public void invoke(DemoData data, AnalysisContext context) {
        System.out.println("解析到一条数据" + JSON.toJSONString(data));
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        System.out.println("所有数据解析完成!");
    }
}

public static void main(String[] args) {
    String fileName = "demo.xlsx";
    // 读取 Excel 文件
    FastExcel.read(fileName, DemoData.class, new DemoDataListener()).sheet().doRead();
}

简单示例:创建 Excel 文件

下面是一个创建 Excel 文档的简单例子:

// 示例数据类
public class DemoData {
    @ExcelProperty("字符串标题")
    private String string;
    @ExcelProperty("日期标题")
    private Date date;
    @ExcelProperty("数字标题")
    private Double doubleData;
    @ExcelIgnore
    private String ignore;
}

// 填充要写入的数据
private static List<DemoData> data() {
    List<DemoData> list = new ArrayList<>();
    for (int i = 0; i < 10; i++) {
        DemoData data = new DemoData();
        data.setString("字符串" + i);
        data.setDate(new Date());
        data.setDoubleData(0.56);
        list.add(data);
    }
    return list;
}

public static void main(String[] args) {
    String fileName = "demo.xlsx";
    // 创建一个名为“模板”的 sheet 页,并写入数据
    FastExcel.write(fileName, DemoData.class).sheet("模板").doWrite(data());
}

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