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EasyExcel
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======================
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[![Build Status](https://github.com/alibaba/easyexcel/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/alibaba/easyexcel/actions/workflows/ci.yml?query=branch%3Amaster)
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[![Maven central](https://maven-badges.herokuapp.com/maven-central/com.alibaba/easyexcel/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.alibaba/easyexcel)
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[![License](http://img.shields.io/:license-apache-brightgreen.svg)](http://www.apache.org/licenses/LICENSE-2.0.html)
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[![](https://img.shields.io/badge/EasyExcel-%E6%9F%A5%E7%9C%8B%E8%B4%A1%E7%8C%AE%E6%8E%92%E8%A1%8C%E6%A6%9C-orange)](https://opensource.alibaba.com/contribution_leaderboard/details?projectValue=easyexcel)
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# 新手必读
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* 新手必读:🔥🔥🔥 [必读!!!](https://mp.weixin.qq.com/s/8RCyyx1EspiDPFnoYMx-Kw)
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* 官方网站:[https://easyexcel.opensource.alibaba.com/](https://easyexcel.opensource.alibaba.com/)
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* github地址:[https://github.com/alibaba/easyexcel](https://github.com/alibaba/easyexcel)
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* gitee地址:[https://gitee.com/easyexcel/easyexcel](https://gitee.com/easyexcel/easyexcel)
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# JAVA解析Excel工具
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Java解析、生成Excel比较有名的框架有Apache poi、jxl。但他们都存在一个严重的问题就是非常的耗内存,poi有一套SAX模式的API可以一定程度的解决一些内存溢出的问题,但POI还是有一些缺陷,比如07版Excel解压缩以及解压后存储都是在内存中完成的,内存消耗依然很大。
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easyexcel重写了poi对07版Excel的解析,一个3M的excel用POI sax解析依然需要100M左右内存,改用easyexcel可以降低到几M,并且再大的excel也不会出现内存溢出;03版依赖POI的sax模式,在上层做了模型转换的封装,让使用者更加简单方便
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# 🔥作者强烈推荐的数据库管理工具:Chat2DB
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AI 驱动的数据库管理、数据分析工具,支持Mysql、pg、oracle、sqlserver、redis等10多种数据库
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* Github 地址: [https://github.com/chat2db/Chat2DB](https://github.com/chat2db/Chat2DB)
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* 官网:[https://chat2db-ai.com](https://chat2db-ai.com)
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<p align="center">
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<a href="https://chat2db.ai/" target="_blank">
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<img src="https://chat2db-cdn.oss-us-west-1.aliyuncs.com/website/img/cover.png" alt="Chat2DB" />
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</a>
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</p>
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# 16M内存23秒读取75M(46W行25列)的Excel(3.2.1+版本)
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当然还有[极速模式](https://easyexcel.opensource.alibaba.com/qa/read#%E5%BC%80%E5%90%AF%E6%80%A5%E9%80%9F%E6%A8%A1%E5%BC%8F)
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能更快,但是内存占用会在100M多一点
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![img](img/readme/large.png)
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# 最新版本
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```xml
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<dependency>
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<groupId>com.alibaba</groupId>
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<artifactId>easyexcel</artifactId>
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<version>3.3.4</version>
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</dependency>
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```
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# 帮忙点个⭐Star
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开源不易,如果觉得EasyExcel对您的工作还是有帮助的话,请帮忙在<a target="_blank" href='https://github.com/alibaba/easyexcel'><img src="https://img.shields.io/github/stars/alibaba/easyexcel.svg?style=flat-square&label=Stars&logo=github" alt="github star"/></a>
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的右上角点个⭐Star,您的支持是使EasyExcel变得更好最大的动力。
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# 如何获取帮助
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## 优先建议自己通过文档来解决问题
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* [快速开始](https://easyexcel.opensource.alibaba.com/docs/current/)
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* [常见问题](https://easyexcel.opensource.alibaba.com/docs/qa/)
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* [API](https://easyexcel.opensource.alibaba.com/docs/current/api/)
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## 其次建议通过`issues`来解决解决问题
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可以尝试在以下2个链接搜索问题,如果不存在可以尝试创建`issue`。
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* 去 [github](https://github.com/alibaba/easyexcel/issues) 搜索`issues`
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* 去 [gitee](https://gitee.com/easyexcel/easyexcel/issues) 搜索`issues`
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通过 `issues` 解决问题,可以给后面遇到相同问题的同学查看,所以比较推荐这种方式。
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不管`github`、`gitee`都会定期有人回答您的问题,比较紧急可以在提完`issue`以后在钉钉群艾特群主并发送`issue`地址帮忙解决。
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`QQ` 公司不让用,有时候也会去看,但是核心肯定还是在钉钉。
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## 也可以加入钉钉&QQ群来解决问题
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加入钉钉或QQ群,看完公告可以获得帮助 。
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比较推荐钉钉群,`QQ` 公司不让用,当然QQ群也会有热心网友帮忙解决。
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[QQ1群(已满): 662022184](https://jq.qq.com/?_wv=1027&k=1T21jJxh)
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[QQ2群(已满): 1097936804](https://jq.qq.com/?_wv=1027&k=j5zEy6Xl)
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[QQ3群(已满): 453928496](https://qm.qq.com/cgi-bin/qm/qr?k=e2ULsA5A0GldhV2CXJ8sIbAyu9I6qqs7&jump_from=webapi)
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[QQ4群(已满): 496594404](https://qm.qq.com/cgi-bin/qm/qr?k=e_aVG1Q7gi0PJUBkbrUGAgbeO3kUEInK&jump_from=webapi)
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[QQ5群(已满): 451925680](https://jq.qq.com/?_wv=1027&k=6VHhvxyf)
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[QQ6群(已满): 784741035](https://jq.qq.com/?_wv=1027&k=BbLBIo9P)
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[QQ7群(已满): 667889383](http://qm.qq.com/cgi-bin/qm/qr?_wv=1027&k=XdTLw3Z3pr63VT0IkyoY-2t25TG7WxbG&authKey=gQKvTXipsjfUO1aNfL9zdHTfOmkqC6E%2BQ2zDg2jym8h3qXuQ7RtkpeAHeg9I4UhL&noverify=0&group_code=667889383)
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[QQ8群: 113968681](https://qm.qq.com/q/qwfl5RRBAG)
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[钉钉1群(已满): 21960511](https://qr.dingtalk.com/action/joingroup?code=v1,k1,cchz6k12ci9B08NNqhNRFGXocNVHrZtW0kaOtTKg/Rk=&_dt_no_comment=1&origin=11)
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[钉钉2群(已满): 32796397](https://qr.dingtalk.com/action/joingroup?code=v1,k1,jyU9GtEuNU5S0QTyklqYcYJ8qDZtUuTPMM7uPZTS8Hs=&_dt_no_comment=1&origin=11)
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[钉钉3群(已满): 33797247](https://qr.dingtalk.com/action/joingroup?code=v1,k1,3UGlEScTGQaHpW2cIRo+gkxJ9EVZ5fz26M6nW3uFP30=&_dt_no_comment=1&origin=11)
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[钉钉4群(已满): 33491624](https://qr.dingtalk.com/action/joingroup?code=v1,k1,V14Pb65Too70rQkEaJ9ohb6lZBZbtp6jIL/q9EWh9vA=&_dt_no_comment=1&origin=11)
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[钉钉5群(已满): 32134498](https://h5.dingtalk.com/circle/healthCheckin.html?dtaction=os&corpId=dingb9fa1325d9dccc3ecac589edd02f1650&5233a=71a83&cbdbhh=qwertyuiop)
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[钉钉6群(已满): 34707941](https://h5.dingtalk.com/circle/healthCheckin.html?dtaction=os&corpId=dingcf68008a1d443ac012d5427bdb061b7a&6ae36c3d-0c80-4=22398493-6c2a-4&cbdbhh=qwertyuiop)
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[钉钉7群(已满): 35235427](https://h5.dingtalk.com/circle/healthCheckin.html?dtaction=os&corpId=ding532b9018c06c7fc8660273c4b78e6440&167fb=ed003&cbdbhh=qwertyuiop)
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[钉钉8群(已满): 44752220](https://h5.dingtalk.com/circle/healthCheckin.html?dtaction=os&corpId=dingea96808beee421693fd4ba7542d6e5da&0380092a-fa46=a6a40905-7951&cbdbhh=qwertyuiop)
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[钉钉9群(已满): 11045002277](https://h5.dingtalk.com/circle/healthCheckin.html?dtaction=os&corpId=dinge338d2215891c0459c13cd6b2cb108a6&6972d=b92f9&cbdbhh=qwertyuiop)
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[钉钉10群(已满): 27360019755](https://qr.dingtalk.com/action/joingroup?code=v1,k1,v25LHn2liWmrWUKlkhIzOTcK7s7onp/sZP8mO5oIYSs=&_dt_no_comment=1&origin=11)
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[钉钉11群(已满):24330026964](https://qr.dingtalk.com/action/joingroup?code=v1,k1,63PjvTncu81oQ3X6XmGEJqnwQHCQxi/jaVlbUStq79o=&_dt_no_comment=1&origin=11)
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[钉钉12群(已满):27210038956](https://qr.dingtalk.com/action/joingroup?code=v1,k1,3mKi7VTGlYO+IsDX5n7sYYm2Qrlm220kMBPsJFzKRis=&_dt_no_comment=1&origin=11)
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[钉钉13群:83695000992](https://qr.dingtalk.com/action/joingroup?code=v1,k1,2JFUbWfxD1fGiq7LRW+mYjcK7s7onp/s1ZqOvfzkFGE=&_dt_no_comment=1&origin=11)
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## 关注作者:程序员小獭
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![qrcode_for_gh_c43212c8d0ed_258](https://github.com/alibaba/easyexcel/assets/22975773/13ceff34-d547-421b-b9a9-04f388792099)
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# 维护者
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姬朋飞(玉霄)、庄家钜
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# 快速开始
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## 读Excel
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demo代码地址:[https://github.com/alibaba/easyexcel/blob/master/easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/read/ReadTest.java](https://github.com/alibaba/easyexcel/blob/master/easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/read/ReadTest.java)
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详细文档地址:[https://easyexcel.opensource.alibaba.com/docs/current/quickstart/read](https://easyexcel.opensource.alibaba.com/docs/current/quickstart/read)
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```java
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/**
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* 最简单的读
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* <p>1. 创建excel对应的实体对象 参照{@link DemoData}
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* <p>2. 由于默认一行行的读取excel,所以需要创建excel一行一行的回调监听器,参照{@link DemoDataListener}
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* <p>3. 直接读即可
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*/
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@Test
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public void simpleRead() {
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String fileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
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// 这里 需要指定读用哪个class去读,然后读取第一个sheet 文件流会自动关闭
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EasyExcel.read(fileName, DemoData.class, new DemoDataListener()).sheet().doRead();
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}
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```
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## 写Excel
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demo代码地址:[https://github.com/alibaba/easyexcel/blob/master/easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java](https://github.com/alibaba/easyexcel/blob/master/easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java)
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详细文档地址:[https://easyexcel.opensource.alibaba.com/docs/current/quickstart/write](https://easyexcel.opensource.alibaba.com/docs/current/quickstart/write)
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```java
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/**
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* 最简单的写
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* <p>1. 创建excel对应的实体对象 参照{@link com.alibaba.easyexcel.test.demo.write.DemoData}
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* <p>2. 直接写即可
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*/
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@Test
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public void simpleWrite() {
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String fileName=TestFileUtil.getPath()+"write"+System.currentTimeMillis()+".xlsx";
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// 这里 需要指定写用哪个class去读,然后写到第一个sheet,名字为模板 然后文件流会自动关闭
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// 如果这里想使用03 则 传入excelType参数即可
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EasyExcel.write(fileName,DemoData.class).sheet("模板").doWrite(data());
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}
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```
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## web上传、下载
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demo代码地址:[https://github.com/alibaba/easyexcel/blob/master/easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/web/WebTest.java](https://github.com/alibaba/easyexcel/blob/master/easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/web/WebTest.java)
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```java
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/**
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* 文件下载(失败了会返回一个有部分数据的Excel)
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* <p>
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* 1. 创建excel对应的实体对象 参照{@link DownloadData}
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* <p>
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* 2. 设置返回的 参数
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* <p>
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* 3. 直接写,这里注意,finish的时候会自动关闭OutputStream,当然你外面再关闭流问题不大
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*/
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@GetMapping("download")
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public void download(HttpServletResponse response) throws IOException {
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// 这里注意 有同学反应使用swagger 会导致各种问题,请直接用浏览器或者用postman
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response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
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response.setCharacterEncoding("utf-8");
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// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
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String fileName=URLEncoder.encode("测试","UTF-8").replaceAll("\\+","%20");
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response.setHeader("Content-disposition","attachment;filename*=utf-8''"+fileName+".xlsx");
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EasyExcel.write(response.getOutputStream(),DownloadData.class).sheet("模板").doWrite(data());
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}
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/**
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* 文件上传
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* <p>1. 创建excel对应的实体对象 参照{@link UploadData}
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* <p>2. 由于默认一行行的读取excel,所以需要创建excel一行一行的回调监听器,参照{@link UploadDataListener}
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* <p>3. 直接读即可
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*/
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@PostMapping("upload")
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@ResponseBody
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public String upload(MultipartFile file)throws IOException{
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EasyExcel.read(file.getInputStream(),UploadData.class,new UploadDataListener(uploadDAO)).sheet().doRead();
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return"success";
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}
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```
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