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7 months ago
EasyExcel
======================
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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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[![](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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* 官方网站:[https://easyexcel.opensource.alibaba.com/](https://easyexcel.opensource.alibaba.com/)
* github地址:[https://github.com/alibaba/easyexcel](https://github.com/alibaba/easyexcel)
* gitee地址:[https://gitee.com/easyexcel/easyexcel](https://gitee.com/easyexcel/easyexcel)
7 months ago
7 months ago
# JAVA解析Excel工具
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。
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
8 months ago
# 16M内存23秒读取75M(46W行25列)的Excel(3.2.1+版本)
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)
能更快,但是内存占用会在100M多一点
![img](img/readme/large.png)
# 最新版本
```xml
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
6 months ago
<version>4.0.1</version>
</dependency>
```
# 帮忙点个⭐Star
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>
的右上角点个⭐Star,您的支持是使EasyExcel变得更好最大的动力。
# 如何获取帮助
## 优先建议自己通过文档来解决问题
* [快速开始](https://easyexcel.opensource.alibaba.com/docs/current/)
* [常见问题](https://easyexcel.opensource.alibaba.com/docs/qa/)
* [API](https://easyexcel.opensource.alibaba.com/docs/current/api/)
## 其次建议通过`issues`来解决解决问题
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`。
* 去 [github](https://github.com/alibaba/easyexcel/issues) 搜索`issues`
* 去 [gitee](https://gitee.com/easyexcel/easyexcel/issues) 搜索`issues`
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。
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。
`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
加入钉钉或QQ群,看完公告可以获得帮助 。
8 months ago
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。
8 months ago
[QQ1群(已满): 662022184](https://jq.qq.com/?_wv=1027&k=1T21jJxh)
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[QQ8群: 113968681](https://qm.qq.com/q/qwfl5RRBAG)
8 months ago
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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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8 months ago
[钉钉12群(已满):27210038956](https://qr.dingtalk.com/action/joingroup?code=v1,k1,3mKi7VTGlYO+IsDX5n7sYYm2Qrlm220kMBPsJFzKRis=&_dt_no_comment=1&origin=11)
[钉钉13群:83695000992](https://qr.dingtalk.com/action/joingroup?code=v1,k1,2JFUbWfxD1fGiq7LRW+mYjcK7s7onp/s1ZqOvfzkFGE=&_dt_no_comment=1&origin=11)
# 维护者
姬朋飞(玉霄)、庄家钜
# 快速开始
## 读Excel
3 years ago
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)
详细文档地址:[https://easyexcel.opensource.alibaba.com/docs/current/quickstart/read](https://easyexcel.opensource.alibaba.com/docs/current/quickstart/read)
```java
/**
* 最简单的读
* <p>1. 创建excel对应的实体对象 参照{@link DemoData}
* <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}
* <p>3. 直接读即可
*/
@Test
public void simpleRead() {
String fileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
// 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
EasyExcel.read(fileName, DemoData.class, new DemoDataListener()).sheet().doRead();
}
```
## 写Excel
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)
详细文档地址:[https://easyexcel.opensource.alibaba.com/docs/current/quickstart/write](https://easyexcel.opensource.alibaba.com/docs/current/quickstart/write)
```java
/**
* 最简单的写
* <p>1. 创建excel对应的实体对象 参照{@link com.alibaba.easyexcel.test.demo.write.DemoData}
* <p>2. 直接写即可
*/
@Test
public void simpleWrite() {
String fileName=TestFileUtil.getPath()+"write"+System.currentTimeMillis()+".xlsx";
// 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
// 如果这里想使用03 则 传入excelType参数即可
EasyExcel.write(fileName,DemoData.class).sheet("模板").doWrite(data());
}
```
## web上传、下载
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)
```java
/**
* 文件下载(失败了会返回一个有部分数据的Excel)
* <p>
* 1. 创建excel对应的实体对象 参照{@link DownloadData}
* <p>
* 2. 设置返回的 参数
* <p>
* 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
*/
@GetMapping("download")
public void download(HttpServletResponse response) throws IOException {
// 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
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.setCharacterEncoding("utf-8");
// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
String fileName=URLEncoder.encode("测试","UTF-8").replaceAll("\\+","%20");
response.setHeader("Content-disposition","attachment;filename*=utf-8''"+fileName+".xlsx");
EasyExcel.write(response.getOutputStream(),DownloadData.class).sheet("模板").doWrite(data());
}
/**
* 文件上传
* <p>1. 创建excel对应的实体对象 参照{@link UploadData}
* <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}
* <p>3. 直接读即可
*/
@PostMapping("upload")
@ResponseBody
public String upload(MultipartFile file)throws IOException{
EasyExcel.read(file.getInputStream(),UploadData.class,new UploadDataListener(uploadDAO)).sheet().doRead();
return"success";
7 years ago
}
```