EasyExcel官方网站：https://easyexcel.opensource.alibaba.com/

引入依赖

        <!-- EasyExcel依赖 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.1.1</version>
        </dependency>

创建一个实体类操作数据，用@Data简化代码

package com.zeromemos.entity;

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;

@Data
public class ExcelDemoData {

    //设置表头名称
    @ExcelProperty("编号")
    private int id;

    //设置表头名称
    @ExcelProperty("姓名")
    private String name;
}

创建读取操作的监听器ExcelListener，可以定义一些读取时候的操作，这边直接放工具类包里。

package com.zeromemos.utils;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.zeromemos.entity.ExcelDemoData;

import java.util.ArrayList;
import java.util.Map;

public class ExcelListener extends AnalysisEventListener<ExcelDemoData> {

    ArrayList<ExcelDemoData> list = new ArrayList<>();

    //一行一行去读取excel内容
    @Override
    public void invoke(ExcelDemoData data, AnalysisContext analysisContext) {
        System.out.println("***" + data);
        list.add(data);
    }

    //读取excel表头信息
    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
        System.out.println("表头信息" + headMap);
    }

    //读取完成后执行
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        System.out.println("读取完成");
    }

}

直接放测试包里进行测试

run1/2是两种写出到excel的写法，run3/4是两种读excel数据的写法

package code;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelReader;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.read.metadata.ReadSheet;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.zeromemos.entity.ExcelDemoData;
import com.zeromemos.utils.ExcelListener;
import org.junit.Test;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class ExcelTest {

    //创建10个测试数据
    private static List<ExcelDemoData> data(){
        List<ExcelDemoData> list = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            ExcelDemoData data = new ExcelDemoData();
            data.setId(i);
            data.setName("小" + i);
            list.add(data);
        }
        return list;
    }

    @Test
    public void run1(){

        //指定文件保存目录
        String fileName = "C:\\Users\\admin\\Desktop\\demo.xlsx";

        //这里需要指定写用哪个class去写，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
        EasyExcel.write(fileName, ExcelDemoData.class)
                .sheet("写入第一个sheet测试")
                .doWrite(data());
    }

    @Test
    public void run2(){

        //指定文件保存目录
        String fileName = "C:\\Users\\admin\\Desktop\\demo.xlsx";

        //这里需要指定写用哪个class去写
        ExcelWriter excelWriter = EasyExcel.write(fileName, ExcelDemoData.class).build();

        //然后写到第一个sheet，名字为模板
        WriteSheet writeSheet = EasyExcel.writerSheet("写入第一个sheet测试").build();

        //执行写操作
        excelWriter.write(data(), writeSheet);

        //千万别忘记finish会帮忙关闭流
        excelWriter.finish();
    }

    @Test
    public void run3(){
        //指定读取文件
        String fileName = "C:\\Users\\admin\\Desktop\\demo.xlsx";

        //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, ExcelDemoData.class, new ExcelListener())
                .sheet().doRead();
    }

    @Test
    public void run4(){
        //指定读取文件
        String fileName = "C:\\Users\\admin\\Desktop\\demo.xlsx";

        try {
            //创建输入流
            InputStream in = new BufferedInputStream(new FileInputStream(fileName));

            //指定用哪个class去读，和监听器
            ExcelReader excelReader = EasyExcel.read(in, ExcelDemoData.class, new ExcelListener()).build();

            //指定第一个sheet文件
            ReadSheet readSheet = EasyExcel.readSheet(0).build();

            //执行读
            excelReader.read(readSheet);

            //关闭流
            excelReader.finish();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

下面生成的excel文件和读取是打印的效果，打印代码是在监听器ExcelListener里写的