Use Easyexcel to read and write to Excel

Official document: https://www.yuque.com/easyexcel/doc/write#W4u1e

Project structure

Import pom dependencies

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="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>

    <groupId>com.zkd</groupId>
    <artifactId>poi</artifactId>
    <version>1.0-SNAPSHOT</version>


    <dependencies>
        <!--        easyexcel-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.1.7</version>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.18</version>
            <scope>provided</scope>
        </dependency>

<!--        logback-->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
        </dependency>

<!--        fastjson-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.62</version>
        </dependency>

        <!--日期格式化工具-->
        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
            <version>2.10.1</version>
        </dependency>

        <!--junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>



    </dependencies>
</project>

Write to Excel

Create DemoData class

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

import java.util.Date;

@Data
public class DemoData {
    
    
    //自定义标题
    @ExcelProperty("姓名")
    private String name;
    @ExcelProperty("日期")
    private Date date;
    @ExcelProperty("年龄")
    private Integer age;

}

Test code:

import com.alibaba.excel.EasyExcel;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class Text {
    
    

    //文件生成路径
    String path="D:\\idea_gzkj\\Easyexcel\\";

    private List<DemoData> data() {
    
    
        List<DemoData> list = new ArrayList<DemoData>();
            //写数据
            DemoData data = new DemoData();
            data.setName("张三");
            data.setDate(new Date());
            data.setAge(18);
            list.add(data);

        return list;
    }

    /**
     * 最简单的写
     */
    @Test
    public void simpleWrite() {
    
    
        //文件名称
        String fileName = path+"EasyText.xlsx";
        //写
        EasyExcel.write(fileName, DemoData.class).sheet("表名称").doWrite(data());
        System.out.println("写入完成");

    }
}

effect:

Read Excel

Create a parser

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.fastjson.JSON;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Map;

public class DemoDataListener extends AnalysisEventListener<DemoData> {
    
    
    private static final Logger LOGGER = LoggerFactory.getLogger(DemoDataListener.class);

//    invokeHeadMap解析表头数据
    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
    
    
        LOGGER.info("解析到一条头数据:{}", JSON.toJSONString(headMap));
    }

//    invoke解析表头一下的数据
    @Override
    public void invoke(DemoData data, AnalysisContext context) {
    
    
        LOGGER.info("解析到一条数据:{}", JSON.toJSONString(data));
    }

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


}

Test code

import com.alibaba.excel.EasyExcel;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;

@Slf4j
public class Text {
    
    

    //文件路径
    String path="D:\\idea_gzkj\\Easyexcel\\";


    @Test
    public void simpleRead() {
    
    
        //文件路径
        String fileName = path + "EasyText.xlsx";
        //读
        EasyExcel.read(fileName, DemoData.class, new DemoDataListener()).sheet().doRead();
    }
}

effect: