easyexcel的使用

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>easyexcel</artifactId>
     <version>2.1.1</version>
 </dependency>

 <dependency>
     <groupId>org.apache.poi</groupId>
     <artifactId>poi-ooxml</artifactId>
     <version>3.17</version>
 </dependency>

 <dependency>
     <groupId>org.apache.poi</groupId>
     <artifactId>poi-ooxml-schemas</artifactId>
     <version>3.17</version>
 </dependency>

 <dependency>
     <groupId>org.apche.poi</groupId>
     <artifactId>poi</artifactId>
     <version>3.17</version>
 </dependency>

package com.example.demo.excel;

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

@Data
public class DemoData {
    
    //设置excel表头名称
    @ExcelProperty(value = "学生编号",index = 0)
    private Integer sno;
    @ExcelProperty(value = "学生姓名",index = 1)
    private String sname;
}

package com.example.demo.excel;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;

import java.util.Map;

public class ExcelListener extends AnalysisEventListener<DemoData> {
    
    //一行一行读取excel内容
    @Override
    public void invoke(DemoData data, AnalysisContext analysisContext) {
    
        System.out.println("****"+data);
    }
    //读取表头内容
    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
    
        System.out.println("表头："+headMap);
    }
    //读取完成之后
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
     }
}

package com.example.demo.excel;

import com.alibaba.excel.EasyExcel;

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

public class TestEasyExcel {
    

    public static void main(String[] args) {
    
        //实现excel写的操作
        //1 设置写入文件夹地址和excel文件名称
        //String filename = "D:\\write.xlsx";
        //2 调用easyexcel里面的方法实现写操作
        //write方法两个参数：第一个参数文件路径名称，第二个参数实体类class
        //EasyExcel.write(filename,DemoData.class).sheet("学生列表").doWrite(getData());


        //实现excel读操作
        String filename = "D:\\write.xlsx";
        EasyExcel.read(filename,DemoData.class,new ExcelListener()).sheet().doRead();
    }

    //创建方法返回list集合
    private static List<DemoData> getData() {
    
        List<DemoData> list = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
    
            DemoData data = new DemoData();
            data.setSno(i);
            data.setSname("lucy"+i);
            list.add(data);
        }
        return list;
    }
}