导入这个依赖

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>3.0.5</version>
</dependency>

参考这个网址

读Excel · 语雀 (yuque.com)https://www.yuque.com/easyexcel/doc/read

@RequestMapping("/uploadByExcel")
public String uploadByExcel(@RequestParam("fileExcel")MultipartFile fileExcel) throws IOException {

    EasyExcel.read(fileExcel.getInputStream(),UserModel.class,new PageReadListener(userInfos->{
        System.out.println(userInfos);
    })).sheet().doRead();
    return fileExcel.getOriginalFilename();
}

@RequestMapping("/writeByExcel")
public String upLoadwriteByExcel() throws IOException {
    EasyExcel.write("C:\\Users\\user\\Desktop\\info.xls", UserModel.class)
            .sheet("模板")
            .doWrite(() -> {
                // 分页查询数据
                return data();
            });

    return "success";
}

private List<UserModel> data() {
    return Arrays.asList(new UserModel("5","小王八","20","男"));
}

package com.javasm.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.read.processor.AnalysisEventProcessor;
import com.javasm.model.UserModel;

import java.util.Map;

public class ExcelListener extends AnalysisEventListener<UserModel> {
    @Override
    public void invoke(UserModel userModel, AnalysisContext context) {
        System.out.println("++++行内容"+userModel);
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        System.out.println("++++++" +analysisContext);
    }

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

package com.javasm.model;

import com.alibaba.excel.annotation.ExcelProperty;

public class UserModel {

    @ExcelProperty(value = "编号",index = 0)
    private String uid;
    @ExcelProperty(value = "姓名",index = 1)
    private String uname;
    @ExcelProperty(value = "年龄",index = 2)
    private String uage;

    @ExcelProperty(value = "性别",index = 3)
    private String usex;

    @Override
    public String toString() {
        return "UserModel{" +
                "uid='" + uid + '\'' +
                ", uname='" + uname + '\'' +
                ", uage='" + uage + '\'' +
                ", usex='" + usex + '\'' +
                '}';
    }

    public UserModel() {
    }

    public UserModel(String uid, String uname, String uage, String usex) {
        this.uid = uid;
        this.uname = uname;
        this.uage = uage;
        this.usex = usex;
    }

    public String getUid() {
        return uid;
    }

    public void setUid(String uid) {
        this.uid = uid;
    }

    public String getUname() {
        return uname;
    }

    public void setUname(String uname) {
        this.uname = uname;
    }

    public String getUage() {
        return uage;
    }

    public void setUage(String uage) {
        this.uage = uage;
    }

    public String getUsex() {
        return usex;
    }

    public void setUsex(String usex) {
        this.usex = usex;
    }
}