Excel的导入与导出2

通过Hutool实现Excel的导入导出

1.引入相关依赖

 
        
            cn.hutool
            hutool-all
            5.7.20
        
        
            org.apache.poi
            poi-ooxml
            4.1.2
        

2. 相关代码

package com.example.demo.demo1;
 
import cn.hutool.core.collection.CollUtil;
import cn.hutool.poi.excel.ExcelReader;
import cn.hutool.poi.excel.ExcelUtil;
import cn.hutool.poi.excel.ExcelWriter;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
 
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;
 
/**
 * @Author: pengke
 * @Date: 2022/9/5 17:46
 * @Description:
 */
@RestController
@RequestMapping("/demo")
public class Demo5 {
 
    //表格导出接口
    @RequestMapping("/export")
    public void export(HttpServletResponse response) throws IOException {
        //查询所有用户
        List list= new ArrayList<>();
        list.add(new User("甲乙丙","123456","甲乙丙"));
        list.add(new User("路飞","123","monkey"));
        //在内存操作，写到浏览器
        ExcelWriter writer= ExcelUtil.getWriter(true);
 
        //自定义标题别名
        writer.addHeaderAlias("username","用户名");
        writer.addHeaderAlias("password","密码");
        writer.addHeaderAlias("nickname","昵称");
        //默认配置
        writer.write(list,true);
        //设置content—type
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset:utf-8");
 
        //设置标题
        String fileName= URLEncoder.encode("用户信息","UTF-8");
        //Content-disposition是MIME协议的扩展，MIME协议指示MIME用户代理如何显示附加的文件。
        response.setHeader("Content-Disposition","attachment;filename="+fileName+".xlsx");
        ServletOutputStream outputStream= response.getOutputStream();
 
        //将Writer刷新到OutPut
        writer.flush(outputStream,true);
        outputStream.close();
        writer.close();
    }
 
    /**
     * 导入excel
     * @param file
     */
    @PostMapping("/import")
    public String importExcel(MultipartFile file) throws IOException {
        //1.第一种 头必须和实体(英文)一样
        //文件处理成io流
        InputStream in = file.getInputStream();
//        //io流给ExcelReader
        ExcelReader excelReader=ExcelUtil.getReader(in);
//        //读取数据且转化为list
//        List list = excelReader.readAll(User.class);
 
        //2.第二种导入方式
        //忽略第一行头(第一行是中文的情况),直接读取表的内容
        List> list = excelReader.read(1);
        List listUser = CollUtil.newArrayList();
        for (List