一、java

1、添加依赖：

<dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.8.16</version>
</dependency>

2、封装方法

import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.IdUtil;
import cn.hutool.poi.excel.BigExcelWriter;
import cn.hutool.poi.excel.ExcelUtil;import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Map;public class ExcelUtils {/*** 导出excel*/public static void downloadExcel(List<Map<String, Object>> list, HttpServletResponse response) throws IOException {String tempPath =System.getProperty("java.io.tmpdir") + IdUtil.fastSimpleUUID() + ".xlsx";File file = new File(tempPath);BigExcelWriter writer= ExcelUtil.getBigWriter(file);writer.write(list, true);response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");//test.xls是弹出下载对话框的文件名，不能为中文，中文请自行编码response.setHeader("Content-Disposition","attachment;filename=file.xlsx");ServletOutputStream out=response.getOutputStream();// 终止后删除临时文件file.deleteOnExit();writer.flush(out, true);//关闭输出Servlet流IoUtil.close(out);}
}

2、接口

@PostMapping("/exportList")
public void exportListData(@RequestBody List<Map<String,Object>> list,HttpServletResponse response){try {ExcelUtils.downloadExcel(list, response);} catch (IOException e) {throw new RuntimeException(e);}
}

二、vue（代码块，仅参考）

1、前端API写法：

export function exportList(data) {return request({url: '/xxx/xxx/exportList/',method: 'post',responseType: "blob",data: data})
}

2、页面调用方法和导出文件

exportList(this.data).then(rsp => {let blob = new Blob([rsp], {type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",});let url = window.URL.createObjectURL(blob);window.location.href = url;this.$message({showClose: true,message: "文件下载成功",type: "success",});});