axios文件下载!!!!

前端

download(){
                debugger;
                this.loading = true;
                axios.post('http://localhost:8081/brand_case/dao.do?method=export',this.queryParams,{
                    responseType: 'blob'
                }).then( res=>{
                    console.log('res', res)
                    // var data = res.data.data;
                    // 截取文件名，这里是后端返回了文件名+后缀，如果没有可以自己拼接
                    // 切割出文件名
                    const fileNameEncode = res.headers['content-disposition'].split('filename=')[1]
                    /// 解码
                    const fileName = decodeURIComponent(fileNameEncode)
                    console.log('fileName', fileName)
                        // 设置type类型
                        const blob = new Blob([res.data], {
                            type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet; application/octet-stream'
                        })
                        const fileUrl = window.URL.createObjectURL(blob)
                        let a = document.createElement("a");
                        a.href = fileUrl
                        console.log('url', fileUrl)
                        a.setAttribute('download', fileName)
                        a.style.display = 'none'
                        a.click()
                        a.remove()
                        this.loading = false;
                    }
                )
            }
        }

后端---模板

package com.itheima.pojo;

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import com.alibaba.excel.annotation.write.style.ContentRowHeight;
import com.alibaba.excel.annotation.write.style.HeadRowHeight;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

@NoArgsConstructor
@AllArgsConstructor
@Data
@Builder
@HeadRowHeight(value = 30)
@ContentRowHeight(value = 25)
@ColumnWidth(value = 30)
public class UserExcel {
    @ExcelProperty(value = "用户编号")
    private Integer userId;
    @ExcelProperty(value = "姓名")
    private String username;
    @ExcelProperty(value = "性别")
    private String gender;
    @ExcelProperty(value = "工资")
    private Double salary;
    @ExcelProperty(value = "入职时间")
    private Date hireDate;
}

controller

 // 设置响应头
        resp.setContentType("application/vnd.ms-excel");
        resp.setCharacterEncoding("utf-8");
        // 设置防止中文名乱码
        String filename = URLEncoder.encode("员工信息", "utf-8");
        // 文件下载方式(附件下载还是在当前浏览器打开)
        resp.setHeader("Content-disposition", "attachment;filename=" +
                filename + ".xlsx");
        // 构建写入到excel文件的数据
        List<UserExcel> userExcels = new ArrayList<>();
        UserExcel userExce1 = new UserExcel(1001, "张三", "男", 1333.33,
                new Date());
        UserExcel userExce2 = new UserExcel(1002, "李四", "男", 1356.83,
                new Date());
        UserExcel userExce3 = new UserExcel(1003, "王五", "男", 1883.66,
                new Date());
        UserExcel userExce4 = new UserExcel(1004, "赵六", "男", 1393.39,
                new Date());
        userExcels.add(userExce1);
        userExcels.add(userExce2);
        userExcels.add(userExce3);
        userExcels.add(userExce4);
        // 写入数据到excel
        EasyExcel.write(resp.getOutputStream(), SysOperLog.class)
                .sheet("用户信息")
                .doWrite(logQuery);