echarts图表如何导出到excel中

<div>
    <button onclick="export1()"  value="导出">导出</button> </div>
    <div id="app" >
    </div>
</body>

<!-- 引入组件库 -->
<script src="../js/echarts.js"></script>
<script src="../js/vue.js"></script>
<script src="../js/axios-0.18.0.js"></script>
<script>
// 基于准备好的dom，初始化echarts实例
    var myChart = echarts.init(document.getElementById('app'));

    // 指定图表的配置项和数据
    var option = {
        title: {
            text: 'ECharts 入门示例'
        },
        tooltip: {},
        legend: {
            data:['销量','销售额']
        },
        xAxis: {
            data: ["衬衫","羊毛衫","雪纺衫","裤子","高跟鞋","袜子","帽子"]
        },
        yAxis: {},
        series: [
            {
                name: '销量',
                type: 'bar',
                data: [5, 20, 36, 10, 10, 20,100]
            },
            {
                name: '销售额',
                type: 'bar',
                data: [50, 200, 360, 100, 100, 200,1000]
            }]
    };
    // 使用刚指定的配置项和数据显示图表。
    myChart.setOption(option);
</script>

    /**
     * 导出excel中
     */
    function export1() {
        //获取echarts图片的base64编码字符串 pixelRatio：图片精度  backgroundColor：背景颜色
       let imgURL=myChart.getDataURL({
            pixelRatio: 2,
            backgroundColor: '#fff'
        });
        //后台请求：传递图表base64编码字符串
        axios.post("/export.do",{'imagesBase64':imgURL}).then((res)=>{
            if(res.data.flag){
                //根据返回路径下载文件
                window.location.href=res.data.message;
            }else{
                alert("导出出错")
            }
        })

    }

  @PostMapping("export")
    public Result ex(@RequestBody Map<String,String> map,HttpServletRequest request){
        //创建工作簿
        XSSFWorkbook workbook = new XSSFWorkbook();
        //工作表
        XSSFSheet sheet = workbook.createSheet("echarts图表");

        //获取前端图片base64编码
        String base64 = map.get("imagesBase64");
        //去掉标识22位，解码
        byte[] img=decode(base64.substring(22));
        //在工作表中画图
        XSSFDrawing xssfDrawing = sheet.createDrawingPatriarch();
        //画图位置，前四个参数： 单元格位置，距离left，top，right，bottom的像素距离，
        //后四个参数是: 前两个表示 左上角 列号、行号，  右下角 列号、行号
        XSSFClientAnchor clientAnchor=new XSSFClientAnchor(0,0,0,0,0,0,10,20);
        //根据指定位置来画图
        xssfDrawing.createPicture(clientAnchor,workbook.addPicture(img,XSSFWorkbook.PICTURE_TYPE_PNG));
        //获取模板位置
        String templatesPath = request.getSession().getServletContext().getRealPath("templates")+File.separator+"haha.xlsx";
        File file = new File(templatesPath);
        if(file.exists()){
            file.delete();
        }
        //输出到模板中
        BufferedOutputStream out=null;
        try {
            out=new BufferedOutputStream(new FileOutputStream(templatesPath));
            workbook.write(out);
            out.flush();
        }catch (Exception e){
            e.printStackTrace();
            return Result.fail("导出失败");
        }finally {
            //释放资源
            try {
                if(out!=null){
                   out.close();
                }
                if(workbook!=null){
                    workbook.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        //返回模板位置
        String s = request.getContextPath() + File.separator + "templates" + File.separator + "haha.xlsx";
        return Result.success(s);
    }