spring boot生成随机四位字符的验证码图片由vue前端获取使用

BufferedImage bufferedImage = new BufferedImage(100,50,BufferedImage.TYPE_INT_BGR);
log.info("创建画板开始------------------");
Graphics2D graphics = bufferedImage.createGraphics();

log.info("设置背景颜色------------------");
graphics.setColor(Color.WHITE);

graphics.setBackground(Color.WHITE);

graphics.fillRect(0,0,100,50);
List list = new ArrayList<>();

Random random = new Random();

log.info("生成随机数------------------");
for(int i = 0 ; i < 4; i ++){
    list.add(data[random.nextInt(data.length)]);
}

log.info("设置字体，形状，大小------------------");
graphics.setFont(new Font("宋体",Font.BOLD|Font.ITALIC,20));
Color [] c = new Color[]{
        Color.BLUE,Color.PINK,Color.RED,Color.YELLOW,Color.GREEN
};

log.info("写数据到图片指定位置------------------");
for(int i = 0;i 

created:function () {
      console.log(111111);
    axios.get("/api/dxq/getCode",{responseType: 'blob'}).then(res=>{
       console.log(res.data);
        console.log(window.URL.createObjectURL(res.data));
       this.codeUrl = window.URL.createObjectURL(res.data);
//       this.routers = res.data.data;
   }).catch(err=>{
       alert("查询出错！");
   });


  }