BufferedImage img = ImageIO.read(file.getInputStream());
        //获取图片的长和宽
        int width = img.getWidth();
        int height = img.getHeight();
        // 调用微信上传图片接口
        // 使用Hutool的HttpUtil上传图片
        JSONObject jsonParam = new JSONObject();
        jsonParam.put("upload_type",0);
        jsonParam.put("resp_type",0);
        jsonParam.put("height",height);
        jsonParam.put("width",width);
        List<String> list = new ArrayList<>();
        for(String key : jsonParam.keySet()){
            list.add(String.format("%s=%s",key,jsonParam.getString(key)));
        }
        String token = TenantTokenCacheUtils.getToken(UserContextHolder.getTenantId());
        String strUrl = String.format("https://api.weixin.qq.com/channels/ec/basics/img/upload?access_token=%s&%s",token,String.join("&",list));
        File tempFile = new File("D:\\temp_image.jpg");

        file.transferTo(tempFile);
        HttpResponse response = HttpUtil.createPost(strUrl)
                .header("content-type", "image/jpg")
                .form("media", tempFile).execute();

postman试过吗