使用Spring Mvc从服务器加载图像时如何创建进度条

I'm trying to insert an Progress Bar (it doesn't need to show how much of the file is downloaded until the moment, it just need to show that the page is waiting for the load) in my JSP file while an file is loaded. I've seen this site to create and .git which would be my progress bar. I'm trying to insert an Progress Bar (it doesn'