To see Image-command in action check org.jxls.demo.ImageDemo example in jxls-demo examples. The example demonstrates how to define the Image-command with Java API.
If you wish to use Excel mark-up to define the command it will look like this
jx:image(lastCell="D10" src="image" imageType="PNG")
Here lastCell defines the right bottom cell of the image containing area. If the comment is placed for example in cell A1 then the image will be placed at A1:D10 area in the output Excel. src defines the bean name in the jxls Context containing the image bytes. imageType defines the image type and can be one of the following - PNG, JPEG, EMF, WMF, PICT, DIB. The default value for imageType attribute is PNG. So in the above example we could skip it.
The Java code should contain something like this to put the required image into the Context under image attribute
InputStream imageInputStream = ImageDemo.class.getResourceAsStream("business.png"); byte imageBytes = Util.toByteArray(imageInputStream); context.putVar("image", imageBytes);