You need to ensure that tomcat has rights to read from the directory containing the images.
Next you let this directoryname be known to your application by setting up thru the context param in web.xml file.
And then you can create InputStream to the images in the directory, and use the javax.imageio.ImageIO class's
methods to load the images on the server side if needed or you can simply set the contenttype to the image/xxx
and write the content of the image file to the resopnse's OutputStream.