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Display servlet as img src using session attribute
<img src="/displaySessionImage?widgetName=something"/>

protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    HttpSession session = request.getSession();
    String widgetName = request.getParameter("widgetName");

    try {
                    //this is my file manager which was store ealier
        StorageFile file = (StorageFile)session.getAttribute(widgetName);
        response.setContentType(file.getContentType());

                    //the file manager can retrieve input stream
        InputStream in  = file.getInputStream();
        OutputStream outImage = response.getOutputStream();

        byte[]  buf   = new byte[1024];
        int     count = 0;
        while ((count = in.read(buf)) >= 0) {
            outImage.write(buf, 0, count);
        }


    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
 }

InputStream input = uploadedFile.getInputStream();
ByteArrayOutputStream output = new ByteArrayOutputStream();
// Copy bytes from input to output the usual way.
// ...

byte[] content = output.toByteArray();
// Now store it in session.

// ...
response.getOutputStream().write(content);