How to show colors from servlet

Greetings
Please give me a example of how to show color baground and how to show buttons and list objects from servlets.
Thanks in advance

Here is the code sample:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServletSample extends HttpServlet {
public void service(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
    PrintWriter pw = response.getWriter();
    pw.println("<html>");
    pw.println("<head>");
    pw.println("</head>");
    //set background color
    pw.println("<body bgcolor="#99cccc">");
    //list object?
    ServletContext context = getServletContext();
    pw.println(context.getRealPath("/."));
    //create a submit button
    pw.println("<button type=\"submit\">A Submit Button</button>");
    pw.println("</body>");
    pw.println("</html>");
}I recommand to take a tutorial or a book on Servlet

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