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midrange.com
> From: "Hans Boldt" <boldt@xxxxxxxxxx>
> Applications written using a framework like J2EE (among others)
> naturally fit into an MVC framework, since different tools are used
> for each component.
I wouldn't agree that J2EE applications naturally fit into an MVC design
pattern. Consider the following Servlet example from Sun's tutorial:
import java.io.*;
import javax.servlet.*;
public class SampleServlet implements Servlet {
private ServletConfig config;
public void init (ServletConfig config)
throws ServletException {
this.config = config;
}
public void destroy() {} // do nothing
public ServletConfig getServletConfig() {
return config;
}
public String getServletInfo() {
return "A Simple Servlet";
}
public void service (ServletRequest req,
ServletResponse res
) throws ServletException, IOException {
res.setContentType( "text/html" );
PrintWriter out = res.getWriter();
out.println( "<html>" );
out.println( "<head>" );
out.println( "<title>A Sample Servlet</title>" );
out.println( "</head>" );
out.println( "<body>" );
out.println( "<h1>A Sample Servlet</h1>" );
out.println( "</body>" );
out.println( "</html>" );
out.close();
}
}
In a more complex example, database I/O logic might have also been embedded
in the service method along with the UI logic.
Similarly, one might find UI control and DB I/O logic embedded in a JSP
page.
My point is that J2EE, like ILE CGI, leaves it up to the programmer to
implement MVC design. CGIDEV2 and other ILE frameworks support MVC design
just as much as J2EE does, through HTML templates, and the ability to place
DB I/O logic in ILE modules separate from control logic.
At least we both agree that MVC design is very important ;-)
Nathan M. Andelin
www.relational-data.com
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