apache commons nntp

gistfile1.java

thufir@dur:~$ 
thufir@dur:~$ java -jar NetBeansProjects/Gwene/dist/Gwene.jar 
Gwene...
Settings...
initialize..
200 Leafnode NNTP Daemon, version 1.11.8 running at localhost (my fqdn: dur.bounceme.net)
GROUP comp.lang.java.help
211 37 3 39 comp.lang.java.help group selected
XOVER 1-9
224 Overview information for postings 3-9:
..initialize
subjects...
Re: Is there any specific book for learning java projects for beginners?
Validating form inputs?
Re: Validating form inputs?
Re: Validating form inputs?
Re: Validating form inputs?
Re: Validating form inputs?
Re: Validating form inputs?
...Gwene
thufir@dur:~$ 
thufir@dur:~$ cat NetBeansProjects/Gwene/src/gwene/NNTPUtils.java 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package gwene;

import java.io.IOException;
import java.io.PrintWriter;
import static java.lang.System.out;
import java.net.SocketException;
import java.util.logging.Logger;
import org.apache.commons.net.PrintCommandListener;
import org.apache.commons.net.nntp.Article;
import org.apache.commons.net.nntp.NNTPClient;
import org.apache.commons.net.nntp.Threader;

/**
 *
 * Some convenience methods for NNTP example classes.
 *
 * @author Rory Winston <rwinston@checkfree.com>
 */
public class NNTPUtils {

    private static NNTPClient client = null;
    //private static List<Article> articles = null;
    private static final Logger logger = Logger.getLogger(NNTPUtils.class.getName());
    private static final Settings settings = null;
    private static Iterable<Article> articles = null;

    public static void initialize(Settings settings) throws SocketException, IOException {
        out.println("initialize..");
        client = new NNTPClient();
        client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out), true));
        client.connect(settings.getServer());
        client.group(settings.getGroup());
        articles = client.iterateArticleInfo(settings.getLowArticleNumber(), settings.getHightArticleNumber());
        out.println("..initialize");
    }

    public static void Thread() throws IOException {
        System.out.println("Building message thread tree...");
        Threader threader = new Threader();
        Article root = (Article) threader.thread(articles);
        Article.printThread(root, 0);
    }

    public static void subjects() {
        out.println("subjects...");
        for (Article article : articles) {
            if (article.isDummy()) { // Subject will contain raw response
                System.out.println("Could not parse: " + article.getSubject());
            } else {
                System.out.println(article.getSubject());
            }
        }
    }
}
thufir@dur:~$ 
thufir@dur:~$ 
thufir@dur:~$ telnet localhost nntp
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
200 Leafnode NNTP Daemon, version 1.11.8 running at localhost (my fqdn: dur.bounceme.net)
group comp.lang.java.help
211 37 3 39 comp.lang.java.help group selected
next
223 4 <ed7f31e9-8a19-46c7-9a7c-ad8aabfb9599@x10g2000pbi.googlegroups.com> article retrieved
body
222 4 <ed7f31e9-8a19-46c7-9a7c-ad8aabfb9599@x10g2000pbi.googlegroups.com> article retrieved - body follows
I have been thinking about the way I have been validating form inputs
in the servelet and wonder if I would be much better off using class
methods to verify these inputs?

Consider that I am almost always gathering the inputs to instantiate
one or more objects, but I gather and validate -- and then
instantiate. Maybe I should instantiate an empty object and then use
class methods to validate the inputs?

Thanks
.
next
223 5 <uA4ar.13560$fj7.13111@newsfe20.iad> article retrieved
body
222 5 <uA4ar.13560$fj7.13111@newsfe20.iad> article retrieved - body follows
On 3/20/12 11:16 AM, Davej wrote:
> I have been thinking about the way I have been validating form inputs
> in the servelet and wonder if I would be much better off using class
> methods to verify these inputs?
>
> Consider that I am almost always gathering the inputs to instantiate
> one or more objects, but I gather and validate -- and then
> instantiate. Maybe I should instantiate an empty object and then use
> class methods to validate the inputs?
>
> Thanks
There are a few frameworks that do this in several phases actually. Its 
called binding and validating.

In the binding phase, values are parsed into appropriate data types, and 
stored in the model (Form object as it is sometimes called).  If the 
data can not be parsed, or the model rejects the value immediately, it 
is a binding error.

In the validation phase, the values are checked for correctness. This is 
often a secondary phase because some values are interdependent.

If, after validation, you want to have an immutable object, then you 
could treat your Form object more as a Builder object, and have it 
construct the Real object, which is fully populated and validated. 
Alternatively, you could use the Form object as a "Parameter" object for 
a different Builder class, to keep the concerns of the Form object more 
pure.

I suggest looking into different frameworks, rather than trying to 
roll-your-own. There are a lot of gotchas that can be avoided, and 
boilerplate code you can rid yourself of.  I've had moderate luck with 
Spring Binding.  If you have typical use-cases it works well.  If you 
have more complicated forms, for instance complex dynamic items, then 
there is some shoehorning needed to make it work correctly.

Hope this helps,
Daniel.
.
quit
205 Always happy to serve!
Connection closed by foreign host.
thufir@dur:~$ 
thufir@dur:~$