Re: OT:News readers..so many to choose from

On Jan 26, 9:36 pm, "Daniel Pitts" <googlegrou...@coloraura.com> wrote:


To follow up. in the last 30 minuts, I wrote a simple Swing application
that will download a list of newsgroups from my local provider, and
display them in a JTree.

It wouldn't be hard to "extend" this to download messages for a
particular group.
My only references were: <http://tools.ietf.org/html/rfc977> and of
course the JDK javadoc.

Less than 100 lines of code too:
<sscce file="GroupSSCCE.java" javac="GroupSSCCE.java" run="java
GroupSSCCE">
import javax.swing.*;
import javax.swing.tree.DefaultTreeModel;
import java.awt.*;
import java.io.*;
import java.util.*;

class GroupSSCCE {
  static final String MESSAGE = "Please enter your nntp server
address";

  public static void main(String[] args) throws Throwable {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    JFrame.setDefaultLookAndFeelDecorated(true);
    JDialog.setDefaultLookAndFeelDecorated(true);
    String host = getHost();

    final GroupNode root = new GroupNode(host);

    final DefaultTreeModel model = new DefaultTreeModel(root);
    final JLabel countLabel = new JLabel("");
    initMainFrame(model, countLabel, host);

    java.net.Socket socket = new java.net.Socket(host, 119);

    BufferedReader in = getIn(socket);
    PrintWriter out = getOut(socket);

    System.out.println(in.readLine());
    out.println("list");
    out.flush();
    System.out.println(in.readLine());

    long count = 0;
    for (String line = in.readLine();
         line.trim().length() > 1;
         line = in.readLine()) {
      addGroup(root,new StringTokenizer(getGroupName(line),
"."),model);
      countLabel.setText("Groups: " + ++count);
    }
    System.out.println("Done!");
  }

  static void addGroup(GroupNode node,
                    StringTokenizer tokenizer, DefaultTreeModel model)
{
    while (tokenizer.hasMoreTokens()) {
      node = node.walkTo(model, tokenizer.nextToken());
    }
  }

  static String getHost() {
    return JOptionPane.showInputDialog(MESSAGE, "news.astound.net");
  }

  static PrintWriter getOut(java.net.Socket socket) throws Throwable {
    return new PrintWriter(socket.getOutputStream());
  }

  static BufferedReader getIn(java.net.Socket socket) throws Throwable
{
    return new BufferedReader(
        new InputStreamReader(socket.getInputStream()));
  }

  static void initMainFrame(final DefaultTreeModel model,
                            final JLabel countLabel, final String
host){
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        final JFrame jframe = new JFrame("Groups: " + host);
        jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jframe.getContentPane().add(new JScrollPane(new JTree(model)),
            BorderLayout.CENTER);
        jframe.getContentPane().add(countLabel, BorderLayout.SOUTH);
        jframe.setLocationRelativeTo(null);
        jframe.pack();
        jframe.setVisible(true);
      }
    });
  }

  static String getGroupName(String line) {
    return new StringTokenizer(line).nextToken();
  }
}

class GroupNode extends javax.swing.tree.DefaultMutableTreeNode {
  HashMap<String, GroupNode> kids = new HashMap<String, GroupNode>();
  GroupNode(String name) {
    super(name, true);
  }
  GroupNode walkTo(DefaultTreeModel model, String child) {
    GroupNode node = kids.get(child);
    if (node == null) {
      node = new GroupNode(child);
      kids.put(child, node);
      add(node);
      model.nodesWereInserted(this, new int[] {children.size()-1});
    }
    return node;
  }
}
</sscce>