a Little NNTP Example

This code provides NNTP server-client connection,

to join a group after that

to print the last article header of the group.

import org.apache.commons.net.nntp.*;
import java.io.*;
import java.util.*;
public class NNTPExample {

 // the method parses the reply code that from nntp server
 public static ArticlePointer getLastArticle(String replyString) {
 StringTokenizer strToken = new StringTokenizer(replyString);
 int status = Integer.parseInt(strToken.nextToken());
 // the status 211 means group selected
 if (status == 211) {
     int articleCount = Integer.parseInt(strToken.nextToken());
     int firstArticle = Integer.parseInt(strToken.nextToken());
     int lastArticle = Integer.parseInt(strToken.nextToken());
     String groupName = strToken.nextToken();
     ArticlePointer ap = new ArticlePointer();
     ap.articleNumber = lastArticle;
     return ap;
 }
 return null;
 }
 // the method parses the article subject and converts to string
 public static String getArticleSubject(Reader r) {
 StringBuffer sb = new StringBuffer();
 try {
     BufferedReader br = new BufferedReader(r);
     String line = br.readLine();
     while (line != null) {
        if (line.indexOf("Subject:") != -1) {
           return line.substring(line.indexOf(':') + 1);
        }
     line = br.readLine();
     }
 } catch (Exception e) {
     e.printStackTrace();
 }
 return null;
 }

 public static void main(String[] args) {
 try {
     NNTPClient client = new NNTPClient();

     // server connection, 119 is default NNTP port number
     client.connect("your_server_ip", 119);

     // group selection 
     boolean status = client.selectNewsgroup("to_attend_group_name");
     ArticlePointer ap = getLastArticle(client.getReplyString());
     System.out.println(ap.articleNumber
        + ": "
        + getArticleSubject(client
        .retrieveArticleHeader(ap.articleNumber)));

     client.logout();
     client.disconnect();
 } catch (Exception e) {
     e.printStackTrace();
 }
}

}