Threadbare Canvas Productions

Today I’m going to show you some sample code regarding how to send a tweet to twitter using twitter4j and OAuth. The following code example is a command line twitter client that authenticates a user with oAuth and allows them to post a tweet.

All you need to to create a project in your favourite IDE.. for ease of use. Add the twitter4j library to your build path. Compile and run. If you run into any problems shoot them into the comments and I’ll lend a hand. Happy hacking.

package com.auth;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.logging.Level;
import java.util.logging.Logger;
import twitter4j.Status;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.User;
import twitter4j.http.AccessToken;
import twitter4j.http.RequestToken;

public class Main {

    public static void main(String args[])
    {
        try
        {
            // The factory instance is re-useable and thread safe.
            Twitter twitter = new TwitterFactory().getInstance();
            twitter.setOAuthConsumer("pESR4xRk4glcGKMCryvdMQ", "ddu3r7IRp0I1luSFOW2iLwKP5pYTY03AZrAjJAVaj8");

            RequestToken requestToken = twitter.getOAuthRequestToken();
            AccessToken accessToken = null;
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            while (null == accessToken)
            {
                System.out.println("Open the following URL and grant access to your account:");
                System.out.println(requestToken.getAuthorizationURL());
                System.out.print("Enter the PIN(if aviailable) or just hit enter.[PIN]:");
                String pin = null;
                try
                {
                    pin = br.readLine();
                } catch (IOException ex)
                {
                    Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
                }
                try
                {
                    if (pin.length() > 0)
                    {
                        accessToken = twitter.getOAuthAccessToken(requestToken, pin);
                    } else
                    {
                        accessToken = twitter.getOAuthAccessToken();
                    }
                } catch (TwitterException te)
                {
                    if (401 == te.getStatusCode())
                    {
                        System.out.println("Unable to get the access token.");
                    } else
                    {
                        te.printStackTrace();
                    }
                }
            }
            //persist to the accessToken for future reference.
            storeAccessToken(twitter.verifyCredentials(), accessToken);
            Status status = twitter.updateStatus(args[0]);
            System.out.println("Successfully updated the status to [" + status.getText() + "].");
            System.exit(0);
        } catch (TwitterException ex)
        {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    private static void storeAccessToken(User user, AccessToken accessToken)
    {
        System.out.println(user.getScreenName());
    }
}

Posted by Siriquelle
Category: Java, OAuth, Twitter