import sun.misc.BASE64Encoder;

import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.OutputStreamWriter;
import java.net.URLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class Twitter {
    public static void main(String[] args) throws Exception {
        if (args.length < 3) {
            System.out.println("Twitter <userid> <password> <message>");
            System.exit(-1);
        }

        URL url = new URL("https://twitter.com/statuses/update.xml");
        URLConnection connection = url.openConnection();

        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setUseCaches(false);

        String authorization = args[0] + ":" + args[1];
        BASE64Encoder encoder = new BASE64Encoder();
        String encoded = new String
                (encoder.encodeBuffer(authorization.getBytes())).trim();
        connection.setRequestProperty("Authorization", "Basic " + encoded);

        OutputStreamWriter out = new OutputStreamWriter(
                connection.getOutputStream());
        out.write("status=" + URLEncoder.encode(args[2], "UTF-8"));
        out.close();

        BufferedReader in = new BufferedReader(
                new InputStreamReader(
                        connection.getInputStream()));
        String response;
        while ((response = in.readLine()) != null) {
            System.out.println(response);
        }
        in.close();

    }
}

<a href=”http://twitter.com/home?status=Currently reading http://www.test.com/post-url” 
title=”Click to share this post on Twitter”>Share on Twitter</a>