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JavaからTwitterに投稿するプログラム

※20091126間違っていたので直しました

import java.net.*;
import java.io.*;
import java.net.Authenticator;
import java.net.PasswordAuthentication;
public class Twitter {
    public static void main(String[] args) throws Exception {
        String username = args[0];
        String password = args[1];
        String message = args[2];
        HttpAuthenticator http_authenticator = new HttpAuthenticator(username, password);
        Authenticator.setDefault(http_authenticator);
        URL url = new URL("https://twitter.com/statuses/update.xml");
        HttpURLConnection con = (HttpURLConnection)(url.openConnection());
        con.setRequestMethod("POST");
        con.setDoOutput(true);
        con.connect();
        PrintWriter out = new PrintWriter(con.getOutputStream());
        String message_str = "status=" + URLEncoder.encode(message,"UTF-8");
        out.print(message_str);
        out.close();
        if(con.getResponseCode()!=HttpURLConnection.HTTP_OK)
            System.out.println(con.getResponseCode());
        con.disconnect();
    }
}   
 class HttpAuthenticator extends Authenticator {
     private String username;
     private String password;
     public HttpAuthenticator(String username, String password){
         this.username = username;
         this.password = password;
     }
     protected PasswordAuthentication getPasswordAuthentication(){
         return new
             PasswordAuthentication(username, password.toCharArray());
     }
     public String myGetRequestingPrompt(){
         return super.getRequestingPrompt();
     }
 }