Posting to a Facebook page via OpenGraph

through all the articles and guides, I can't seem to figure out how to authenticate with Facebook so that I could post from our website to our Facebook page. Can you please give me some sort of "how to do exactly this for dummies"? The main thing is that I can't figure out how to get that acces_token. The questions are:

1. do 开发者_如何学JAVAI need to create some sort of facebook application first?
2. will the app post to the page's wall as a page admin would, or as an application, in other words - how to do it as a page admin?

Yes, you have to create a Facebook application in order to let the users of your website post their stuff on Facebook.

The authenticate process, using OAuth 2.0, is quite simple:

• call https://graph.facebook.com/oauth/authorizeclient_id=<your app's client_id>&redirect_uri=<your redirect URU>. As you can see, you have to transmit your client_id and an URI where Facebook will redirect at the end of the process. You can also transmit a data parameter, which will go unchanged through the process. Useful to keep track of the user.
• call https://graph.facebook.com/oauth/access_token?client_id=<your app's client_id>&redirect_uri=h<your redirect URU>&client_secret=<your app's client_secret>&code=<code> The code parameter is given by the call to the redirect URI on the previous step
• call https://graph.facebook.com/me?access_token=<access_token>, using the ad-hoc access_token returned by the previous redirect, and then you get the real access_token.

More infos here:

http://developers.facebook.com/docs/authentication/

You need to find out your user id and an access token from the opengraph explorer

The following Java code (using apache http client), publishes a message on the facebook wall of the user id specified.

public class Main2 {

    public static void main(String[] args) {



        HttpClient httpclient = new DefaultHttpClient();

        try {


            String accessToken = "AAACEdEose0cBANzDaBq";

            String message = "Hey Jude, don't make it bad";

            String userId = "200501511023";

            String requestURL = "https://graph.facebook.com/"+userId+"/feed";

            HttpPost httpPost = new HttpPost( requestURL );

            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
            nameValuePairs.add(new BasicNameValuePair("access_token", accessToken));
            nameValuePairs.add(new BasicNameValuePair("message", message));


            httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));


            // Create a response handler
            ResponseHandler<String> rh = new ResponseHandler<String>() {

                public String handleResponse(HttpResponse hr) throws ClientProtocolException, IOException {
                    return "\n" + hr.getStatusLine() + "\n\n"
                        + dumpStream(hr.getEntity().getContent());
                }
            };

            System.out.println("****************************************");
            System.out.println("executing request " + httpPost.getURI());
            System.out.println("****************************************");

            String response = httpclient.execute(httpPost, rh);


            System.out.println("----------------------------------------");
            System.out.println(response);
            System.out.println("----------------------------------------");


        } catch (IOException e) {
            e.printStackTrace();
        }
    }

     public static String dumpStream(InputStream is) {
    try {

        byte[] theBytes = new byte[is.available()];
        is.read(theBytes, 0, is.available());
        is.close();
        return new String(theBytes);
    } catch (IOException ex) {
    }
    return null;
} // ()
}  // class