RestFB: Using a facebook app to get the users Access Token

This is what i have:

static AccessToken accessToken = new DefaultFacebookClient().obtainExtendedAccessToken("<my app id>", "<my app secret>");
static FacebookClient client = new DefaultFacebookClient();
public static void main(String args[]) {
    System.out.print("Enter Your Status: ");
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    String status= null;

      try {
         userName = br.readLine();
         System.out.println("..........");
      } catch (IOException ioe) {
         System.out.println("!");
         System.exit(1);
      }

    FacebookType publishMessageResponse =
                client.publish("me/feed", FacebookType.class,
                Parameter.with("message", status));

So first line gets the token and stores it as type AccessToken but what good does that do to me because next line i need to provide the access token as a string and i can't convert it. Any Help?

In addition to what Jack said about AccessToken.getAccessToken() returning the string value of accessToken, you can avoid instantiating DefaultFacebookClient twice by extending DefaultFacebookClient like this:

import com.restfb.DefaultFacebookClient;

public class LoggedInFacebookClient extends DefaultFacebookClient {

    public LoggedInFacebookClient(String appId, String appSecret) {
        AccessToken accessToken = this.obtainAppAccessToken(appId, appSecret);
        this.accessToken = accessToken.getAccessToken();
    }

}

First of all don't confuse app token with user token (more info)

To get user token you have to

Provide a way for user to authenticate against Facebook (more info) and receive "code" - an encrypted string unique to each login request.
Get the user token using this code.

You can get user token with pure RestFB the following way:

private FacebookClient.AccessToken getFacebookUserToken(String code, String redirectUrl) throws IOException {
    String appId = "YOUR_APP_ID";
    String secretKey = "YOUR_SECRET_KEY";

    WebRequestor wr = new DefaultWebRequestor();
    WebRequestor.Response accessTokenResponse = wr.executeGet(
            "https://graph.facebook.com/oauth/access_token?client_id=" + appId + "&redirect_uri=" + redirectUrl
            + "&client_secret=" + secretKey + "&code=" + code);

    return DefaultFacebookClient.AccessToken.fromQueryString(accessTokenResponse.getBody());
}

The call is simple:

FacebookClient.AccessToken token = getFacebookUserToken(code, redirectUrl);
String accessToken = token.getAccessToken();
Date expires = token.getExpires();

user2492472

Try the following code:

AccessToken accessToken = new DefaultFacebookClient().obtainAppAccessToken(appid,appsecret);
String token=accessToken.getAccessToken();

Per restfb.FacebookClient.AccessToken, you should be able to call accessToken.getAccessToken() -- that should return the String you are looking for.

This will work

AccessToken accessToken = new DefaultFacebookClient().obtainAppAccessToken("XXXX", "XXXX");
String token=accessToken.getAccessToken();
DefaultFacebookClient facebookClient = new DefaultFacebookClient(token);

来源：https://stackoverflow.com/questions/13671694/restfb-using-a-facebook-app-to-get-the-users-access-token

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