如何使用Facebook4j登录Facebook

Question

I am developing a photo viewer, which is a java desktop application and to integrate it with facebook I am using the Facebook4J library. But I am clueless as to where to provide the username and password for the user....

I am using the following code :

public static  Configuration createConfiguration() {
    ConfigurationBuilder confBuilder = new ConfigurationBuilder();

    confBuilder.setDebugEnabled(true);
    confBuilder.setOAuthAppId("************");
    confBuilder.setOAuthAppSecret("***************");
    confBuilder.setUseSSL(true);
    confBuilder.setJSONStoreEnabled(true);
    Configuration configuration = confBuilder.build();
    return configuration;
}
public static void main(String[] argv) throws FacebookException {
    Configuration configuration =  createConfiguration();
    FacebookFactory facebookFactory = new FacebookFactory(configuration );
    Facebook facebookClient = facebookFactory.getInstance();
    AccessToken accessToken = null;
    try{
        OAuthSupport oAuthSupport = new OAuthAuthorization(configuration );
        accessToken = oAuthSupport.getOAuthAppAccessToken();

    }catch (FacebookException e) {
        System.err.println("Error while creating access token " + e.getLocalizedMessage());
    }
    facebookClient.setOAuthAccessToken(accessToken);
//results in an error says {An active access token must be used to query information about the current user}
    facebookClient.postStatusMessage("Hello World from Facebook4J."); 
}

How to pass the username and password the user?

Answer 1

You should retrieve an OAuthAppId from facebook. To do this, create an App on Facebook Developers and click "Create new app". Fill in the form, then copy paste the AppId and Appsecret from the page that appears in your code. Example:

confBuilder.setOAuthAppId("YOUR APPID HERE");
confBuilder.setOAuthAppSecret("YOUR APPSECRET HERE");

To get the AccessToken, you have to build a login flow as described here