Obtener un post de una página de Facebook

gistfile1.java

package test;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import org.json.JSONObject;
import org.json.JSONTokener;

public class Test {
    static String appId = "[APP_ID_HERE]",
      	appSecret = "[APP_SECRET_HERE]",
    	pageId = "[PAGE_ID_HERE]",
    	token, targetURL = "https://graph.facebook.com/%s/posts?fields=message,type&limit=1&";
    
    public static void main(String[] args) {
    	String[] post = getLastFBPost();
    	if(post != null){
    	    System.out.println(post[0]);
    	}
    }
    public static String[] getLastFBPost() {
	    String[] result = new String[3];
    	try {
    		// Get authorization token
    		token = getFacebookToken(appId, appSecret);
    		if(token == null){
    			System.out.println("Failed retrieving token");
    			return null;
    		}
    		
    		// Create connection
    		URL url = new URL(String.format(targetURL, pageId) + token);
    		
    		JSONObject root = (new JSONObject(new JSONTokener(url.openStream()))).getJSONArray("data").getJSONObject(0);
    		
    		result[0] = root.getString("message");
    		result[1] = root.getString("type");
    		result[2] = root.getString("created_time");
    		
    		return result;
    	} catch (Exception e) {
    		e.printStackTrace();
    		return null;
    	}
    }
    public static String getFacebookToken(String appId, String appSecret){
    	String token;
    	HttpURLConnection connection = null;
	    try {
    		// Create connection
    		URL url = new URL("https://graph.facebook.com/oauth/access_token?client_id=" + appId + "&client_secret=" + appSecret + "&grant_type=client_credentials");
    		connection = (HttpURLConnection) url.openConnection();
    		
    		// Get the response
    		BufferedReader rd = new BufferedReader(new InputStreamReader(connection.getInputStream()));
    		StringBuilder sb = new StringBuilder();
    		String line;
    		while ((line = rd.readLine()) != null) {
    			sb.append(line);
    		}
    		rd.close();
    		token = sb.toString();
	    } catch(Exception e) {
	    	return null;
	    } finally {
	    	if(connection != null) {
    	        connection.disconnect(); 
    	    }
	}   
	return token;
    }
}