facebook-java-api:fql_query返回null

Question

我试图获取已登录在第一名使用fql_query.

我试过了下列代码：

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.http.*;
import javax.servlet.*;
import org.w3c.dom.Document;

import com.google.code.facebookapi.FacebookException;
import com.google.code.facebookapi.FacebookWebappHelper;
import com.google.code.facebookapi.FacebookXmlRestClient;
import com.google.code.facebookapi.IFacebookRestClient;
import org.json.JSONException;


public class Canvas extends HttpServlet {

     private static final String FACEBOOK_USER_CLIENT = "facebook.user.client";
    private String api_key=<API_KEY>;
    private String secret=<SECRET>;


  @Override
    public void doGet (HttpServletRequest req,
                                     HttpServletResponse res)
    throws ServletException, IOException
  {
                    HttpServletRequest request = (HttpServletRequest)req;
                    HttpServletResponse response = (HttpServletResponse)res;

                    HttpSession session = request.getSession(true);
                    IFacebookRestClient<Document> userClient = getUserClient(session);
                    if(userClient == null) {
                      //  logger.debug("User session doesn't have a Facebook API client setup yet. Creating one and storing it in the user's session.");
                        userClient = new FacebookXmlRestClient(api_key, secret);
                        session.setAttribute(FACEBOOK_USER_CLIENT, userClient);
                    }
 FacebookWebappHelper<Document> facebook = new FacebookWebappHelper<Document>(request,      response, api_key, secret, userClient);
                    String nextPage = request.getRequestURI();
                    nextPage = nextPage.substring(nextPage.indexOf("/", 1) + 1); //cut out the first /, the context path and the 2nd /
            //      logger.trace(nextPage);
                    boolean redirectOccurred = facebook.requireLogin(nextPage);
                    if(redirectOccurred) {
                            return;
                    }
                    redirectOccurred = facebook.requireFrame(nextPage);
                    if(redirectOccurred) {
                            return;
                    }

                    long facebookUserID;
                    try {
                         facebookUserID = userClient.users_getLoggedInUser();
                    } catch(FacebookException ex) {
                        response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,  "Error while fetching user's facebook ID");
/*                          logger.error("Error while getting cached (supplied by request params) value " +
                                         "of the user's facebook ID or while fetching it from the Facebook service " +
                                         "if the cached value was not present for some reason. Cached value = {}", userClient.getCacheUserId());*/
                        return;
                    }
                      PrintWriter out = res.getWriter();
        String query = "Select name from user where uid=" + facebookUserID;
        Document fqlDocument=null;
        try {
        fqlDocument = userClient.fql_query(query);
        } catch (FacebookException e) {
            out.println("error");
        }
    out.println("Hello, Brave new World: " + facebookUserID + " " +  fqlDocument);
    out.close();



  }
  public static FacebookXmlRestClient getUserClient(HttpSession session) {
        return (FacebookXmlRestClient)session.getAttribute(FACEBOOK_USER_CLIENT);
    }

}

这造成输出为：

Hello, Brave new World: <MY_UID>[#document: null]

我保证，uid，我收到的是正确的。使用facebook-java-api3.0.2(最新版)

1. 为什么我得到一个空的文件查询的?
2. 为什么查询不扔任何相关的异常，如果有一个问题吗？
3. 这是一种代码，我在网络上找到，是否有任何更好的方法来实现我的目标？

谢谢你的一切！

我真的在这个新的主题这样我向你道歉的任何联合国相关的问题或关于这个主题的资料。

Answer 1

我解决这个问题通过使用TinyFBClient而不是facebook-java-api。

tinyFbClient允许发送的实际facebook api命令这让我得到一个所有相关信息，对我的应用程序，而不使用fql查询。

facebook api: http://wiki.developers.facebook.com/index.php/API

tinyFBClient: http://www.socialjava.com/

代码样本：

HttpServletRequest request = (HttpServletRequest)req;
String sessionKey = request.getParameter("fb_sig_session_key");
TinyFBClient fb = new TinyFBClient(this.api_key,this.secret,sessionKey);
TreeMap tm = new TreeMap();

tm.put("uid","");

String friendList = fb.call("friends.get", tm);

PrintWriter out = res.getWriter();
out.println(friendList);

out.close();

}