使用 facebook java api 获取 facebook 好友答案

【问题标题】：Fetching facebook friends by using facebook java api使用 facebook java api 获取 facebook 好友
【发布时间】：2011-09-24 14:23:46
【问题描述】：

我的任务是这样的：-

1) 从我的应用程序成功登录并检索用户朋友的姓名 2）在网页上显示所有朋友（html），每个朋友都有一个对应的cheakboxes。（列表视图） 3）我们应该能够在选定的朋友上发布消息 4）提交/发送墙按钮。

所以我决定编写一个 sevlet 来发出请求（敌人登录）并检索朋友列表，如下所示

public class Servletfb extends HttpServlet {
private static final long serialVersionUID = 1L;
private String API_KEY="1c36b59974ca90e4cefaa1f5c8e18edf";
private String SECRET_KEY="77f2d4df446ac8ae8b35b008da3d6070";

/**
 * Default constructor. 
 */
public Servletfb() {
    // TODO Auto-generated constructor stub
}

/**
 * @see Servlet#init(ServletConfig)
 */
public void init(ServletConfig config) throws ServletException {
    // TODO Auto-generated method stub

      IFacebookRestClient client = new FacebookXmlRestClient(API_KEY,
                    SECRET_KEY);

            try {
                String token = client.auth_createToken();
                String url = "http://www.facebook.com/login.php?api_key=" + API_KEY
                        + "&v=1.0" + "&auth_token=" + token;
                System.out.println(url);
                Runtime.getRuntime().exec("explorer \"" + url + "\""); 

                System.out.println("Use browser to login then press return");
                System.in.read();

                String session = client.auth_getSession(token);
                System.out.println("Session key is " + session);

                client.friends_get();

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

}

但我遇到了类似的异常

javax.servlet.ServletException: Error instantiating servlet class com.vibhor.Servletfb
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)

我正在使用 Tomcat Server 和 facebook java 3.0.2 api

正如我提到我的要求，什么是实现这一目标的最佳方法，因为我被困在非常初始的阶段？任何帮助都会得到帮助......

{编辑} 我将代码放入 doPost() 并且堆栈跟踪是：-

java.lang.NoClassDefFoundError: com/google/code/facebookapi/FacebookException
at java.lang.Class.getDeclaredConstructors0(Native Method)
na.at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:255)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3709)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4356)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: java.lang.ClassNotFoundException:      com.google.code.facebookapi.FacebookException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1360)
at org.apache.cataliloader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)

[编辑]

好的...它似乎不起作用，所以我切换到 facebook rest api，并写了这样的东西：

public static void main(String[] args)
{

    FacebookClient facebookClient = new DefaultFacebookClient(args[0]);
User user = facebookClient.fetchObject("me", User.class);
System.out.println("User name: " + user.getName());
Connection<User> myFriends = facebookClient.fetchConnection("me/friends",    User.class);
System.out.println("Count of my friends: " + myFriends.getData().size());
              System.out.println(myFriends.toString());
}

我的输出是 json 格式的朋友列表：

INFO: Facebook responded with HTTP status code 200 and response body: {"data":  [{"name":"Wasim Sama","id":"550332915"},{"name":"Ujjwal Mishra","id":"599310869"},{"name":"Rj Priyanka","id":"764454678"},{"name":"Paras Arora","id":"778875857"},{"name":"Harshit Makkar","id":"1012133181"},{"name":"Sudhanshu Shukla","id":"1019487229"},{"name":"Vikas Jain","id":"1023819462"},{"name":"Vijay Boregowda","id":"1039516000"},{"name":"Tulika Gera","id":"1097057138"},{"name":"Deepak Kumar R","id":"1132446570"},{"name":"Nitin Goyal","id":"1247507205"},{"name":"Romil Choudaha","id":"1447479935"},{"name":"Saumil Gupta","id":"1501336418"},{"name":"Vebhav Gupta","id":"1507248199"},{"name":"Ashish Vimal","id":"1508694554"},{"name":"Utkarsh Singh","id":"1574203311"},{"name":"Varun Kumar","id":"1623342038"},{"name":"Pradeep Kumar Krishnia","id":"1632769647"},{"name":"Girish Grover","id":"1647181709"},{"name":"Gaurav Gopalia","id":"1661547047"},{"name":"Rajendra Kasana","id":"1664287122"},{"name":"Avdhesh Dubey","id":"1794517002"},{"name":"Shivendra Mathur","id":"1835574934"},{"name":"Vasu Jain","id":"100000009957578"},{"name":"Punit Agrawal","id":"100000118068889"},{"name":"Ramakant Jaiman","id":"100000155434269"},{"name":"Ankit Sharma","id":"100000193433562"},{"name":"Anuj Jain","id":"100000489571784"},{"name":"Camille Ali","id":"100000603236882"},{"name":"Ankur Sharma","id":"100000702407825"},{"name":"Ashutosh Kumar","id":"100000705998842"},{"name":"Prarit Gupta","id":"100000747266879"},{"name":"Amit Gupta","id":"100000781280458"},{"name":"Govind Sharma","id":"100000819234210"},{"name":"Vijay Saini","id":"100000872004792"},{"name":"Rahul Kumar","id":"100001055753094"},{"name":"Krishan Agarwal","id":"100001091775590"},{"name":"Vaibhav Singh","id":"100001147539787"},{"name":"Arvind Kumar Singh","id":"100001492873242"},{"name":"Rajendra Gupta","id":"100001502173655"},{"name":"Ajay Kumar Tiwari","id":"100001520262873"},{"name":"Alok Rai","id":"100001561421479"}]}

如何从 json 对象中检索名称并将它们显示在 html 页面上，因为我没有使用 json 的经验，这对我来说似乎有点棘手......有什么帮助吗？？

【问题讨论】：

如果没有堆栈跟踪，这很难诊断，但我可以肯定地告诉您，您不应该从init 方法启动explorer 进程一个小服务程序。我猜这也是错误所在。更不用说实际上不会作为 FB 的有效 OAuth2 流的事实。

标签： java json facebook servlets

【解决方案1】：

虽然这个问题很老了。我在这里为那些登陆这里寻求使用 Java 获取 Facebook 朋友的解决方案的用户写这篇文章。

如果您制作新的 FB 应用，Facebook 新 API 版本 2.0 不允许应用获取所有具有默认访问权限（即 public_profile）的 Facebook 好友。在版本 1 中，这是可能的。现在 Facebook 只允许获取已经在使用该应用程序的朋友，更准确地说是那些已经在您的网站上使用 Facebook 登录对话框登录的朋友。为此，您需要在打开 FB 登录对话框的链接中指定 user_friends 权限。（可能存在获取所有朋友的扩展权限。）

要了解如何仅获取那些使用 Java/Servlets 使用您的应用程序的 FB 朋友，这里有一篇解释它的文章：https://www.bitspedia.com/2012/01/how-to-get-facebook-friends-list-in.html

【讨论】：