java - 如何使用 xmpp 连接 Facebook 聊天，我想输入 friend 的用户名，然后聊天显示 SASL 身份验证失败

Question

我可以为 gtalk 连接 xmpp，但我不知道如何为 facebook 聊天连接 xmpp，我搜索了很多，然后我写了一些代码，它也不起作用，

现在我正在尝试这样，用户需要输入他的用户名和密码，然后用户必须输入他的 friend 的用户名和消息，然后聊天。

XMPPClient.java

public class XMPPClient extends Activity {

    private ArrayList<String> messages = new ArrayList();
    private Handler mHandler = new Handler();
    private SettingsDialog mDialog;
    private EditText mRecipient;
    private EditText mSendText;
    private ListView mList;
    private XMPPConnection connection;

    /**
     * Called with the activity is first created.
     */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        Log.i("XMPPClient", "onCreate called");
        setContentView(R.layout.main);
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

        mRecipient = (EditText) this.findViewById(R.id.recipient);
        Log.i("XMPPClient", "mRecipient = " + mRecipient);
        mSendText = (EditText) this.findViewById(R.id.sendText);
        Log.i("XMPPClient", "mSendText = " + mSendText);
        mList = (ListView) this.findViewById(R.id.listMessages);
        Log.i("XMPPClient", "mList = " + mList);
        setListAdapter();

        // Dialog for getting the xmpp settings
        mDialog = new SettingsDialog(this);

        // Set a listener to show the settings dialog
        Button setup = (Button) this.findViewById(R.id.setup);
        setup.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                mHandler.post(new Runnable() {
                    public void run()
                    {
                        mDialog.show();
                    }
                });
            }
        });

        // Set a listener to send a chat text message
        Button send = (Button) this.findViewById(R.id.send);
        send.setOnClickListener(new View.OnClickListener() 
        {
            public void onClick(View view) {
                String to = mRecipient.getText().toString();
                String text = mSendText.getText().toString();

                Log.i("XMPPClient", "Sending text [" + text + "] to [" + to + "]");
                Message msg = new Message(to, Message.Type.chat);
                msg.setBody(text);
                connection.sendPacket(msg);
                messages.add(connection.getUser() + ":");
                messages.add(text);
                setListAdapter();
            }
        });
    }

    /**
     * Called by Settings dialog when a connection is establised with the XMPP server
     *
     * @param connection
     */
    public void setConnection
            (XMPPConnection
                    connection) {
        this.connection = connection;
        if (connection != null) {
            // Add a packet listener to get messages sent to us
            PacketFilter filter = new MessageTypeFilter(Message.Type.chat);
            connection.addPacketListener(new PacketListener() {
                public void processPacket(Packet packet) {
                    Message message = (Message) packet;
                    if (message.getBody() != null) {
                        String fromName = StringUtils.parseBareAddress(message.getFrom());
                        Log.i("XMPPClient", "Got text [" + message.getBody() + "] from [" + fromName + "]");
                        messages.add(fromName + ":");
                        messages.add(message.getBody());
                        // Add the incoming message to the list view
                        mHandler.post(new Runnable() {
                            public void run() {
                                setListAdapter();
                            }
                        });
                    }
                }
            }, filter);
        }
    }

    private void setListAdapter
            () {
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                R.layout.multi_line_list_item,
                messages);
        mList.setAdapter(adapter);
    }
}

settings.java

     public class SettingsDialog extends Dialog implements android.view.View.OnClickListener {
    private XMPPClient xmppClient;


    public SettingsDialog(XMPPClient xmppClient) {
        super(xmppClient);
        this.xmppClient = xmppClient;
    }

    protected void onStart() {
        super.onStart();
        setContentView(R.layout.settings);
        getWindow().setFlags(4, 4);
        setTitle("XMPP Settings");
        Button ok = (Button) findViewById(R.id.ok);
        ok.setOnClickListener(this);
    }
    public void onClick(View v) {
        String host = getText(R.id.host);
        String port = getText(R.id.port);
        String service = getText(R.id.service);
        String username = getText(R.id.userid);
        String password = getText(R.id.password);

        //GTalk...Host name : talk.google.com       The port number is 5222 service name : gmail.com
        //Yahoo...Host name : iopibm.msg.yahoo.com  The default port is 5061 service name : yahoo.com
        //Facebook Hostname : chat.facebook.com     The port number is 5222  service = chat.facebook.com for authentication SASLAuthentication.supportSASLMechanism("PLAIN", 0);
        ConnectionConfiguration config = new ConnectionConfiguration("chat.facebook.com", 5222);
        config.setSASLAuthenticationEnabled(true);
        XMPPConnection xmpp = new XMPPConnection(config);
        try
        {
            SASLAuthentication.registerSASLMechanism("X-FACEBOOK-PLATFORM", SASLXFacebookPlatformMechanism.class);
            SASLAuthentication.supportSASLMechanism("X-FACEBOOK-PLATFORM", 0);
            xmpp.connect();
            xmpp.login("268651109963113", "268651109963113|zq84UUmSj7vh_I8oj7yfGLebKgY", "Application");
        } catch (XMPPException e)
        {
            xmpp.disconnect();
            e.printStackTrace();
        }
    }
    private String getText(int id) {
        EditText widget = (EditText) this.findViewById(id);
        return widget.getText().toString();
    }
}

SASLXFacebookPlatformMechanism.java

public class SASLXFacebookPlatformMechanism extends SASLMechanism {

private static final String NAME = "X-FACEBOOK-PLATFORM";

private String apiKey = "268651109963113";
private String access_token = "268651109963113|zq84UUmSj7vh_I8oj7yfGLebKgY";

/**
 * Constructor.
 */
public SASLXFacebookPlatformMechanism(SASLAuthentication saslAuthentication) {
    super(saslAuthentication);
}

@Override
protected void authenticate() throws IOException, XMPPException {

    getSASLAuthentication().send(new AuthMechanism(NAME, ""));
}

@Override
public void authenticate(String apiKey, String host, String acces_token)
        throws IOException, XMPPException {
    if (apiKey == null || acces_token == null) {
        throw new IllegalArgumentException("Invalid parameters");
    }

    this.access_token = acces_token;
    this.apiKey = apiKey;
    this.hostname = host;

    String[] mechanisms = { NAME };
    Map<String, String> props = new HashMap<String, String>();
    this.sc = Sasl.createSaslClient(mechanisms, null, "xmpp", host, props,
            this);
    authenticate();
}

@Override
public void authenticate(String username, String host, CallbackHandler cbh)
        throws IOException, XMPPException {
    String[] mechanisms = { NAME };
    Map<String, String> props = new HashMap<String, String>();
    this.sc = Sasl.createSaslClient(mechanisms, null, "xmpp", host, props,
            cbh);
    authenticate();
}

@Override
protected String getName() {
    return NAME;
}

@Override
public void challengeReceived(String challenge) throws IOException {
    byte[] response = null;

    if (challenge != null) {
        String decodedChallenge = new String(Base64.decode(challenge));
        Map<String, String> parameters = getQueryMap(decodedChallenge);

        String version = "1.0";
        String nonce = parameters.get("nonce");
        String method = parameters.get("method");

        long callId = new GregorianCalendar().getTimeInMillis();

        String composedResponse = "api_key="
                + URLEncoder.encode(apiKey, "utf-8") + "&call_id=" + callId
                + "&method=" + URLEncoder.encode(method, "utf-8")
                + "&nonce=" + URLEncoder.encode(nonce, "utf-8")
                + "&access_token="
                + URLEncoder.encode(access_token, "utf-8") + "&v="
                + URLEncoder.encode(version, "utf-8");

        response = composedResponse.getBytes("utf-8");
    }

    String authenticationText = "";

    if (response != null) {
        authenticationText = Base64.encodeBytes(response,
                Base64.DONT_BREAK_LINES);
    }

    // Send the authentication to the server
    getSASLAuthentication().send(new Response(authenticationText));
}

private Map<String, String> getQueryMap(String query) {
    Map<String, String> map = new HashMap<String, String>();
    String[] params = query.split("\\&");

    for (String param : params) {
        String[] fields = param.split("=", 2);
        map.put(fields[0], (fields.length > 1 ? fields[1] : null));
    }

    return map;
}
}

现在我更新的代码在这些行中抛出 NPE

Message msg = new Message(to, Message.Type.chat);
                msg.setBody(text);
                connection.sendPacket(msg);

首先它会打开对话框，我们需要输入用户 ID 和密码，然后输入好友列表的用户名，然后是 msg，然后点击发送，我正在尝试，，，我正在输入用户名称也正确，但在单击发送按钮时显示 NUll ponter 异常

Answer 1

我认为问题可能是您在某个地方有 2 个包含相同包和类的 jar 文件。所以我强烈建议您再次检查所有 jar 文件并删除导致问题的所有文件。

从其中一个 JAR 文件中删除此包将解决问题。