我是GCM世界的新手。 我已按照链接[https://developer.android.com/google/gcm/ccs.html#smack][1]。
中的说明创建了XMPP GCM服务器我已经修改了一些代码，为方法 prepareClient创建一个端点作为connectXmpServer 。此方法建立与CCS的连接。我在移动设备上从我的客户端调用此端点。
这是我的服务器代码 -
public class SmackCcsClientEndpoint {
private static final Logger logger = Logger.getLogger("SmackCcsClientEndpoint");
private static final String GCM_SERVER = "gcm.googleapis.com";
private static final int GCM_PORT = 5236;
private static final String GCM_ELEMENT_NAME = "gcm";
private static final String GCM_NAMESPACE = "google:mobile:data";
private static SmackCcsClientEndpoint sInstance = null;
private String mApiKey = null;
private String mProjectId = null;
private boolean mDebuggable = false;
public static SmackCcsClientEndpoint getInstance() {
if (sInstance == null) {
throw new IllegalStateException("You have to prepare the client first");
}
return sInstance;
}
@ApiMethod(name = "connectXmpServer")
public void prepareClient(@Named("senderId") String projectId, @Named("apiKey") String apiKey,
@Named("debuggable") boolean debuggable)
throws XMPPException, IOException, SmackException {
synchronized(SmackCcsClientEndpoint.class) {
if (sInstance == null) {
sInstance = new SmackCcsClientEndpoint(projectId, apiKey, debuggable);
}
}
sInstance.connect();
}
private SmackCcsClientEndpoint(String projectId, String apiKey, boolean debuggable) {
this();
mApiKey = apiKey;
mProjectId = projectId;
mDebuggable = debuggable;
}
public SmackCcsClientEndpoint() {
ProviderManager.addExtensionProvider(GCM_ELEMENT_NAME, GCM_NAMESPACE,
new PacketExtensionProvider() {
@Override
public PacketExtension parseExtension(XmlPullParser parser) throws
Exception {
// TODO check nextText method
logger.severe("Before parse");
String json = parser.getText();
logger.severe("After parse");
return new GcmPacketExtension(json);
}
});
}
private XMPPConnection connection;
/**
* Indicates whether the connection is in draining state, which means that it
* will not accept any new downstream messages.
*/
protected volatile boolean connectionDraining = false;
/**
* Sends a downstream message to GCM.
*
* @return true if the message has been successfully sent.
*/
private boolean sendDownstreamMessage(String jsonRequest) throws
NotConnectedException {
if (!connectionDraining) {
send(jsonRequest);
return true;
}
logger.info("Dropping downstream message since the connection is draining");
return false;
}
/**
* Returns a random message id to uniquely identify a message.
*
* <p>Note: This is generated by a pseudo random number generator for
* illustration purpose, and is not guaranteed to be unique.
*/
private String nextMessageId() {
//TODO get unique ID
return "m-" + UUID.randomUUID().toString();
}
/**
* Sends a packet with contents provided.
*/
protected void send(String jsonRequest) throws NotConnectedException {
Packet request = new GcmPacketExtension(jsonRequest).toPacket();
connection.sendPacket(request);
}
/**
* Handles an upstream data message from a device application.
*
* <p>This sample echo server sends an echo message back to the device.
* Subclasses should override this method to properly process upstream messages.
*/
protected void handleUpstreamMessage(Map<String, Object> jsonObject) {
// PackageName of the application that sent this message.
String category = (String) jsonObject.get("category");
String from = (String) jsonObject.get("from");
@SuppressWarnings("unchecked")
Map<String, String> payload = (Map<String, String>) jsonObject.get("data");
payload.put("ECHO", "Application: " + category);
// Send an ECHO response back
String echo = createJsonMessage(from, nextMessageId(), payload,
"echo:CollapseKey", null, false);
try {
sendDownstreamMessage(echo);
} catch (NotConnectedException e) {
logger.log(Level.WARNING, "Not connected anymore, echo message is not sent", e);
}
}
/**
* Handles an ACK.
*
* <p>Logs a INFO message, but subclasses could override it to
* properly handle ACKs.
*/
protected void handleAckReceipt(Map<String, Object> jsonObject) {
String messageId = (String) jsonObject.get("message_id");
String from = (String) jsonObject.get("from");
logger.log(Level.INFO, "handleAckReceipt() from: " + from + ", messageId: " + messageId);
}
/**
* Handles a NACK.
*
* <p>Logs a INFO message, but subclasses could override it to
* properly handle NACKs.
*/
protected void handleNackReceipt(Map<String, Object> jsonObject) {
String messageId = (String) jsonObject.get("message_id");
String from = (String) jsonObject.get("from");
logger.log(Level.INFO, "handleNackReceipt() from: " + from + ", messageId: " + messageId);
}
protected void handleControlMessage(Map<String, Object> jsonObject) {
logger.log(Level.INFO, "handleControlMessage(): " + jsonObject);
String controlType = (String) jsonObject.get("control_type");
if ("CONNECTION_DRAINING".equals(controlType)) {
connectionDraining = true;
} else {
logger.log(Level.INFO, "Unrecognized control type: %s. ",
controlType);
}
}
/**
* Creates a JSON encoded GCM message.
*
* @param to RegistrationId of the target device (Required).
* @param messageId Unique messageId for which CCS will send an
* "ack/nack" (Required).
* @param payload Message content intended for the application. (Optional).
* @param collapseKey GCM collapse_key parameter (Optional).
* @param timeToLive GCM time_to_live parameter (Optional).
* @param delayWhileIdle GCM delay_while_idle parameter (Optional).
* @return JSON encoded GCM message.
*/
public static String createJsonMessage(String to, String messageId,
Map<String, String> payload, String collapseKey, Long timeToLive,
Boolean delayWhileIdle) {
Map<String, Object> message = new HashMap<String, Object>();
message.put("to", to);
if (collapseKey != null) {
message.put("collapse_key", collapseKey);
}
if (timeToLive != null) {
message.put("time_to_live", timeToLive);
}
if (delayWhileIdle != null && delayWhileIdle) {
message.put("delay_while_idle", true);
}
message.put("message_id", messageId);
message.put("data", payload);
return JSONValue.toJSONString(message);
}
/**
* Creates a JSON encoded ACK message for an upstream message received
* from an application.
*
* @param to RegistrationId of the device who sent the upstream message.
* @param messageId messageId of the upstream message to be acknowledged to CCS.
* @return JSON encoded ack.
*/
protected static String createJsonAck(String to, String messageId) {
Map<String, Object> message = new HashMap<String, Object>();
message.put("message_type", "ack");
message.put("to", to);
message.put("message_id", messageId);
return JSONValue.toJSONString(message);
}
/**
* Connects to GCM Cloud Connection Server using the supplied credentials.
*
*/
public void connect()throws XMPPException, IOException, SmackException {
ConnectionConfiguration config =
new ConnectionConfiguration(GCM_SERVER, GCM_PORT);
config.setSecurityMode(SecurityMode.enabled);
config.setReconnectionAllowed(true);
config.setRosterLoadedAtLogin(false);
config.setSendPresence(false);
config.setSocketFactory(SSLSocketFactory.getDefault());
connection = new XMPPTCPConnection(config);
connection.connect();
connection.addConnectionListener(new LoggingConnectionListener());
// Handle incoming packets
connection.addPacketListener(new PacketListener() {
@Override
public void processPacket(Packet packet) {
logger.log(Level.INFO, "Received: " + packet.toXML());
Message incomingMessage = (Message) packet;
GcmPacketExtension gcmPacket =
(GcmPacketExtension) incomingMessage.
getExtension(GCM_NAMESPACE);
String json = gcmPacket.getJson();
try {
@SuppressWarnings("unchecked")
Map<String, Object> jsonObject =
(Map<String, Object>) JSONValue.
parseWithException(json);
// present for "ack"/"nack", null otherwise
Object messageType = jsonObject.get("message_type");
if (messageType == null) {
// Normal upstream data message
handleUpstreamMessage(jsonObject);
// Send ACK to CCS
String messageId = (String) jsonObject.get("message_id");
String from = (String) jsonObject.get("from");
String ack = createJsonAck(from, messageId);
send(ack);
} else if ("ack".equals(messageType.toString())) {
// Process Ack
handleAckReceipt(jsonObject);
} else if ("nack".equals(messageType.toString())) {
// Process Nack
handleNackReceipt(jsonObject);
} else if ("control".equals(messageType.toString())) {
// Process control message
handleControlMessage(jsonObject);
} else {
logger.log(Level.WARNING,
"Unrecognized message type (%s)",
messageType.toString());
}
} catch (ParseException e) {
logger.log(Level.SEVERE, "Error parsing JSON " + json, e);
} catch (Exception e) {
logger.log(Level.SEVERE, "Failed to process packet", e);
}
}
}, new PacketTypeFilter(Message.class));
// Log all outgoing packets
connection.addPacketInterceptor(new PacketInterceptor() {
@Override
public void interceptPacket(Packet packet) {
logger.log(Level.INFO, "Sent: {0}", packet.toXML());
}
}, new PacketTypeFilter(Message.class));
connection.login(mProjectId + "@gcm.googleapis.com", mApiKey);
}
/**
* XMPP Packet Extension for GCM Cloud Connection Server.
*/
private static final class GcmPacketExtension extends DefaultPacketExtension {
private final String json;
public GcmPacketExtension(String json) {
super(GCM_ELEMENT_NAME, GCM_NAMESPACE);
this.json = json;
}
public String getJson() {
return json;
}
@Override
public String toXML() {
return String.format("<%s xmlns=\"%s\">%s</%s>",
GCM_ELEMENT_NAME, GCM_NAMESPACE,
StringUtils.escapeForXML(json), GCM_ELEMENT_NAME);
}
public Packet toPacket() {
Message message = new Message();
message.addExtension(this);
return message;
}
}
private static final class LoggingConnectionListener
implements ConnectionListener {
@Override
public void connected(XMPPConnection xmppConnection) {
logger.info("Connected.");
}
@Override
public void authenticated(XMPPConnection xmppConnection) {
logger.info("Authenticated.");
}
@Override
public void reconnectionSuccessful() {
logger.info("Reconnecting..");
}
@Override
public void reconnectionFailed(Exception e) {
logger.log(Level.INFO, "Reconnection failed.. ", e);
}
@Override
public void reconnectingIn(int seconds) {
logger.log(Level.INFO, "Reconnecting in %d secs", seconds);
}
@Override
public void connectionClosedOnError(Exception e) {
logger.info("Connection closed on error.");
}
@Override
public void connectionClosed() {
logger.info("Connection closed.");
}
}
}
在客户端，我在Asynctask中调用端点 -
protected String doInBackground(Object... params) {
if(messageService == null){
SmackAppServer.Builder builder = new SmackAppServer.Builder(AndroidHttp.newCompatibleTransport(), new AndroidJsonFactory(), null);
messageService = builder.build();
try {
messageService.connectXmpServer(gcmSenderId, password, true).execute();
} catch (IOException e) {
e.printStackTrace();
String logMsg;
logMsg = "Error while connecting : " + e.getMessage();
return logMsg;
}
}
context = (Context)params[0];
message = (String)params[1];
if (gcm == null) {
gcm = GoogleCloudMessaging.getInstance(context);
}
String logMsg;
/* if(!connected) {
try {
messageService.connect(senderId, password).execute();
connected = true;
logMsg = "Connection established!";
} catch (IOException e) {
e.printStackTrace();
logMsg = "Error while connecting! " + e.getMessage();
return logMsg;
}
}*/
String id = Integer.toString(msgId.incrementAndGet());
Bundle data = new Bundle();
// Bundle data consists of a key-value pair
data.putString("message", message);
// "time to live" parameter
// This is optional. It specifies a value in seconds up to 24 hours.
try {
gcm.send(gcmSenderId + "@gcm.googleapis.com", id, data);
logMsg = "Message sent!";
} catch (IOException e) {
e.printStackTrace();
logMsg = "Error while sending message! " + e.getMessage();
}
return logMsg;
}
然而，此调用会导致异常。我不知道这里出了什么问题。
com.google.api.server.spi.SystemService invokeServiceMethod: null
java.lang.ExceptionInInitializerError
at org.jivesoftware.smack.ConnectionConfiguration.<init>(ConnectionConfiguration.java:67)
at com.example.mymodule.XMPPServer.SmackCcsClientEndpoint.connect(SmackCcsClientEndpoint.java:255)
at com.example.mymodule.XMPPServer.SmackCcsClientEndpoint.prepareClient(SmackCcsClientEndpoint.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:45)
at com.google.api.server.spi.SystemService.invokeServiceMethod(SystemService.java:359)
at com.google.api.server.spi.SystemServiceServlet.execute(SystemServiceServlet.java:160)
at com.google.api.server.spi.SystemServiceServlet.doPost(SystemServiceServlet.java:118)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:438)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:445)
at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:220)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:309)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:301)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:442)
at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.IllegalStateException: org.xmlpull.v1.XmlPullParserException: could not load any factory class (even small or full default implementation); nested exception is:
org.kxml2.io.XmlReader
at org.jivesoftware.smack.SmackConfiguration.<clinit>(SmackConfiguration.java:158)
... 35 more
Caused by: org.xmlpull.v1.XmlPullParserException: could not load any factory class (even small or full default implementation); nested exception is:
org.kxml2.io.XmlReader
at org.xmlpull.v1.XmlPullParserFactory.newInstance(XmlPullParserFactory.java:225)
at org.xmlpull.v1.XmlPullParserFactory.newInstance(XmlPullParserFactory.java:76)
at org.jivesoftware.smack.SmackConfiguration.processConfigFile(SmackConfiguration.java:352)
at org.jivesoftware.smack.SmackConfiguration.processConfigFile(SmackConfiguration.java:347)
at org.jivesoftware.smack.SmackConfiguration.<clinit>(SmackConfiguration.java:155)
... 35 more
在服务器端，原始代码段位于静态块内。但是 parser.nextText 给出了编译错误。我下载了最新的XMLPullParser jar并用 parser.getText 替换了这个调用。这可能是可能的原因吗？
原始服务器代码 -
static {
ProviderManager.addExtensionProvider(GCM_ELEMENT_NAME, GCM_NAMESPACE,
new PacketExtensionProvider() {
@Override
public PacketExtension parseExtension(XmlPullParser parser) throws
Exception {
String json = parser.nextText();
return new GcmPacketExtension(json);
}
});
}
请帮帮我。我无法继续，因为我陷入了非常基本的水平。
此致 SHAILESH
答案 0 :(得分：3)
我从XPP3下载了jar并将其添加到我的后端模块的Android studio中的依赖项中。这不再与Smack API捆绑在一起了。
答案 1 :(得分：0)
下载www.extreme.indiana.edu/dist/java-repository/xpp3/jars/xpp3-1.1.4c.jar并保留确切的行：String json = parser.nextText（）;