I would like to set the port number of my serverEnPoint.
Here is my server socket:
import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
#ServerEndpoint("/myEndPoint")
public class MyEndPoint {
private static Session session;
#OnOpen
public void onOpen(Session s) throws IOException {
session = s;
}
#OnMessage
public String echo(String message) {
return message + " (from your server)";
}
#OnError
public void onError(Throwable t) {
t.printStackTrace();
}
public static void sendMessage(String message){
try {
session.getBasicRemote().sendText(message);
} catch (IOException e) {
e.printStackTrace();
}
}
I ask how to do that because my server needs to open a websocket but still allow REST API.
I am assuming that the websocket port by default is the same as REST and this is why my client does not connect. If you have other solution let me know.
Thanks
Related
I am trying to connect to websocket server endpoint using below code but I am not able to resolve container.connectToServer(this, cec, uri); this. This method is not able to take my class as Endpoint class. It's a spring boot project. If I don't pass config then it accepts but then it fails to connect to server and return 401. I have tried many online links but failed to resolve this issue. Need help in how to fix it.
#ClientEndpoint
public class TestClassEndpoint {
private Session userSession = null;
public TestClassEndpoint(URI uri) {
try {
WebSocketContainer container = ContainerProvider.getWebSocketContainer();
ClientEndpointConfig cec = ClientEndpointConfig.Builder
.create().configurator(new ClientEndpointConfig.Configurator() {
public void beforeRequest(Map<String, List<String>> headers) {
System.out.println("Setting user cookie in beforeRequest ...");
headers.put("Authorization", Arrays.asList("Basic base64encodedString"));
}
}).build();
container.connectToServer(this, cec, uri);
} catch (Exception e) {
e.printStackTrace();
}
}
#OnOpen
public void onOpen(Session session) {
this.userSession = session;
System.out.println("New connection established");
}
#OnMessage
public void onMessage(String message, Session session) {
System.out.println(message);
}
#OnClose
public void onClose(Session userSession, CloseReason reason) {
this.userSession = null;
System.out.println("connection closed");
}
#OnError
public void onError(Throwable t) {
}
private void sendMessage(ByteBuffer buffer) {
this.userSession.getAsyncRemote().sendBinary(buffer);
}
}
Main class
#SpringBootApplication
public class MainApplication implements CommandLineRunner {
public static void main(String[] args) {
SpringApplication.run(TwilioPocApplication.class, args);
}
#Override
public void run(String... args) throws Exception {
URI uri = UriComponentsBuilder.fromUriString("server_url").build().toUri();
new TestClassEndpoint(uri);
}
}
I am using spring-boot-websocket (spring-boot version 1.5.10) in my project. I have configured it as below,
#Configuration
#EnableWebSocketMessageBroker
public class WebSocketConfig extends WebSocketMessageBrokerConfigurationSupport
implements WebSocketMessageBrokerConfigurer {
#Value( "${rabbitmq.host}" )
private String rabbitmqHost;
#Value( "${rabbitmq.stomp.port}" )
private int rabbitmqStompPort;
#Value( "${rabbitmq.username}" )
private String rabbitmqUserName;
#Value( "${rabbitmq.password}" )
private String rabbitmqPassword;
#Override
public void configureMessageBroker( MessageBrokerRegistry registry )
{
registry.enableStompBrokerRelay("/topic", "/queue").setRelayHost(rabbitmqHost).setRelayPort(rabbitmqStompPort)
.setSystemLogin(rabbitmqUserName).setSystemPasscode(rabbitmqPassword);
registry.setApplicationDestinationPrefixes("/app");
}
#Override
public void registerStompEndpoints( StompEndpointRegistry stompEndpointRegistry )
{
stompEndpointRegistry.addEndpoint("/ws").setAllowedOrigins("*").withSockJS();
}
#Bean
#Override
public WebSocketHandler subProtocolWebSocketHandler()
{
return new CustomSubProtocolWebSocketHandler(clientInboundChannel(), clientOutboundChannel());
}
#Override
public void configureWebSocketTransport( WebSocketTransportRegistration registry )
{
super.configureWebSocketTransport(registry);
}
#Override
public boolean configureMessageConverters( List<MessageConverter> messageConverters )
{
return super.configureMessageConverters(messageConverters);
}
#Override
public void configureClientInboundChannel( ChannelRegistration registration )
{
super.configureClientInboundChannel(registration);
}
#Override
public void configureClientOutboundChannel( ChannelRegistration registration )
{
super.configureClientOutboundChannel(registration);
}
#Override
public void addArgumentResolvers( List<HandlerMethodArgumentResolver> argumentResolvers )
{
super.addArgumentResolvers(argumentResolvers);
}
#Override
public void addReturnValueHandlers( List<HandlerMethodReturnValueHandler> returnValueHandlers )
{
super.addReturnValueHandlers(returnValueHandlers);
}
}
public class CustomSubProtocolWebSocketHandler extends SubProtocolWebSocketHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(CustomSubProtocolWebSocketHandler.class);
#Autowired
private UserCommons userCommons;
CustomSubProtocolWebSocketHandler(MessageChannel clientInboundChannel,
SubscribableChannel clientOutboundChannel) {
super(clientInboundChannel, clientOutboundChannel);
}
#Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
LOGGER.info("************************************************************************************************************************New webSocket connection was established: {}", session);
String token = session.getUri().getQuery().replace("token=", "");
try
{
String user = Jwts.parser().setSigningKey(TokenConstant.SECRET)
.parseClaimsJws(token.replace(TokenConstant.TOKEN_PREFIX, "")).getBody().getSubject();
Optional<UserModel> userModelOptional = userCommons.getUserByEmail(user);
if( !userModelOptional.isPresent() )
{
LOGGER.error(
"************************************************************************************************************************Invalid token is passed with web socket request");
throw new DataException(GeneralConstants.EXCEPTION, "Invalid user", HttpStatus.BAD_REQUEST);
}
}
catch( Exception e )
{
LOGGER.error(GeneralConstants.ERROR, e);
}
super.afterConnectionEstablished(session);
}
#Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
LOGGER.error("************************************************************************************************************************webSocket connection was closed");
LOGGER.error("Reason for closure {} Session: {} ", closeStatus.getReason(),session.getId() );
super.afterConnectionClosed(session, closeStatus);
}
#Override
public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
LOGGER.error("************************************************************************************************************************Connection closed unexpectedly");
LOGGER.error(GeneralConstants.ERROR, exception);
super.handleTransportError(session, exception);
}
}
From the client-side, I am creating a SockJS object to establish the connection,
let url = `/ws?token=${localStorage.getItem("access_token")}`;
// Web Socket connection
/* eslint-disable */
let sockJS = new SockJS(url);
let stompClient = Stomp.over(sockJS);
debugger
this.setState({
stompObject : stompClient,
});
But the connection is not getting established consistently, most of the times it is stuck at Opening the connection, in the backend log, I can see the connection getting established and a session is created. But, in the browser console, I can see client-side sending message to the server but the server is not acknowledging the message.
Sometimes, when I refresh the browser for 10-15 times, the connection is getting established successfully. Is there any mistake in my configuration?
Thank You.
Given that you can "hit refresh 10 or 15 times and then get a connection," I'm curious if you dealing with a cookie issue? I know Chrome is famous for that sort of thing. Anyway close out all browser windows and stop the browser, then start the browser, and tell it to clear browsing history and then attempt the connection. Also, be SURE you read the version of the spring-boot docs for the version of spring-boot you are that you are actually using, and also specify the SB version in your questions and when looking for answers.
There appears to be very little Java 11 (pure Java non framework based) WebSocket client code examples on the web so I'm hoping StackOverflow can come to the rescue for me once again.
This is the closest I've found, but unfortunately to my (novice) eyes, it doesn't appear to be a complete solution in showing how to consume the data from the WebSocket listener.
Looking at the WebSocket.Listener implementation, the onText callback method I presume would provide what I need, but I'm struggling to figure out how to return the CompletionStage object and some sort of string data from the socket.
This is some test code I have so far.
Would appreciate assistance. Thanks
public class Main {
public static void main(String[] args) {
WebSocketClient wsc = new WebSocketClient();
wsc.startSocket("ws://demos.kaazing.com/echo");
int i = 0;
// Bad, very bad
do {} while (i == 0);
}
}
public class WebSocketClient implements WebSocket.Listener {
#Override
public void onOpen(WebSocket webSocket) {
//...
System.out.println("Go...Open".concat(
webSocket.getSubprotocol()));
}
#Override
public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
//...
System.out.println(data.toString());
// How do I return the CompletionStage object
// return CompletionStage<String>
}
#Override
public void onError(WebSocket webSocket, Throwable error) {
//..
System.out.println("Bad day! ".concat(webSocket.toString()));
}
void startSocket(String connection) {
CompletableFuture<WebSocket> server_cf = HttpClient.
newHttpClient().
newWebSocketBuilder().
buildAsync(URI.create(connection),
new WebSocketClient());
WebSocket server = server_cf.join();
server.sendText("Hello!", true);
}
}
Below you find a working example. I have made some changes to your code above:
onOpen needs to invoke request(1) on the websocket (invoking the default implementation) in order to receive further invocations.
moved method startSocket into the main method
replaced busy waiting with a count down latch
declared class WebSocketClient as a (static) inner class
but beyond these (cosmetic) changes the program follows your idea, i.e. first a websocket connection is build and after successful construction the text Hello! is sent to the echo server. This could also be done in method onOpen directly.
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.WebSocket;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.CountDownLatch;
public class Main {
public static void main(String[] args) throws Exception {
CountDownLatch latch = new CountDownLatch(1);
WebSocket ws = HttpClient
.newHttpClient()
.newWebSocketBuilder()
.buildAsync(URI.create("ws://demos.kaazing.com/echo"), new WebSocketClient(latch))
.join();
ws.sendText("Hello!", true);
latch.await();
}
private static class WebSocketClient implements WebSocket.Listener {
private final CountDownLatch latch;
public WebSocketClient(CountDownLatch latch) { this.latch = latch; }
#Override
public void onOpen(WebSocket webSocket) {
System.out.println("onOpen using subprotocol " + webSocket.getSubprotocol());
WebSocket.Listener.super.onOpen(webSocket);
}
#Override
public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
System.out.println("onText received " + data);
latch.countDown();
return WebSocket.Listener.super.onText(webSocket, data, last);
}
#Override
public void onError(WebSocket webSocket, Throwable error) {
System.out.println("Bad day! " + webSocket.toString());
WebSocket.Listener.super.onError(webSocket, error);
}
}
}
Btw, no supprotocol was negotiated, therefore method webSocket.getSubprotocol() returns an empty string. The output in the console is
onOpen using subprotocol
onText received Hello!
The pattern for managing a WebSocket response returning a CompletionStage is:
#Override
public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
// return inmmediately but response is geenrated lazyly.
return CompletableFuture.supplyAsync(() -> {
String response = "Received ...";
// do slow task. Access to database or access to a server.
return response;
});
}
This simple implementation only is recommended when the response is generated quickly.
#Override
public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
// fast response.
String response = "The text has " + data.length() + " chars";
return CompletableFuture.completedFuture(response);
}
I have had some trouble getting various examples working. Specifically, I had trouble finding examples that actually showed how to open, send, and receive simple text messages. One important piece was having a server to which to connect. Here is what I managed to make work.
package webSockets;
import java.io.IOException;
import java.net.URI;
import javax.websocket.CloseReason;
import javax.websocket.ContainerProvider;
import javax.websocket.Endpoint;
import javax.websocket.EndpointConfig;
import javax.websocket.MessageHandler;
import javax.websocket.Session;
import javax.websocket.WebSocketContainer;
public class SimpleWebsocketClient extends Endpoint {
private Session session;
public SimpleWebsocketClient() {}
public SimpleWebsocketClient(URI endpointURI) {
try {
WebSocketContainer container = ContainerProvider.getWebSocketContainer();
container.connectToServer(this, endpointURI);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
#Override
public void onClose(Session session, CloseReason reason){
System.out.println("Disconnected as a result of "+ reason.getReasonPhrase());
}
#Override
public void onError(Session session, Throwable error){
System.out.println("Error communicating with server: " + error.getMessage());
}
#Override
public void onOpen(Session s, EndpointConfig config) {
System.out.println("Session opened");
session = s;
session.addMessageHandler(new MessageHandler.Whole<String>() {
#Override
public void onMessage(String msg) {
System.out.println("Text Message Received:" + msg);
}
});
try {
session.getBasicRemote().sendText("Hello there.");
session.getBasicRemote().sendText("Hope you are well!");
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
public static void main(String...arg) {
URI uri = URI.create("ws://connect.websocket.in/v3/1?api_key=oCdCMcMPQpbvNjUIzqtvF1d2X2okWpDQj4AwARJuAgtjhzKxVEjQU6IdCjwm¬ify_self");
new SimpleWebsocketClient(uri);
while(true) {}
}
}
I am trying to do an Jetty Web Socket example .
I copied a example from internet , which was working fine when i deployed directly into server without making any chnages .
But when i copied the Source (the servlet) into Eclipse IDE , it was giving Compilation
Exceptions related to
The method onClose(int, String) of type Html5Servlet.StockTickerSocket must override a superclass method
- The method onOpen(WebSocket.Connection) of type Html5Servlet.StockTickerSocket must override a superclass method
The method onMessage(String) of type Html5Servlet.StockTickerSocket must override a superclass method
This is my servlet , i kept the jars as it is mentioned in that example
package org.ajeesh.app;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.atomic.AtomicInteger;
import javax.servlet.http.HttpServletRequest;
import org.eclipse.jetty.websocket.WebSocket;
import org.eclipse.jetty.websocket.WebSocketServlet;
public class Html5Servlet extends WebSocketServlet {
private AtomicInteger index = new AtomicInteger();
private static final List<String> tickers = new ArrayList<String>();
static{
tickers.add("ajeesh");
tickers.add("peeyu");
tickers.add("kidillan");
tickers.add("entammo");
}
/**
*
*/
private static final long serialVersionUID = 1L;
public WebSocket doWebSocketConnect(HttpServletRequest req, String resp) {
System.out.println("On server");
return new StockTickerSocket();
}
protected String getMyJsonTicker(){
StringBuilder start=new StringBuilder("{");
start.append("\"stocks\":[");
int counter=0;
for (String aTicker : tickers) {
counter++;
start.append("{ \"ticker\":\""+aTicker +"\""+","+"\"price\":\""+index.incrementAndGet()+"\" }");
if(counter<tickers.size()){
start.append(",");
}
}
start.append("]");
start.append("}");
return start.toString();
}
public class StockTickerSocket implements WebSocket.OnTextMessage{
private Connection connection;
private Timer timer;
#Override
public void onClose(int arg0, String arg1) {
System.out.println("Web socket closed!");
}
#Override
public void onOpen(Connection connection) {
System.out.println("onOpen!");
this.connection=connection;
this.timer=new Timer();
}
#Override
public void onMessage(String data) {
System.out.println("onMessage!");
if(data.indexOf("disconnect")>=0){
connection.close();
timer.cancel();
}else{
sendMessage();
}
}
private void sendMessage() {
System.out.println("sendMessage!");
if(connection==null||!connection.isOpen()){
System.out.println("Connection is closed!!");
return;
}
timer.schedule(new TimerTask() {
#Override
public void run() {
try{
System.out.println("Running task");
connection.sendMessage(getMyJsonTicker());
}
catch (IOException e) {
e.printStackTrace();
}
}
}, new Date(),5000);
}
}
}
I have a Sample WebSocket Program whown below which works fine
When ever the user closes the browser or if there is any excetion Or any disconnect , the onClose Method is
being called
My question is that , Is it possible to know from the program what is the reason for onClose being called ??
Please share your views , Thanks for reading .
public class Html5Servlet extends WebSocketServlet {
private AtomicInteger index = new AtomicInteger();
private static final List<String> tickers = new ArrayList<String>();
static{
tickers.add("ajeesh");
tickers.add("peeyu");
tickers.add("kidillan");
tickers.add("entammo");
}
/**
*
*/
private static final long serialVersionUID = 1L;
public WebSocket doWebSocketConnect(HttpServletRequest req, String resp) {
//System.out.println("doWebSocketConnect");
return new StockTickerSocket();
}
protected String getMyJsonTicker() throws Exception{
return "";
}
public class StockTickerSocket implements WebSocket.OnTextMessage{
private Connection connection;
private Timer timer;
#Override
public void onClose(int arg0, String arg1) {
System.out.println("onClose called!"+arg0);
}
#Override
public void onOpen(Connection connection) {
//System.out.println("onOpen");
this.connection=connection;
this.timer=new Timer();
}
#Override
public void onMessage(String data) {
//System.out.println("onMessage");
if(data.indexOf("disconnect")>=0){
connection.close();
timer.cancel();
}else{
sendMessage();
}
}
public void disconnect() {
System.out.println("disconnect called");
}
public void onDisconnect()
{
System.out.println("onDisconnect called");
}
private void sendMessage() {
if(connection==null||!connection.isOpen()){
//System.out.println("Connection is closed!!");
return;
}
timer.schedule(new TimerTask() {
#Override
public void run() {
try{
//System.out.println("Running task");
connection.sendMessage(getMyJsonTicker());
}
catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}, new Date(),5000);
}
}
}
The signature for onClose is the following ...
#Override
public void onClose(int closeCode, String closeReason) {
System.out.println("onClose called - statusCode = " + closeCode);
System.out.println(" reason = " + closeReason);
}
Where int closeCode is any of the registered Close Status Codes.
And String closeReason is an optional (per protocol spec) close reason message.