Getting Started | Using WebSocket to build an interactive web application (spring.io)
Getting Started | Using WebSocket to build an interactive web application
In Spring’s approach to working with STOMP messaging, STOMP messages can be routed to @Controller classes. For example, the GreetingController (from src/main/java/com/example/messagingstompwebsocket/GreetingController.java) is mapped to handle messages t
spring.io
package com.example.websocket;
public class Greeting {
private String content;
public Greeting() {
}
public Greeting(String content) {
this.content = content;
}
public String getContent() {
return content;
}
}
package com.example.websocket;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Controller;
import org.springframework.web.util.HtmlUtils;
@Controller
public class GreetingController {
@MessageMapping("/hello")
@SendTo("/topic/greetings")
public Greeting greeting(HelloMessage message) throws Exception {
Thread.sleep(1000); // simulated delay
return new Greeting("Hello, " + HtmlUtils.htmlEscape(message.getName()) + "!");
}
}
package com.example.websocket;
public class HelloMessage {
private String name;
public HelloMessage() {
}
public HelloMessage(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
package com.example.websocket;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
@Override
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker("/topic");
config.setApplicationDestinationPrefixes("/app");
}
@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/gs-guide-websocket");
}
}
package com.example.websocket;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class WebsocketApplication {
public static void main(String[] args) {
SpringApplication.run(WebsocketApplication.class, args);
}
}
app.js
const stompClient = new StompJs.Client({
brokerURL: 'ws://localhost:8080/gs-guide-websocket'
});
stompClient.onConnect = (frame) => {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe('/topic/greetings', (greeting) => {
showGreeting(JSON.parse(greeting.body).content);
});
};
stompClient.onWebSocketError = (error) => {
console.error('Error with websocket', error);
};
stompClient.onStompError = (frame) => {
console.error('Broker reported error: ' + frame.headers['message']);
console.error('Additional details: ' + frame.body);
};
function setConnected(connected) {
$("#connect").prop("disabled", connected);
$("#disconnect").prop("disabled", !connected);
if (connected) {
$("#conversation").show();
}
else {
$("#conversation").hide();
}
$("#greetings").html("");
}
function connect() {
stompClient.activate();
}
function disconnect() {
stompClient.deactivate();
setConnected(false);
console.log("Disconnected");
}
function sendName() {
stompClient.publish({
destination: "/app/hello",
body: JSON.stringify({'name': $("#name").val()})
});
}
function showGreeting(message) {
$("#greetings").append("<tr><td>" + message + "</td></tr>");
}
$(function () {
$("form").on('submit', (e) => e.preventDefault());
$( "#connect" ).click(() => connect());
$( "#disconnect" ).click(() => disconnect());
$( "#send" ).click(() => sendName());
});
index.html
<!DOCTYPE html>
<html>
<head>
<title>Hello WebSocket</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<link href="/main.css" rel="stylesheet">
<script src="/app.js"></script>
</head>
<body>
<noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websocket relies on Javascript being
enabled. Please enable
Javascript and reload this page!</h2></noscript>
<div id="main-content" class="container">
<div class="row">
<div class="col-md-6">
<form class="form-inline">
<div class="form-group">
<label for="connect">WebSocket connection:</label>
<button id="connect" class="btn btn-default" type="submit">Connect</button>
<button id="disconnect" class="btn btn-default" type="submit" disabled="disabled">Disconnect
</button>
</div>
</form>
</div>
<div class="col-md-6">
<form class="form-inline">
<div class="form-group">
<label for="name">What is your name?</label>
<input type="text" id="name" class="form-control" placeholder="Your name here...">
</div>
<button id="send" class="btn btn-default" type="submit">Send</button>
</form>
</div>
</div>
<div class="row">
<div class="col-md-12">
<table id="conversation" class="table table-striped">
<thead>
<tr>
<th>Greetings</th>
</tr>
</thead>
<tbody id="greetings">
</tbody>
</table>
</div>
</div>
</div>
</body>
</html>
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