Spring Boot - Soket Web
Dalam bab ini, mari kita pahami cara membuat aplikasi web interaktif menggunakan Spring Boot dengan soket Web.
Untuk membangun aplikasi web interaktif di Spring Boot dengan soket Web, Anda perlu menambahkan dependensi berikut.
Pengguna Maven harus menambahkan dependensi berikut di file pom.xml.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>webjars-locator</artifactId>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>sockjs-client</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>stomp-websocket</artifactId>
<version>2.3.3</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.7</version> </dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.1.0</version>
</dependency>Pengguna Gradle dapat menambahkan dependensi berikut dalam file build.gradle Anda -
compile("org.springframework.boot:spring-boot-starter-websocket")
compile("org.webjars:webjars-locator")
compile("org.webjars:sockjs-client:1.0.2")
compile("org.webjars:stomp-websocket:2.3.3")
compile("org.webjars:bootstrap:3.3.7")
compile("org.webjars:jquery:3.1.0")Mari kita buat pengontrol penanganan pesan untuk bekerja dengan pesan STOMP. Pesan STOMP dapat dirutekan ke file kelas @Controller. Misalnya, GreetingController dipetakan untuk menangani pesan ke tujuan “/ hello”.
package com.tutorialspoint.websocketapp;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Controller;
@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, " + message.getName() + "!");
}
}Sekarang, konfigurasikan Spring untuk perpesanan STOMP. Tulis file kelas WebSocketConfig yang memperluas kelas AbstractWebSocketMessageBrokerConfigurer seperti yang ditunjukkan di bawah ini.
package com.tutorialspoint.websocketapp;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
@Override
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker("/topic");
config.setApplicationDestinationPrefixes("/app");
}
@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/tutorialspoint-websocket").withSockJS();
}
}Anotasi @EnableWebSocketMessageBroker digunakan untuk mengkonfigurasi broker pesan soket Web untuk membuat titik akhir STOMP.
Anda dapat membuat file klien browser di bawah src / main / resources / static / index.html seperti yang ditunjukkan -
<!DOCTYPE html>
<html>
<head>
<title>Hello WebSocket</title>
<link href = "/webjars/bootstrap/css/bootstrap.min.css" rel = "stylesheet">
<link href = "/main.css" rel = "stylesheet">
<script src = "/webjars/jquery/jquery.min.js"></script>
<script src = "/webjars/sockjs-client/sockjs.min.js"></script>
<script src = "/webjars/stomp-websocket/stomp.min.js"></script>
<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>Mari kita buat file app.js untuk menggunakan dan menghasilkan pesan dengan menggunakan STOMP.
var stompClient = null;
function setConnected(connected) {
$("#connect").prop("disabled", connected);
$("#disconnect").prop("disabled", !connected);
if (connected) {
$("#conversation").show();
} else {
$("#conversation").hide();
}
$("#greetings").html("");
}
function connect() {
var socket = new SockJS('/tutorialspoint-websocket');
stompClient = Stomp.over(socket);
stompClient.connect({}, function (frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe('/topic/greetings', function (greeting) {
showGreeting(JSON.parse(greeting.body).content);
});
});
}
function disconnect() {
if (stompClient !== null) {
stompClient.disconnect();
}
setConnected(false);
console.log("Disconnected");
}
function sendName() {
stompClient.send("/app/hello", {}, JSON.stringify({'name': $("#name").val()}));
}
function showGreeting(message) {
$("#greetings").append("<tr><td>" + message + "</td></tr>");
}
$(function () {
$( "form" ).on('submit', function (e) {e.preventDefault();});
$( "#connect" ).click(function() { connect(); });
$( "#disconnect" ).click(function() { disconnect(); });
$( "#send" ).click(function() { sendName(); });
});Kode untuk aplikasi Spring Boot utama ditunjukkan di bawah ini.
package com.tutorialspoint.websocketapp;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class WebsocketappApplication {
public static void main(String[] args) {
SpringApplication.run(WebsocketappApplication.class, args);
}
}File konfigurasi build lengkap diberikan di bawah ini.
Maven – pom.xml
<?xml version = "1.0" encoding = "UTF-8"?>
<project xmlns = "http://maven.apache.org/POM/4.0.0"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.tutorialspoint</groupId>
<artifactId>websocketapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>websocketapp</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>webjars-locator</artifactId>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>sockjs-client</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>stomp-websocket</artifactId>
<version>2.3.3</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.7</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>Gradle – build.gradle
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:1.5.9.RELEASE")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
jar {
baseName = 'websocketapp'
version = '0.1.0'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile("org.springframework.boot:spring-boot-starter-websocket")
compile("org.webjars:webjars-locator")
compile("org.webjars:sockjs-client:1.0.2")
compile("org.webjars:stomp-websocket:2.3.3")
compile("org.webjars:bootstrap:3.3.7")
compile("org.webjars:jquery:3.1.0")
testCompile("org.springframework.boot:spring-boot-starter-test")
}