Example of Spring4 Websocket

Application.java

package com.gleason.itext;
import java.util.Arrays;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.PathVariable;

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(applicationClass, args);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(applicationClass);
    }

    private static Class<Application> applicationClass = Application.class;
}

build.gradle

buildscript {
  repositories {
    mavenLocal()
    mavenCentral()
    maven { url "http://repo.spring.io/snapshot" }
    maven { url "http://repo.spring.io/milestone" }
  }
  dependencies {
    classpath("org.springframework.boot:spring-boot-gradle-plugin:1.1.4.BUILD-SNAPSHOT")
  }
}
apply plugin: 'war'
apply plugin: 'spring-boot'
apply plugin: 'groovy'
war { baseName='itext' }
repositories {
  mavenLocal()
  mavenCentral()
  maven { url "http://repo.spring.io/snapshot" }
  maven { url "http://repo.spring.io/milestone" }
  maven { url "http://repo.spring.io/libs-release" }
}
dependencies {
  compile("org.springframework.boot:spring-boot-starter-web")
  compile("org.springframework.boot:spring-boot-starter-websocket")
  compile("org.springframework:spring-messaging")
  providedRuntime("org.springframework.boot:spring-boot-starter-tomcat")
  testCompile("org.springframework.boot:spring-boot-starter-test")
  compile 'org.codehaus.groovy:groovy-all:2.2.0'
  compile 'com.lowagie:itext:4.2.1'
  compile 'com.google.code.gson:gson:2.2.4'
}

HelloMessage.java

package com.gleason.itext.model;

/**
 * Created with IntelliJ IDEA.
 * User: jgleason
 * Date: 6/30/14
 * Time: 1:30 PM
 * To change this template use File | Settings | File Templates.
 */
public class HelloMessage {

    private String name;

    public String getName() {
        return name;
    }


}

MyHandler.java

package com.gleason.itext.websocket;
import com.gleason.itext.model.HelloMessage;
import com.google.gson.Gson;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.handler.TextWebSocketHandler;

/**
 * Created with IntelliJ IDEA.
 * User: jgleason
 * Date: 6/30/14
 * Time: 1:18 PM
 * To change this template use File | Settings | File Templates.
 */
public class MyHandler extends TextWebSocketHandler {

    @Override
    public void handleTextMessage(WebSocketSession session, TextMessage message) {
        System.out.println("Testing "+message.getPayload());
        Gson gson = new Gson();
        HelloMessage helloMessage = gson.fromJson(message.getPayload(), HelloMessage.class);
        System.out.println(helloMessage.getName());
    }

}

WebSocketConfig.java

package com.gleason.itext;

import com.gleason.itext.websocket.MyHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
import org.springframework.web.socket.WebSocketHandler;

@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {

    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(myHandler(), "/myHandler");
    }

    @Bean
    public WebSocketHandler myHandler() {
        return new MyHandler();
    }

}

Nice and simple, thank you 👍