<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>3.4.4</version>
          <relativePath/> <!-- lookup parent from repository -->
     </parent>
     <groupId>org.example</groupId>
     <artifactId>MySpringWebSocket</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <name>MySpringWebSocket</name>
     <description>MySpringWebSocket</description>
     <url/>
     <licenses>
          <license/>
     </licenses>
     <developers>
          <developer/>
     </developers>
     <scm>
          <connection/>
          <developerConnection/>
          <tag/>
          <url/>
     </scm>
     <properties>
          <java.version>17</java.version>
     </properties>
     <dependencies>
          <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter</artifactId>
          </dependency>

          <!-- web starter -->
          <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-web</artifactId>
          </dependency>

          <!-- web socket -->
          <dependency>
               <groupId>org.springframework</groupId>
               <artifactId>spring-websocket</artifactId>
          </dependency>

          <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-test</artifactId>
               <scope>test</scope>
          </dependency>
     </dependencies>

     <build>
          <plugins>
               <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
               </plugin>
          </plugins>
     </build>

</project>

package org.example.myspringwebsocket;

import java.io.IOException;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;

@Component
public class MyWebSocketHandler extends TextWebSocketHandler {

     @Override
     public void handleTextMessage(WebSocketSession session, TextMessage message)
               throws InterruptedException, IOException {

          String payload = message.getPayload();
          session.sendMessage(new TextMessage("Today weather is good"));
     }
}

package org.example.myspringwebsocket;

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;

@Configuration
@EnableWebSocket
public class MyWebSocketConfig implements WebSocketConfigurer {

     public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
          registry.addHandler(new MyWebSocketHandler(), "/mysocket1").setAllowedOrigins("*");
     }

}

<script>
     webSocket = new WebSocket('ws://localhost:8080/mysocket1'); // connect to server

     webSocket.onopen = function(event) {
          alert("Connection open");

          webSocket.send("My name is Evgen"); // send message to server
     };

     webSocket.onmessage = function(event) {
          alert("message from server: " + event.data); // message from server
     };
</script>