SpringBoot Websocket 集群方案

集群方案如下：

1. 采用Redis的订阅与发布，由于Websocket无法被序列化，不能进行缓存，所以不能直接将websocket消息缓存到Redis中。
2. 采用单纯的RabbitMQ，利用fanout\topic进行消息订阅，将Websocket消息结果发送到消息队列中，在进行转发接收。参考代码
3. 采用RabbitMQ+MQTT消息协议，可以在RabbitMQ官网上看到
4. 采用RabbitMQ+STOMP消息协议，可以在RabbitMQ官网上看到【推荐使用】
5. 还能够利用负载均衡的源地址哈希法，将ip通过一定的hash算法转发到一台固定的服务器（这个的话，对代码几乎没有改动，不过缺点也比较大）

---

接下来介绍如何使用RabbitMQ+STOMP，代码如下

maven

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>


        <!--websocket 相关依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>webjars-locator-core</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>

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


        <dependency>
        <groupId>commons-lang</groupId>
        <artifactId>commons-lang</artifactId>
        <version>2.6</version>
        </dependency>

    </dependencies>

配置文件

spring:
  rabbitmq:
    host: 192.168.66.10
    port: 5672
    username: guest
    password: guest

RabbitMQ配置类

@Configuration
public class RabbitConfig {
   
   
 
    @Bean
    public Queue helloQueue() {
   
   
        return new Queue("hello");
    }
 
}

Websocket配置类

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
   
   
 
    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
   
   
        /**
         * 配置简单的消息代理
         */
        config.enableSimpleBroker("/topic","/all");
 
        /**
         * 客户端发送过来的消息，需要以"/app"为前缀，再经过Broker转发给响应的Controller
         */
        config.setApplicationDestinationPrefixes("/app");
    }
 
    @Override
    public