要連接到RabbitMQ集群，需要使用RabbitMQ的Java客戶端庫。以下是連接RabbitMQ集群的基本步驟：
<dependency>
<groupId>com.rabbitmq</groupId>
<artifactId>amqp-client</artifactId>
<version>5.1.2</version>
</dependency>
ConnectionFactory factory = new ConnectionFactory();
factory.setUsername("guest");
factory.setPassword("guest");
factory.setVirtualHost("/");
factory.setHost("rabbitmq1.example.com,rabbitmq2.example.com,rabbitmq3.example.com");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.basicPublish("exchangeName", "routingKey", null, "Hello, RabbitMQ!".getBytes());
channel.close();
connection.close();
這樣就可以連接到RabbitMQ集群并與之通信了。請注意，連接到RabbitMQ集群時，需要確保你的應用程序可以訪問集群中的所有節點。
