RabbitMQ學習筆記-HelloWorld

蝸牛的殼發表於2018-12-21
MQ筆記

在IDEA中新建一個Maven工程，並新增 RabbitMQ Java client依賴

<dependencies>
        <dependency>
            <groupId>com.rabbitmq</groupId>
            <artifactId>amqp-client</artifactId>
            <version>5.5.1</version>
        </dependency>
</dependencies>
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新建Send.java檔案,先不要關心方法及每個引數的具體作用

public class Send {
    private final static String QUEUE_NAME = "hello";

    public static void main(String[] args) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        try (Connection connection = factory.newConnection();
             Channel channel = connection.createChannel()) {
            channel.queueDeclare(QUEUE_NAME, false, false, false, null);
            String message = "Hello World!";
            channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
            System.out.println(" [x] Sent '" + message + "'");
        }
    }
}
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新建Recv.java檔案

public class Recv {
    private final static String QUEUE_NAME = "hello";

    public static void main(String[] args) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        System.out.println(" [*] Waiting for messages.");

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" + message + "'");
        };
        channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> { });
    }
}
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啟動RabbitMQ Server

brew services start rabbitmq
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執行 Send.main()，控制檯輸出如下：

[x] Sent 'Hello World!'
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執行Recv.main()，控制檯輸出如下：

 [*] Waiting for messages.
 [x] Received 'Hello World!'
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簡單概念

RabbitMQ是一個訊息代理，負責接收和轉發訊息。

RabbitMQ

P代表訊息的傳送者(producer)，比如上面的Send類。

C代表訊息的接收者(consumer),比如上面的Recv類。

中間紅色的圖片代表訊息佇列(message queue)。訊息佇列可以通過名稱標識，比如上面的"hello"。

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