RabbitMQ——quick start

于 2023-02-27 15:37:06 发布
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分类专栏： JavaWEB 文章标签： rabbitmq
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本文链接：https://blog.youkuaiyun.com/qq_46599129/article/details/129230083
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Hello World

RabbitMQ工作图示：

(P) -> [|||] -> (C)

如上图：

P代表Producing，也就是消息的发送程序

中间的队列代表消息将会被存到对应的队列中。可以多个Producers向同一个队列发送消息，也可以多个Consumer接收同一个队列的消息

C代表Consumer，也就是等待接收消息的程序

需要的依赖：

<!-- https://mvnrepository.com/artifact/com.rabbitmq/amqp-client -->
<dependency>
    <groupId>com.rabbitmq</groupId>
    <artifactId>amqp-client</artifactId>
    <version>5.7.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.25</version>
    <scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.9</version>
</dependency>

程序实例：

Producers

private final static String QUEEN_NAME = "hello";

public static void main(String[] args) {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("101.33.239.187");
    // Connection 负责版本协商以及身份认证工作
    // Chanel 包含了大部分任务所需的API
    try (Connection connection = factory.newConnection(); Channel channel = connection.createChannel()) {
        channel.queueDeclare(QUEEN_NAME, false, false, false, null);
        channel.basicPublish("", QUEEN_NAME, null, ("Hello RabbitMQ!" + Math.random()).getBytes(StandardCharsets.UTF_8));
    } catch (IOException | TimeoutException e) {
        e.printStackTrace();
    }
}

Consumers

 private final static String QUEEN_NAME = "hello";

public static void main(String[] args) throws IOException, TimeoutException {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("101.33.239.187");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();
    channel.queueDeclare(QUEEN_NAME, false, false, false, null);
    System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
    DeliverCallback callback = (consumerTag, delivery) -> {
        String msg = new String(delivery.getBody(), StandardCharsets.UTF_8);
        System.out.println(" [x] Received '" + msg + "'");
    };
    channel.basicConsume(QUEEN_NAME, true, callback, (consumerTag) -> {});
}

channel.basicConsume会阻塞进程有消息通知时会调用callback

PS：备注

  1. 如果有多个消费者，那么队列中的消息将会按照消费者队列进行依次递送

  2. rabbitmqctl list_queues 可以展示所有的队列信息

Hello World

RabbitMQ工作图示：

(P) -> [|||] -> (C)

如上图：

P代表Producing，也就是消息的发送程序

中间的队列代表消息将会被存到对应的队列中。可以多个Producers向同一个队列发送消息，也可以多个Consumer接收同一个队列的消息

C代表Consumer，也就是等待接收消息的程序

需要的依赖：

<!-- https://mvnrepository.com/artifact/com.rabbitmq/amqp-client -->
<dependency>
    <groupId>com.rabbitmq</groupId>
    <artifactId>amqp-client</artifactId>
    <version>5.7.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.25</version>
    <scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.9</version>
</dependency>

程序实例：

Producers

private final static String QUEEN_NAME = "hello";

public static void main(String[] args) {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("101.33.239.187");
    // Connection 负责版本协商以及身份认证工作
    // Chanel 包含了大部分任务所需的API
    try (Connection connection = factory.newConnection(); Channel channel = connection.createChannel()) {
        channel.queueDeclare(QUEEN_NAME, false, false, false, null);
        channel.basicPublish("", QUEEN_NAME, null, ("Hello RabbitMQ!" + Math.random()).getBytes(StandardCharsets.UTF_8));
    } catch (IOException | TimeoutException e) {
        e.printStackTrace();
    }
}

Consumers

 private final static String QUEEN_NAME = "hello";

public static void main(String[] args) throws IOException, TimeoutException {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("101.33.239.187");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();
    channel.queueDeclare(QUEEN_NAME, false, false, false, null);
    System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
    DeliverCallback callback = (consumerTag, delivery) -> {
        String msg = new String(delivery.getBody(), StandardCharsets.UTF_8);
        System.out.println(" [x] Received '" + msg + "'");
    };
    channel.basicConsume(QUEEN_NAME, true, callback, (consumerTag) -> {});
}

channel.basicConsume会阻塞进程有消息通知时会调用callback

PS：备注

  1. 如果有多个消费者，那么队列中的消息将会按照消费者队列进行依次递送

  2. rabbitmqctl list_queues 可以展示所有的队列信息

Hello World

RabbitMQ工作图示：

(P) -> [|||] -> (C)

如上图：

P代表Producing，也就是消息的发送程序

中间的队列代表消息将会被存到对应的队列中。可以多个Producers向同一个队列发送消息，也可以多个Consumer接收同一个队列的消息

C代表Consumer，也就是等待接收消息的程序

需要的依赖：

<!-- https://mvnrepository.com/artifact/com.rabbitmq/amqp-client -->
<dependency>
    <groupId>com.rabbitmq</groupId>
    <artifactId>amqp-client</artifactId>
    <version>5.7.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.25</version>
    <scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.9</version>
</dependency>

程序实例：

Producers

private final static String QUEEN_NAME = "hello";

public static void main(String[] args) {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("101.33.239.187");
    // Connection 负责版本协商以及身份认证工作
    // Chanel 包含了大部分任务所需的API
    try (Connection connection = factory.newConnection(); Channel channel = connection.createChannel()) {
        channel.queueDeclare(QUEEN_NAME, false, false, false, null);
        channel.basicPublish("", QUEEN_NAME, null, ("Hello RabbitMQ!" + Math.random()).getBytes(StandardCharsets.UTF_8));
    } catch (IOException | TimeoutException e) {
        e.printStackTrace();
    }
}

Consumers

 private final static String QUEEN_NAME = "hello";

public static void main(String[] args) throws IOException, TimeoutException {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("101.33.239.187");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();
    channel.queueDeclare(QUEEN_NAME, false, false, false, null);
    System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
    DeliverCallback callback = (consumerTag, delivery) -> {
        String msg = new String(delivery.getBody(), StandardCharsets.UTF_8);
        System.out.println(" [x] Received '" + msg + "'");
    };
    channel.basicConsume(QUEEN_NAME, true, callback, (consumerTag) -> {});
}

channel.basicConsume会阻塞进程有消息通知时会调用callback

PS：备注

  1. 如果有多个消费者，那么队列中的消息将会按照消费者队列进行依次递送

  2. rabbitmqctl list_queues 可以展示所有的队列信息

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