客户端连接 ~ 消息中间件之四

1. 我们先增加一个帐号

添加root帐号，用户名、密码都为root

rabbitmqctl add_user root root

设置一下主题权限

set_permissions -p / root ".*" ".*" ".*"

设置一下用户角色

rabbitmqctl set_user_tags root administrator

2. 引用maven依赖

这里我们使用rabbitmq的客户端试试看

<dependency>
    <groupId>com.rabbitmq</groupId>
    <artifactId>amqp-client</artifactId>
    <version>5.14.1</version>
</dependency>

3. 消息发送

发送的代码

public class ClientTest {
    private static final String EXCHANGE_NAME = "exchange_basic";
    private static final String ROUTING_KEY = "routingkey_basic";
    private static final String QUEUE_NAME = "queue_basic";
    private static final int PORT = 5672;
    
    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(PORT);
        factory.setUsername("root");
        factory.setPassword("root");
        //创建连接
        Connection conn = factory.newConnection();
        //创建信道
        Channel channel = conn.createChannel();
        //创建一个direct类型，持久化、非自动删除的交换器
        channel.exchangeDeclare(EXCHANGE_NAME, "direct",true, false, null);
        //创建一个持久化、非排他的、非自动删除的队列
        channel.queueDeclare(QUEUE_NAME, true, false, false, null);
        //将交换器与队列通过路由器绑定
        channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, ROUTING_KEY);
        //发送一条消息
        String message = "你好!";
        channel.basicPublish(EXCHANGE_NAME, ROUTING_KEY, MessageProperties.PERSISTENT_TEXT_PLAIN, message.getBytes());
        //关闭
        channel.close();
        conn.close();
    }
}

路由查看

上面代码执行后，在管理页面的exchanges标签页，我们可以看到路由已经成功创建，并发送了一条消息

路由情况.png

队列查看

切换到Queues标签，可以看到队列的详细情况

队列情况.png

4. 接收消息

下面是接收的代码哈，放在刚才的类下，直接调用一下就好了哈

public static void receive() throws IOException, TimeoutException, InterruptedException {
        Address[] addresses = new Address[] {
                new Address("localhost",PORT)
        };
        ConnectionFactory factory = new ConnectionFactory();
        factory.setUsername("root");
        factory.setPassword("root");
        Connection conn = factory.newConnection(addresses);
        final Channel channel = conn.createChannel(); 
        Consumer consumer = new DefaultConsumer(channel) {  

            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)
                    throws IOException {
                System.out.println("收到消息:" + new String(body));
                channel.basicAck(envelope.getDeliveryTag(), false);
            }
            
        };
        channel.basicConsume(QUEUE_NAME, consumer);
        TimeUnit.SECONDS.sleep(5);
        channel.close();
        conn.close();
    }

执行消费代码后，可以看消息成功消费了

消息成功消费.png