The practical experience sharing of Rabbitmq message queue in Java development
Rabbitmq is a widely used message queue software that is widely used in Java development to achieve reliable asynchronous communication.This article will share with you the practical experience of the Rabbitmq message queue in Java development, and provide relevant Java code examples.
Topic 1: Installation and configuration of rabbitmq
Before starting to use Rabbitmq, installation and configuration must be performed.The following is an example of installing and configured Rabbitmq in Java development:
Step 1: Install erlang
Rabbitmq runs on the Erlang virtual machine, so Erlang is first installed.Execute the following commands in the command line for installation:
brew install erlang
Step 2: Install Rabbitmq
Perform the following commands in the command line for Rabbitmq installation:
brew install rabbitmq
Step 3: Start the Rabbitmq server
Perform the following commands to start the RabbitMQ server:
rabbitmq-server
Step 4: Configure Rabbitmq
By visiting http: // localhost: 15672, you can open the web management interface of Rabbitmq.The default username and password are "gueest". After logging in, you can perform some basic configurations, such as creating virtual hosting, creating users, and setting permissions.
Topic 2: Use Rabbitmq to send and receive messages
In Java development, we can use the Java client library provided by Rabbitmq to send and receive messages.The following is an example of the code sending and receiving by Rabbitmq for message sending and receiving:
1. Connect to the Rabbitmq server:
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
2. Send message to the queue:
String queueName = "my_queue";
channel.queueDeclare(queueName, false, false, false, null);
String message = "Hello, RabbitMQ!";
channel.basicPublish("", queueName, null, message.getBytes("UTF-8"));
System.out.println("Sent message: " + message);
3. Receive messages and consume:
channel.queueDeclare(queueName, false, false, false, null);
Consumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String message = new String(body, "UTF-8");
System.out.println("Received message: " + message);
}
};
channel.basicConsume(queueName, true, consumer);
In the above code example, we first established a connection with the RabbitMQ server and created a message queue.Then use the `BasicPublish` method to send the message to the queue.Finally, register a consumer to receive and consume messages using the `BasicConsume` method.
Topic 3: Rabbitmq message durable
In some cases, we may want to ensure that the message will not be lost even after the RabbitMQ server collapses or restarts.In order to achieve the persistence of the message, we can mark the queues and messages as persistence.The following is a code example:
1. Create a persistent queue:
boolean durable = true;
channel.queueDeclare(queueName, durable, false, false, null);
Here, we set the second parameter to `true` to represent the creation of a long -lasting queue.
2. Send persistent news:
AMQP.BasicProperties properties = MessageProperties.PERSISTENT_TEXT_PLAIN;
channel.basicPublish("", queueName, properties, message.getBytes("UTF-8"));
By the parameters of the `Persistent_text_pLaleIn_Text_plain` attribute of` MessageProperties` as parameters of the `BasicPublish` method, we can mark the message as persistence.
Through the above methods, we can ensure that the message will not be lost even after the RabbitMQ server collapses or restarts.
In summary, this article introduces the practical experience of using the RabbitMQ message queue in Java development.We shared the installation and configuration process of Rabbitmq, and provided code examples for sending and receiving by message sending and receiving using RabbitMQ.In addition, we also introduce how to achieve the durable news to ensure the reliability of the message.I hope this article will help and guide you use Rabbitmq in Java development.
