Use the RabBitmq framework for asynchronous message processing in the Java class library
Use the RabBitmq framework for asynchronous message processing in the Java class library
Rabbitmq is a powerful message agent that provides reliable, flexible, scalable asynchronous message processing capabilities.In the Java library, using Rabbitmq can simplify communication between applications and improve the reliability and fault tolerance of the system.This article will introduce how to use the Rabbitmq framework for asynchronous message processing in the Java class library, and attach the corresponding Java code example.
1. Installation and configuration Rabbitmq
First, you need to install and configure Rabbitmq in a local environment.You can download and install the latest Rabbitmq version from the official website of Rabbitmq, and configure according to the official documentation.
2. Add Rabbitmq dependencies
In the pom.xml file of the Java library project, add Rabbitmq dependency items.The example code is as follows:
<dependency>
<groupId>com.rabbitmq</groupId>
<artifactId>amqp-client</artifactId>
<version>5.7.3</version>
</dependency>
After completing the above steps, you can start writing the Java code to achieve asynchronous message processing based on Rabbitmq.
3. Post message
To release messages, first of all, you need to create a ConnectionFactory object connected to Rabbitmq and set the corresponding connection parameters.The example code is as follows:
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
factory.setUsername("guest");
factory.setPassword("guest");
try (Connection connection = factory.newConnection();
Channel channel = connection.createChannel()) {
String queueName = "my_queue";
String message = "Hello, RabbitMQ!";
channel.queueDeclare(queueName, false, false, false, null);
channel.basicPublish("", queueName, null, message.getBytes());
System.out.println ("The message has been released:" + message);
}
In the above code, we created a message queue called "My_queue", and sent the message "Hello, Rabbitmq!" Use the Channel.BasicPublish method to the queue.
4. Consumption message
To consumer news, first of all, you need to create a consumer object and set up consumer procedures.The example code is as follows:
class MessageConsumer extends DefaultConsumer {
public MessageConsumer(Channel channel) {
super(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 ("Receive message:" + Message);
// Manual confirmation message has been processed
getChannel().basicAck(envelope.getDeliveryTag(), false);
}
}
public class RabbitMQConsumer {
public static void main(String[] args) throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
factory.setPort(5672);
factory.setUsername("guest");
factory.setPassword("guest");
try (Connection connection = factory.newConnection();
Channel channel = connection.createChannel()) {
String queueName = "my_queue";
channel.queueDeclare(queueName, false, false, false, null);
Channel.basicqos (1); // Just process one message each time
System.out.println ("Waiting for receiving messages ...");
MessageConsumer consumer = new MessageConsumer(channel);
channel.basicConsume(queueName, false, consumer);
}
}
}
In the above code, we created a message queue called "My_queue" and created a MESSAGECONSUMER class, which inherited from the DefaultConsumer and was mainly used to process the received messages.In the main method of the RabbitmqConsumer class, we first create a connection with Rabbitmq, and then create a message consumer associated with the queue "My_queue", and finally wait for the message and process it.
Through the above code examples, we can use the use of the Rabbitmq framework for asynchronous message processing in the Java library.Through the rich features provided by Rabbitmq, we can easily realize the reliable, flexible and efficient message communication between applications.
