In-depth understanding of the technical principles of the Jakarta Messaging API framework in the Java class library Cure
In -depth understanding of the technical principles of Jakarta Messaging API framework in the Java class library
Summary:
Jakarta Messaging API is a message transmission framework widely used in the Java class library.It provides developers with a method of reliably sending and receiving messages in a distributed system.This article will explore the technical principles of Jakarta Messaging API and help readers better understand through the Java code example.
introduction:
In modern distributed systems, message transmission is a common communication mode.It allows different applications to communicate between sending and receiving messages.To achieve this model, developers need to choose a proper message transmission framework.Jakarta Messaging API is designed to meet this needs.
1. The architecture of Jakarta Messaging API
The core idea of the Jakarta Messaging API is to pass the message as an asynchronous communication between producers and consumers.It consists of the following important components:
1. ConnectionFactory: For the creation of the connected factory class.It allows applications to connect to message proxy through different protocols (such as AMQP, MQTT, etc.).
2. Connection: The connection between the representative and the message agent.It provides a method for creating a session object.
3. Session: Representative session objects.It provides a way to create message producers and consumers.
4. MESSAGEPRODUCER: Objects used to send messages.Developers can use it to create a message and send it to the specified target.
5. MessageConsumer: Objects used to receive messages.Developers can use it to receive messages and processes them accordingly.
2. Basic steps for news transmission
Merchants using Jakarta Messaging API usually include the following basic steps:
1. Create the ConnectionFactory object: Create a ConnectionFactory instance by specifying the URL and other related information of a message proxy.
2. Create Connection object: Create a connection to message proxy by calling the CreateConnection () method of ConnectionFactory.
3. Create a session object: Create the session object by calling the CreateSession () method of Connection.
4. Create a message producer/consumer: Create a message producer or consumer object by calling the CreateProducer ()/CreateConsumer () method of Session.
5. Create message: If it is a message producer, you can use methods such as the createtextMessage () of Session to create message objects and set the message content.
6. Send/Receive Message: Use messages producers to send messages or messages to receive messages.
7. Close resources: After completing the message, you need to release connections, sessions and other related resources.
Third, use Java code example description
The following is a simple sample code for sending and receiving text messages using Jakarta Messaging API:
import javax.jms.*;
public class MessageSenderReceiver {
private static final String BROKER_URL = "tcp://localhost:61616";
private static final String QUEUE_NAME = "myQueue";
public static void main(String[] args) {
ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(BROKER_URL);
Connection connection = null;
Session session = null;
MessageProducer producer = null;
MessageConsumer consumer = null;
try {
// Create a connection
connection = connectionFactory.createConnection();
connection.start();
// Create the meeting
session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Create message targets
Destination destination = session.createQueue(QUEUE_NAME);
// Create message producers
producer = session.createProducer(destination);
// Create message Consumers
consumer = session.createConsumer(destination);
// Create text messages
TextMessage message = session.createTextMessage("Hello, Jakarta Messaging!");
// Send a message
producer.send(message);
System.out.println ("Message is successful!");
// Receive messages
Message receivedMessage = consumer.receive();
if (receivedMessage instanceof TextMessage) {
TextMessage textMessage = (TextMessage) receivedMessage;
System.out.println ("Receive message:" + TextMessage.gettext ());
}
} catch (JMSException e) {
e.printStackTrace();
} finally {
// Close the resource
try {
if (producer != null) producer.close();
if (consumer != null) consumer.close();
if (session != null) session.close();
if (connection != null) connection.close();
} catch (JMSException e) {
e.printStackTrace();
}
}
}
}
The sample program uses Apache ActiveMQ as a message proxy and creates a message queue.It first creates connection, session and message producers and consumer objects.It then created a text message and sent through a message producer.After receiving the message, the message consumers are processed and printed out the content of the message.
in conclusion:
This article deeply explores the technical principles of the Jakarta Messaging API framework in the Java library, and provides the corresponding Java code example.Readers can better understand and apply the basic principles and usage of Jakarta Messaging API by reading this article.
