For details, the technical principles and design of Jakarta Messaging API frameworks in the Java class library a class libraries)

Jakarta Messaging API (previously known as the Java Message Service API) is a framework technology in the Java class library to realize communication between asynchronous communication and coupling applications.This article will explain the technical principles and design of the Jakarta Messaging API, and provide some Java code examples. The design goal of the Jakarta Messaging API is to provide a standard method to send, receive and routing messages in a distributed system to provide reliable asynchronous communication in the distributed system.It uses the producer-consumer model, where the producer creates and sends messages, and consumers receive and process these messages. The core components of the Jakarta Messaging API are Message Broker and Destination.The message agent is the middleman of the message, responsible for receiving the news created by the sender, and passing it to one or more destinations.The destination is the receiver of the message, which can be queue or topic.The queue is used for one -to -one message transmission, and the theme is used for one -to -many message broadcasts. Below is a simple example, showing the process of sending and receiving messages using Jakarta Messaging API: // Create a connection factory ConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616"); // Create a connection Connection connection = factory.createConnection(); // Start the connection connection.start(); // Create the meeting Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); // Create a destination, use the queue here Destination destination = session.createQueue("myQueue"); // Create a producer MessageProducer producer = session.createProducer(destination); // Create messages Message message = session.createTextMessage("Hello, Jakarta Messaging!"); // Send a message producer.send(message); // Create consumers MessageConsumer consumer = session.createConsumer(destination); // Receive messages Message receivedMessage = consumer.receive(); // Treat the message if (receivedMessage instanceof TextMessage) { TextMessage textMessage = (TextMessage) receivedMessage; System.out.println("Received message: " + textMessage.getText()); } // Turn off the connection connection.close(); In the above example, a connection factory and connection are first created, and the connection is started to start communication.Then, create a session and create a queue as a destination as needed.Next, create producers, create messages and send them to the queue.Finally, create a consumer and receive and process messages received from the queue. Jakarta Messaging API also provides some other functions, such as point -to -point message transmission, news durable and transactional support.It can also be integrated with the Java EE container to achieve efficient message transmission in enterprise applications. In short, Jakarta Messaging API is a powerful and flexible asynchronous communication framework in the Java class library.It provides a set of standardized interfaces and components that enable developers to transmit reliable messages in a distributed system.