Message transmission framework in the Java class library -Java Ee JMS API Introduction

Java Ee JMS API Introduction JMS (Java Message Service) API in Java EEERPRISE EDITION is a message transmission framework for building distributed applications.It provides a reliable way to pass messages between different applications without having to pay attention to the details of the bottom layer. JMS is a message transmission mechanism based on the Message Queue model.It uses the decoupling of producers (Producer) and consumers to achieve message transmission.Producers are responsible for creating and sending messages, and consumers are responsible for receiving and processing messages.This decoupling mechanism makes applications easier to expand and collaborate. Java Ee provides a standard message transmission solution on the JMS API as a standard message transmission solution on the Java platform.Here are some main concepts and components in the JMS API: 1. Connection Factory: Connect the factory to create a connection with JMS providers.It is a factory that creates a connection object. Applications can use connection objects to communicate with JMS providers. 2. Connection: Connection represents a communication link between the application and the JMS provider.Applications can create a session through the connection object. 3. SESSION: Session is the context between producers and consumers.It is responsible for creating messages, sending messages, and receiving and processing messages. 4. Destination: Destination is the end of message transmission, which can be queue or topic.The queue is a Point-to-Point model, and a message can only be accepted by one consumer; the theme is a PUBLISH-SUBSCRIBE model, and a message can be received by multiple subscribers. 5. Producer: Producers are responsible for creating and sending messages.It can send the message to the destination through the session object. 6. Consume: Consumers are responsible for receiving and processing messages.It can receive messages from the destination through the session object. The following is a simple example code that shows how to send and receive messages with Java Ee JMS API: // Send a message ConnectionFactory ConnectionFactory = New ActiveMQConnectionFactory (); // Create connecting the factory Connection connection = connectionFactory.createconnection (); // Create a connection Session session = connection.createSession (false, session.auto_acknowledge); // Destination Destination = Session.createqueue ("Myqueue"); // Create a queue destination MessageProducer Producer = Session.createProducer (DESTINATION); // Create a producer TextMessage Message = Session.createtextMessage ("Hello, JMS!"); // Create text messages Producer.send (MESSAGE); // Send message // Receive messages MessageConsumer Consumer = Session.createConsumer (Destination); // Create consumers connection.start (); // Start the connection Message ReceivedMessage = Consumer.Receive (); // Receive messages if (receivedMessage instanceof TextMessage) { TextMessage textMessage = (TextMessage) receivedMessage; String text = textMessage.getText(); System.out.println("Received message: " + text); } session.close (); // Close the session connection.close (); // Close the connection Through this example code, we can see the basic process of sending and receiving messages using JMS API.First, we create a connection factory and use it to create a connection.Then, we created a session and created a destination (queue) in the session.Next, we use the session to create a producer and send a message.Finally, we create a consumer and receive messages. To sum up, the JMS API is a powerful and flexible message transmission framework in Java EE, which can help us build distributed applications with scalable and collaborative jobs.With the JMS API, we can easily implement the message sending and receiving, thereby effectively decoupled different modules of the application.