JMS 入门Demo

JMS介绍

JMS是java消息服务应用的接口，是java平台面向消息中间件的一套规范的java API接口，用于两个应用程序之间或分布式系统中发消息，进行异步通信。

简单来说，JMS和消息中间件的关系类似于JDBC与数据库的关系

JMS使用（以Active为例）

1.Maven依赖

<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-simple</artifactId>
			<version>1.7.25</version>
			<scope>compile</scope>
		</dependency>

		<dependency>
			<groupId>org.apache.activemq</groupId>
			<artifactId>activemq-all</artifactId>
			<version>5.15.9	</version>
			<scope>compile</scope>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.4.4</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-core</artifactId>
			<version>2.4.4</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-annotations</artifactId>
			<version>2.4.4</version>
		</dependency>

2.启动MQ

public class StaterMQ {
    public static void main(String[] args) throws Exception {
        BrokerService brokerService = new BrokerService();
        brokerService.setBrokerName("EmbedMQ");
        brokerService.addConnector("tcp://localhost:6000");
        brokerService.setManagementContext(new ManagementContext());
        brokerService.start();
    }
}

3.生产者

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

public class JmsProducer {

	// 默认连接用户名
	private static final String USERNAME = ActiveMQConnection.DEFAULT_USER;
	// 默认连接密码
	private static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD;
	// 默认连接地址
	private static final String BROKEURL = "tcp://localhost:6000";
	// 发送的消息数量
	private static final int SENDNUM = 10;

	public static void main(String[] args) {
		ConnectionFactory connectionFactory;
		Connection connection = null;
		Session session;
		Destination destination;
		MessageProducer messageProducer;

		connectionFactory = new ActiveMQConnectionFactory(USERNAME, PASSWORD, BROKEURL);

		try {
			connection = connectionFactory.createConnection();
			connection.start();
			session = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
			destination = session.createTopic("EmbedMQ");
			messageProducer = session.createProducer(destination);
			for (int i = 0; i < SENDNUM; i++) {
				String msg = " 发送" + i + " " + System.currentTimeMillis();
				TextMessage message = session.createTextMessage(msg);
				System.out.println("发送消息:" + msg);
				messageProducer.send(message);
			}
			session.commit();

		} catch (JMSException e) {
			e.printStackTrace();
		} finally {
			if (connection != null) {
				try {
					connection.close();
				} catch (JMSException e) {
					e.printStackTrace();
				}
			}
		}

	}

}

4.消费者

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

public class JmsConsumer {

	private static final String USERNAME = ActiveMQConnection.DEFAULT_USER;// 默认连接用户名
	private static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD;// 默认连接密码
	private static final String BROKEURL = "tcp://localhost:6000";// 默认连接地址

	public static void main(String[] args) {
		ConnectionFactory connectionFactory;// 连接工厂
		Connection connection = null;// 连接

		Session session;// 会话 接受或者发送消息的线程
		Destination destination;// 消息的目的地

		MessageConsumer messageConsumer;// 消息的消费者

		// 实例化连接工厂
		connectionFactory = new ActiveMQConnectionFactory(JmsConsumer.USERNAME, JmsConsumer.PASSWORD,
				JmsConsumer.BROKEURL);

		try {
			// 通过连接工厂获取连接
			connection = connectionFactory.createConnection();
			// 启动连接
			connection.start();
			// 创建session
			session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
			// 创建一个连接HelloWorld的消息队列
			destination = session.createTopic("EmbedMQ");

			// 创建消息消费者
			messageConsumer = session.createConsumer(destination);
			messageConsumer.setMessageListener(new MessageListener() {
				public void onMessage(Message message) {
					try {
						System.out.println("Accept msg : " + ((TextMessage) message).getText());
					} catch (JMSException e) {
						e.printStackTrace();
					}
				}
			});

		} catch (JMSException e) {
			e.printStackTrace();
		} finally {
			try {
				if (connection != null) {
					connection.close();
				}
			} catch (JMSException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

	}
}