Intellij IDEA 创建消息驱动Bean - 接收JMS消息

2023-01-08 22:33:32

除了同步方式的调用之外，有时还需要异步调用，用来处理不需要即时处理的信息，例如短信、邮件等，这需要使用EJB中的独特组件——消息驱动Bean（Message-Driven Bean，MDB），它提供了Java消息服务JMS（Java Messaging Service）的处理能力，由消息驱动Bean来处理JMS消息。JMS的消息由客户端程序产生，并被发布到服务器的消息队列，消息驱动Bean随之检索消息并执行其内容。这种事件或者数据的通信就称为异步形式，客户端或者服务端Bean都无须依赖对方的直接响应。

参考：

1）JBoss EAP应用服务器部署方法和JBoss 开发JMS消息服务小例子：http://blog.chinaunix.net/uid-200142-id-4679098.html

2）JBoss 7/WildFly中配置使用JMS消息队列：http://www.tuicool.com/articles/Vf6bYv

3）Eclipse+JBoss+EJB3消息驱动Bean：http://developer.51cto.com/art/200906/131361.htm

4）EJB学习笔记——JMS和消息驱动Bean：http://blog.csdn.net/chjttony/article/details/6072775

5）消息驱动bean（MDB）：http://blog.chinaunix.net/uid-20749563-id-718290.html

6）jboss 7.1.1 消息驱动bean配置：http://jeremy102.iteye.com/blog/1706852

7）Jboss7 JMS demo：http://lym6520.iteye.com/blog/1600630

构建JMB的消息驱动Bean（Message-Driven Bean）有4中方式：

Management Console
Management CLI
部署*-jms.xml 文件到 deployments目录
编辑JBoss配置文件

JMS消息的两种类型：队列（Queue）与主题（Topic）

在JMS中有以下两种类型的目的地（Destination）：

· 队列（Queue）：用于保存从一个JMS客户端发往另一个JMS客户端的消息，这种消息模式被称为点对点（Point-To-Point）模式；

· 主题（Topic）：用于保存从许多潜在的JMS客户端发往多个潜在的JMS客户端的消息，这种消息模型被称为发布/订阅（Public/Subscribe）模式。

使用最简单的创建MDB的方法：编辑JBoss配置文件的方法。

1、找到JBoss安装路径的这个文件：C:\jboss-as-7.1.1.Final\standalone\configuration\standalone-full.xml。找到

<hornetq-server>

　　<jms-destinations>

　　</jms-destinations>

</hornetq-server>

在中间加上新创建的MDB的内容：

<jms-queue name="HelloWorldMDBQueue">

    <entry name="java:jboss/exported/jms/queue/HelloWorldMDBQueue"/>

</jms-queue>

<jms-topic name="HelloWorldMDBTopic">

    <entry name="java:jboss/exported/jms/topic/HelloWorldMDBTopic"/>

</jms-topic>

2、使用命令行方式启动JBoss：

切换到JBoss安装路径下的bin目录下：cd C:\jboss-as-7.1.1.Final\bin

启动命令：standalone.bat --server-config=standalone-full.xml

3、编写队列模式的测试代码：

1）消息生成者：

package com.ejb.mdb;

import javax.jms.*;

import javax.naming.Context;

import javax.naming.InitialContext;

import java.util.Properties;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.TimeUnit;

import java.util.logging.Logger;

/**

 * Created by gao on 16-3-28.

 */

public class JMSProducer {

    private static final Logger log = Logger.getLogger(JMSProducer.class.getName());

    private static final String DEFAULT_MESSAGE = "这是JMS信息.....";

    private static final String DEFAULT_CONNECTION_FACTORY = "jms/RemoteConnectionFactory";

    private static final String DEFAULT_DESTINATION = "/jms/queue/HelloWorldMDBQueue";

    private static final String DEFAULT_MESSAGE_COUNT = "10";

    private static final String DEFAULT_USERNAME = "yuqin";

    private static final String DEFAULT_PASSWORD = "123456";

    private static final String INITIAL_CONTEXT_FACTORY = "org.jboss.naming.remote.client.InitialContextFactory";

    private static final String PROVIDER_URL = "remote://localhost:4447";

    public static void main(String[] args) throws Exception {

        Context context=null;

        Connection connection=null;

        try {

            // 设置上下文的JNDI查找

            log.info("设置JNDI访问环境信息也就是设置应用服务器的上下文信息!");

            final Properties env = new Properties();

            env.put(Context.INITIAL_CONTEXT_FACTORY, INITIAL_CONTEXT_FACTORY);// 该KEY的值为初始化Context的工厂类,JNDI驱动的类名

            env.put(Context.PROVIDER_URL, PROVIDER_URL);// 该KEY的值为Context服务提供者的URL.命名服务提供者的URL

            env.put(Context.SECURITY_PRINCIPAL, DEFAULT_USERNAME);

            env.put(Context.SECURITY_CREDENTIALS, DEFAULT_PASSWORD);//应用用户的登录名,密码.

            // 获取到InitialContext对象.

            context = new InitialContext(env);

            log.info("初始化上下文,'JNDI驱动类名','服务提供者URL','应用用户的账户','密码'完毕.");

            log.info("获取连接工厂!");

            ConnectionFactory connectionFactory = (ConnectionFactory) context.lookup(DEFAULT_CONNECTION_FACTORY);

            log.info("获取目的地!");

            Destination destination = (Destination) context.lookup(DEFAULT_DESTINATION);

            // 创建JMS连接、会话、生产者和消费者

            connection = connectionFactory.createConnection(DEFAULT_USERNAME, DEFAULT_PASSWORD);

            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

            MessageProducer producer = session.createProducer(destination);

            connection.start();

            int count = Integer.parseInt(DEFAULT_MESSAGE_COUNT);

            // 发送特定数目的消息

            TextMessage message = null;

            for (int i = 0; i < count; i++) {

                message = session.createTextMessage(DEFAULT_MESSAGE);

                producer.send(message);

                log.info("message:"+message);

                log.info("message:"+DEFAULT_MESSAGE);

            }

            // 等待30秒退出

            CountDownLatch latch = new CountDownLatch(1);

            latch.await(30, TimeUnit.SECONDS);

        } catch (Exception e) {

            log.severe(e.getMessage());

            throw e;

        } finally {

            if (context != null) {

                context.close();

            }

            // 关闭连接负责会话,生产商和消费者

            if (connection != null) {

                connection.close();

            }

        }

    }

}

2）消息消费者：

package com.ejb.mdb;

import javax.jms.*;

import javax.naming.Context;

import javax.naming.InitialContext;

import java.util.Properties;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.TimeUnit;

import java.util.logging.Logger;

/**

 * Created by gao on 16-3-28.

 */

public class JMSConsumer {

    private static final Logger log = Logger.getLogger(JMSConsumer.class.getName());

    private static final String DEFAULT_CONNECTION_FACTORY = "jms/RemoteConnectionFactory";

    private static final String DEFAULT_DESTINATION = "/jms/queue/HelloWorldMDBQueue";

    private static final String DEFAULT_USERNAME = "yuqin";

    private static final String DEFAULT_PASSWORD = "123456";

    private static final String INITIAL_CONTEXT_FACTORY = "org.jboss.naming.remote.client.InitialContextFactory";

    private static final String PROVIDER_URL = "remote://localhost:4447";

    private static final int WAIT_COUNT = 5;

    public static void main(String[] args) throws Exception {

        ConnectionFactory connectionFactory = null;

        Connection connection = null;

        Session session = null;

        MessageConsumer consumer = null;

        Destination destination = null;

        TextMessage message = null;

        Context context = null;

        try {

            final Properties env = new Properties();

            env.put(Context.INITIAL_CONTEXT_FACTORY, INITIAL_CONTEXT_FACTORY);

            env.put(Context.PROVIDER_URL, PROVIDER_URL);

            env.put(Context.SECURITY_PRINCIPAL, DEFAULT_USERNAME);

            env.put(Context.SECURITY_CREDENTIALS, DEFAULT_PASSWORD);

            context = new InitialContext(env);

            connectionFactory = (ConnectionFactory) context.lookup(DEFAULT_CONNECTION_FACTORY);

            destination = (Destination) context.lookup(DEFAULT_DESTINATION);

            connection = connectionFactory.createConnection(DEFAULT_USERNAME, DEFAULT_PASSWORD);

            session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

            consumer = session.createConsumer(destination);

            connection.start();

            // 等待30秒退出

            CountDownLatch latch = new CountDownLatch(1);

            log.info("开始从JBOSS端接收信息-----");

            int i = 0;

            for (; i < WAIT_COUNT; i++) {

                if (message != null) {

                    log.info("接收到的消息的内容:" + message.getText());

                    i = 0;

                }

                log.info("开始从JBOSS端接收信息-----");

                message = (TextMessage) consumer.receive(5000);

                latch.await(1, TimeUnit.SECONDS);

            }

        } catch (Exception e) {

            log.severe(e.getMessage());

            throw e;

        } finally {

            if (context != null) {

                context.close();

            }

            if (connection != null) {

                connection.close();

            }

        }

    }

}

3）运行：

先运行消息消费者，用来监听消息，然后再运行消息生成者。

4、编写主题模式的测试代码：

1）消息订阅者：

package com.ejb.mdb;

import javax.jms.*;

import javax.naming.Context;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import java.util.Properties;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.TimeUnit;

import java.util.logging.Logger;

/**

 * Created by gao on 16-3-28.

 */

public class JMSSub {

    private static final String DEFAULT_USERNAME = "yuqin";

    private static final String DEFAULT_PASSWORD = "123456";

    private static final String INITIAL_CONTEXT_FACTORY = "org.jboss.naming.remote.client.InitialContextFactory";

    private static final String PROVIDER_URL = "remote://localhost:4447";

    private static final String DEFAULT_CONNECTION_FACTORY = "jms/RemoteConnectionFactory";

    private static final Logger log = Logger.getLogger(JMSSub.class.getName());

    /**

     * @param args

     * @throws Exception

     */

    public static void main(String[] args) throws Exception {

        ConnectionFactory connectionFactory = null;

        Connection connection = null;

        Session session = null;

        Topic topic = null;

        Context context = null;

        MessageConsumer consumer = null;

        try {

            log.info("设置JNDI访问环境信息也就是设置应用服务器的上下文信息!");

            final Properties env = new Properties();

            env.put(Context.INITIAL_CONTEXT_FACTORY, INITIAL_CONTEXT_FACTORY);

            env.put(Context.PROVIDER_URL, PROVIDER_URL);

            env.put(Context.SECURITY_PRINCIPAL, DEFAULT_USERNAME);

            env.put(Context.SECURITY_CREDENTIALS, DEFAULT_PASSWORD);

            context = new InitialContext(env);

            log.info("初始化上下文,'JNDI驱动类名','服务提供者URL','应用用户的账户','密码'完毕.");

            log.info("创建JMS连接、会话、主题!");

            connectionFactory = (ConnectionFactory) context.lookup(DEFAULT_CONNECTION_FACTORY);

            connection = connectionFactory.createConnection(DEFAULT_USERNAME, DEFAULT_PASSWORD);

            session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

            topic = session.createTopic("HelloWorldMDBTopic");

            consumer = session.createConsumer(topic);

            consumer.setMessageListener(new javax.jms.MessageListener() {

                public void onMessage(Message message) {

                    try {

                        TextMessage tm = (TextMessage) message;

                        System.out.println("接收到的消息内容: " + tm.getText().toString());

                        System.out.println("JMS目的地: " + tm.getJMSDestination());

                        System.out.println("JMS回复: " + tm.getJMSReplyTo());

                        System.out.println("JMS消息ID号: " + tm.getJMSMessageID());

                        System.out.println("是否重新接收: " + tm.getJMSRedelivered());

                    } catch (JMSException e1) {

                        e1.printStackTrace();

                    }

                }

            });

            connection.start();

            //等待30秒退出

            CountDownLatch latch = new CountDownLatch(1);

            latch.await(100, TimeUnit.SECONDS);

        } catch (Exception e) {

            log.severe(e.getMessage());

            throw e;

        } finally {

            if (context != null) {

                context.close();

            }

            // 关闭连接负责会话,发布者和订阅者

            if (connection != null) {

                connection.close();

            }

        }

    }

}

2）消息发布者：

package com.ejb.mdb;

import javax.jms.*;

import javax.naming.Context;

import javax.naming.InitialContext;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.util.Properties;

import java.util.logging.Logger;

/**

 * Created by gao on 16-3-28.

 */

public class JMSPub {

    private static final String DEFAULT_USERNAME = "yuqin";

    private static final String DEFAULT_PASSWORD = "123456";

    private static final String INITIAL_CONTEXT_FACTORY = "org.jboss.naming.remote.client.InitialContextFactory";

    private static final String PROVIDER_URL = "remote://localhost:4447";

    private static final String DEFAULT_CONNECTION_FACTORY = "jms/RemoteConnectionFactory";

    private static final String DEFAULT_DESTINATION = "/jms/topic/HelloWorldMDBTopic";

    private static final Logger log = Logger.getLogger(JMSPub.class.getName());

    public static void main(String[] args) throws Exception {

        ConnectionFactory connectionFactory = null;

        Connection connection = null;

        Session session = null;

        Topic topic = null;

        Context context = null;

        MessageProducer producer = null;

        BufferedReader msgStream = null;

        try {

            log.info("设置JNDI访问环境信息也就是设置应用服务器的上下文信息!");

            final Properties env = new Properties();

            env.put(Context.INITIAL_CONTEXT_FACTORY, INITIAL_CONTEXT_FACTORY);

            env.put(Context.PROVIDER_URL, PROVIDER_URL);

            env.put(Context.SECURITY_PRINCIPAL, DEFAULT_USERNAME);

            env.put(Context.SECURITY_CREDENTIALS, DEFAULT_PASSWORD);

            context = new InitialContext(env);

            log.info("初始化上下文,'JNDI驱动类名','服务提供者URL','应用用户的账户','密码'完毕.");

            log.info("获取连接工厂!");

            connectionFactory = (ConnectionFactory) context.lookup(DEFAULT_CONNECTION_FACTORY);

            log.info("创建JMS连接、会话、主题!");

            connection = connectionFactory.createConnection(DEFAULT_USERNAME, DEFAULT_PASSWORD);

            session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

            topic = (Topic) context.lookup(DEFAULT_DESTINATION);

            producer = session.createProducer(topic);

            msgStream = new BufferedReader(new InputStreamReader(System.in));

            String line = null;

            boolean quitNow = false;

            do {

                System.out.print("输入要发送的消息：(数字0退出)");

                line = msgStream.readLine();

                if (line != null && line.trim().length() != 0) {

                    TextMessage textMessage = session.createTextMessage();

                    textMessage.setText(line);

                    producer.send(textMessage);

                    quitNow = line.equalsIgnoreCase("0");

                }

            } while (!quitNow);

        } catch (Exception e) {

            log.severe(e.getMessage());

            throw e;

        } finally {

            if (context != null) {

                context.close();

            }

            // 关闭连接负责会话,发布者和订阅者

            if (connection != null) {

                connection.close();

            }

        }

    }

}

3）运行：

先运行消息订阅者，监听消息发布者的传过来的消息；然后再运行消息发布者。

5、项目结构图：

码农公寓

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