JMS和消息驱动Bean(MDB)

一、说明

本示例使用的ActiveMQ作为消息中间件,服务器为Glassfish,使用JMS发送消息,在MDB接收到消息之后做打印输出。

二、ActiveMQ安装配置

1、安装console

war包安装到服务器不需要特殊配置,默认监听端口为61616,可通过修改activemq.xml修改默认端口,测试使用的console版本为activemq-web-console-5.5.1,当然console可以是与客户端不同的服务器,而且我们也一般都这样使用。

2、安装ActiveMq应用端

安装rar包,如果你下载的rar包中缺少slf4j-log4j12的jar包请手工加入,与安装普通的app一样,不需要特殊配置,我采用的为activemq-rar-5.5.0.rar,不同版本对服务器可能会存在兼容性问题。

3、配置服务器

依次配置如下内容:

资源适配器(Resource Adapter Config)
	资源:activemq-rar-5.5.0;
	线程池ID:thread-pool-1
	serverurl:tcp://localhost:61616 [如果console在其他机器,请配置对应机器的IP]
连接器连接池(Connector Connection Pools)
	连接池名字:jms/ConnectionFactory
	资源适配器名:activemq-rar-5.5.0
	连接定义:javax.jms.ConnectionFactory
连接器资源(Connector Resources)
	JNDI名字:jms/ConnectionFactory
	连接池名:jms/ConnectionFactory
受管对象资源(Admin Object Resources)
	JNDI名:jms/JMSINBOX
	资源适配器名:activemq-rar-5.5.0
	资源类型:javax.jms.Queue
	PhysicalName:jmsQueue

三、开发MDB(消息驱动Bean)

1、maven配置

    <dependency>
      <groupId>org.glassfish</groupId>
      <artifactId>javax.ejb</artifactId>
      <version>3.0.1</version>
    </dependency>
  	<dependency>
  	  <groupId>org.glassfish</groupId>
  	  <artifactId>javax.jms</artifactId>
  	  <version>3.0.1</version>
  	  <scope>provided</scope>
  	</dependency>

2、配置/WEB-INF/ejb-jar.xml (glassfish下必须配置)
<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns="http://java.sun.com/xml/ns/javaee" version="3.1"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_1.xsd">
	<display-name>Ejb1</display-name>
	<enterprise-beans>
		<message-driven>
			<display-name>MyMDB</display-name>
			<ejb-name>MyMDB</ejb-name>
			<ejb-class>com.wcs.TestMDB.mdb.MyMDB</ejb-class>
			<messaging-type>javax.jms.MessageListener</messaging-type>
			<transaction-type>Container</transaction-type>
			<activation-config>
				<activation-config-property>
					<activation-config-property-name>DestinationType</activation-config-property-name>
					<activation-config-property-value>javax.jms.Queue</activation-config-property-value>
				</activation-config-property>
				<activation-config-property>
					<activation-config-property-name>Destination</activation-config-property-name>
					<activation-config-property-value>jmsQueue</activation-config-property-value>
				</activation-config-property>
			</activation-config>
		</message-driven>
	</enterprise-beans>
	<assembly-descriptor>
		<container-transaction>
			<method>
				<ejb-name>MyMDB</ejb-name>
				<method-name>onMessage</method-name>
				<method-params>
					<method-param>java.lang.String</method-param>
				</method-params>
			</method>
			<trans-attribute>Required</trans-attribute>
		</container-transaction>
	</assembly-descriptor>
</ejb-jar>

3、配置/WEB-INF/glassfish-ejb-jar.xml (glassfish下必须配置)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glassfish-ejb-jar PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 EJB 3.1//EN" "http://glassfish.org/dtds/glassfish-ejb-jar_3_1-1.dtd">
<glassfish-ejb-jar>
	<enterprise-beans>
		<ejb>
			<ejb-name>MyMDB</ejb-name>
			<mdb-resource-adapter>
				<resource-adapter-mid>activemq-rar-5.5.0</resource-adapter-mid>
			</mdb-resource-adapter>
			<mdb-connection-factory>
				<jndi-name>jms/ConnectionFactory</jndi-name>
			</mdb-connection-factory>
		</ejb>
	</enterprise-beans>
</glassfish-ejb-jar>

4、消息驱动Bean代码

import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;

@MessageDriven(mappedName="jms/JMSINBOX", activationConfig={
	@ActivationConfigProperty(propertyName="acknowledgeMode", propertyValue="Auto-acknowledge")
})
public class MyMDB implements MessageListener {

	public void onMessage(Message arg0) {
		TextMessage msg = (TextMessage) arg0;
		try {
			System.out.println("Message========"+msg.getText());
		} catch (JMSException e) {
			System.out.println("=====Server:JMSException");
			e.printStackTrace();
		}
	}

}

四、开发JMS

1、maven配置
		<dependency>
			<groupId>org.glassfish</groupId>
			<artifactId>javax.jms</artifactId>
			<version>3.0.1</version>
		</dependency>
2、发送消息代码
jms方比较简单,只需要通过jndi获取到连接,然后把消息发送出去即可,下面只粘贴连接获取和发送部分,就不粘贴调用部分代码了。

	public void sendMsg(String msg) throws NamingException {
		String cfJNDI = "jms/ConnectionFactory";// 配置的jndi
		String QUEUE_PHYSICAL_NAME = "jmsQueue";// 配置的PhysicalName
		InitialContext ic = new InitialContext();
		//获取到连接池
		ConnectionFactory connectionFactory = (ConnectionFactory) ic.lookup(cfJNDI);
		Connection connection = null;
		MessageProducer producer = null;
		try {
			//通过连接创建会话
			connection = connectionFactory.createConnection();
			Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
			//创建消息
			TextMessage message = session.createTextMessage();
			message.setText(msg);
			//创建消息队列
			Queue queue = session.createQueue(QUEUE_PHYSICAL_NAME);
			//发送消息
			producer = session.createProducer(queue);
			producer.send(message);
		} catch (JMSException e) {
			e.printStackTrace();
			return;
		} finally {
			// 关闭资源
			if (producer != null) {
				try {
					producer.close();
				} catch (JMSException e) {
					e.printStackTrace();
					return;
				}
			}

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


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