使用Spring JMS简化异步消息处理

王朝java/jsp·作者佚名  2006-03-08
窄屏简体版  字體: |||超大  

http://www.onjava.com/lpt/a/6490

这片文章介绍了Spring是如何简化异步消息调用的,它通过一个贷款的例子来说Spring是如何减少

开发中的量的。

下面是传统开发需要的代码量

public void sendMessage() {

queueName = "queue/CreditRequestSendQueue";

System.out.println("Queue name is " + queueName);

/*

* Create JNDI Initial Context

*/

try {

Hashtable env = new Hashtable();

env.put("java.naming.factory.initial",

"org.jnp.interfaces.NamingContextFactory");

env.put("java.naming.provider.url","localhost");

env.put("java.naming.factory.url.pkgs",

"org.jnp.interfaces:org.jboss.naming");

jndiContext = new InitialContext(env);

} catch (NamingException e) {

System.out.println("Could not create JNDI API " +

"context: " + e.toString());

}

/*

* Get queue connection factory and queue objects from JNDI context.

*/

try {

queueConnectionFactory = (QueueConnectionFactory)

jndiContext.lookup("UIL2ConnectionFactory");

queue = (Queue) jndiContext.lookup(queueName);

} catch (NamingException e) {

System.out.println("JNDI API lookup failed: " +

e.toString());

}

/*

* Create connection, session, sender objects.

* Send the message.

* Cleanup JMS connection.

*/

try {

queueConnection =

queueConnectionFactory.createQueueConnection();

queueSession = queueConnection.createQueueSession(false,

Session.AUTO_ACKNOWLEDGE);

queueSender = queueSession.createSender(queue);

message = queueSession.createTextMessage();

message.setText("This is a sample JMS message.");

System.out.println("Sending message: " + message.getText());

queueSender.send(message);

} catch (JMSException e) {

System.out.println("Exception occurred: " + e.toString());

} finally {

if (queueConnection != null) {

try {

queueConnection.close();

} catch (JMSException e) {}

}

}

}

然后是Spring的代码

public void send() {

try {

ClassPathXmlApplicationContext appContext = new

ClassPathXmlApplicationContext(new String[] {

"spring-jms.xml"});

System.out.println("Classpath loaded");

JMSSender jmsSender = (JMSSender)appContext.getBean("jmsSender");

jmsSender.sendMesage();

System.out.println("Message sent using Spring JMS.");

} catch(Exception e) {

e.printStackTrace();

}

}

表面上看Spring获胜,代码少了很多,但是我们再来看看Spring配置的XML

<bean id="jndiTemplate" class="org.springframework.jndi.JndiTemplate">

<property name="environment">

<props>

<prop key="java.naming.factory.initial">

org.jnp.interfaces.NamingContextFactory

</prop>

<prop key="java.naming.provider.url">

localhost

</prop>

<prop key="java.naming.factory.url.pkgs">

org.jnp.interfaces:org.jboss.naming

</prop>

</props>

</property>

</bean>

<bean id="jmsQueueConnectionFactory"

class="org.springframework.jndi.JndiObjectFactoryBean">

<property name="jndiTemplate">

<ref bean="jndiTemplate"/>

</property>

<property name="jndiName">

<value>UIL2ConnectionFactory</value>

</property>

</bean>

<bean id="sendDestination"

class="org.springframework.jndi.JndiObjectFactoryBean">

<property name="jndiTemplate">

<ref bean="jndiTemplate"/>

</property>

<property name="jndiName">

<value>queue/CreditRequestSendQueue</value>

</property>

</bean>

<bean id="receiveDestination"

class="org.springframework.jndi.JndiObjectFactoryBean">

<property name="jndiTemplate">

<ref bean="jndiTemplate"/>

</property>

<property name="jndiName">

<value>queue/CreditReqeustReceiveQueue</value>

</property>

</bean>

<bean id="jmsTemplate"

class="org.springframework.jms.core.JmsTemplate102">

<property name="connectionFactory">

<ref bean="jmsQueueConnectionFactory"/>

</property>

<property name="defaultDestination">

<ref bean="destination"/>

</property>

<property name="receiveTimeout">

<value>30000</value>

</property>

</bean>

<bean id="jmsSender" class="springexample.client.JMSSender">

<property name="jmsTemplate">

<ref bean="jmsTemplate"/>

</property>

</bean>

<bean id="jmsReceiver" class="springexample.client.JMSReceiver">

<property name="jmsTemplate">

<ref bean="jmsTemplate"/>

</property>

</bean>

我们开始认清Spring的真面目把。无厘头的配置,XML的梦魇。从一种混乱到另一种还乱。

 
 
 
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