Spring+JMS+ActiveMQ+Tomcat实现消息服务

基于Spring+JMS+ActiveMQ+Tomcat，我使用的版本情况如下所示：

Spring 2.5
ActiveMQ 5.4.0
Tomcat 6.0.30
下面通过学习与配置，实现消息服务的基本功能：发送与接收。Spring对JMS提供了很好的支持，可以通过JmsTemplate来方便地实现消息服务。这里，我们的消息服务不涉及事务管理。下面简单说明实现过程：

先看一下，我们最终的Spring配置文件applicationContext.xml的内容，如下所示：

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:amq="http://activemq.apache.org/schema/core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 
        http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd"> 
 
    <bean id="listenerContainer" 
        class="org.springframework.jms.listener.DefaultMessageListenerContainer"> 
        <property name="connectionFactory" ref="connectionFactory"></property> 
        <property name="destination" ref="messageQueue"></property> 
        <property name="messageListener" ref="receiveMessageListener"></property> 
    </bean> 
    <bean id="connectionFactory" class="org.springframework.jndi.JndiObjectFactoryBean"> 
        <property name="jndiName" value="java:comp/env/myJMS/ConnectionFactory"></property> 
    </bean> 
    <bean id="messageQueue" class="org.springframework.jndi.JndiObjectFactoryBean"> 
        <property name="jndiName" value="java:comp/env/myJMS/MessageQueue"></property> 
    </bean> 
    <bean id="receiveMessageListener" 
        class="org.shirdrn.spring.jms.integration.ReceiveMessageListener"></bean> 
 
    <bean id="messageSender" class="org.shirdrn.spring.jms.integration.MessageSender"> 
        <property name="jmsTemplate" ref="jmsTemplate"></property> 
    </bean> 
    <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate"> 
        <property name="connectionFactory" ref="connectionFactory"></property> 
        <property name="defaultDestination" ref="messageQueue"></property> 
    </bean> 
 
    <bean id="sendMessageController" 
        class="org.shirdrn.spring.jms.integration.SendMessageController"> 
        <property name="messageSender" ref="messageSender" /> 
        <property name="successView" value="/success" /> 
    </bean> 
    <bean id="urlMapping" 
        class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> 
        <property name="mappings"> 
            <props> 
                <prop key="/sendMessage.do">sendMessageController</prop> 
            </props> 
        </property> 
    </bean> 
    <bean id="viewResolver" 
        class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
        <property name="requestContextAttribute" value="rc" /> 
        <property name="viewClass" 
            value="org.springframework.web.servlet.view.JstlView" /> 
        <property name="prefix" value="/" /> 
        <property name="suffix" value=".jsp" /> 
    </bean> 
     
</beans> 
我们使用Spring的org.springframework.jms.listener.DefaultMessageListenerContainer来收集消息，通过设置一个消息监听器，具体实现类为org.shirdrn.spring.jms.integration.ReceiveMessageListener，代码如下所示：

package org.shirdrn.spring.jms.integration; 
 
import javax.jms.JMSException; 
import javax.jms.Message; 
import javax.jms.MessageListener; 
import javax.jms.TextMessage; 
 
import org.apache.log4j.Logger; 
 
public class ReceiveMessageListener implements MessageListener { 
 
    private static final Logger LOG = Logger.getLogger(ReceiveMessageListener.class); 
     
    public void onMessage(Message message) { 
        if (message instanceof TextMessage) { 
            TextMessage text = (TextMessage) message; 
            try { 
                LOG.info("Received message:" + text.getText()); 
            } catch (JMSException e) { 
                e.printStackTrace(); 
            } 
        } 
    } 
 
} 
上面，对发送的消息进行监听，并接收处理，我们只是简单地打印出一条日志内容。

对于listenerContainer，还需要注入连接工厂connectionFactory和消息目的destination这两个属性：connectionFactory我们使用ActiveMQ的org.apache.activemq.ActiveMQConnectionFactory，并通过JNDI服务，绑定到名字java:comp/env/myJMS/ConnectionFactory上；而destination属性通过使用ActiveMQ的org.apache.activemq.command.ActiveMQQueue消息队列，也是通过JNDI服务绑定到名字java:comp/env/myJMS/MessageQueue上。所以，在Tomcat的conf/context.xml中的<Context>元素里面加上如下配置：

<Resource name="myJMS/ConnectionFactory"  
    auth="Container"    
    type="org.apache.activemq.ActiveMQConnectionFactory"  
    description="JMS Connection Factory" 
    factory="org.apache.activemq.jndi.JNDIReferenceFactory"  
    brokerURL="vm://shirdrnUrl"  
    brokerName="MyActiveMQBroker"/> 
 
<Resource name="myJMS/MessageQueue"  
    auth="Container"  
    type="org.apache.activemq.command.ActiveMQQueue" 
    description="My Message Queue" 
    factory="org.apache.activemq.jndi.JNDIReferenceFactory"  
    physicalName="MyMessageQueue"/> 
我们通过使用JmsTemplate来实现消息的发送，所以实现的发送类要将JmsTemplate注入进去，实现代码如下所示：

package org.shirdrn.spring.jms.integration; 
 
import javax.jms.JMSException; 
import javax.jms.Message; 
import javax.jms.Session; 
import javax.jms.TextMessage; 
 
import org.apache.log4j.Logger; 
import org.springframework.jms.core.JmsTemplate; 
import org.springframework.jms.core.MessageCreator; 
 
public class MessageSender { 
     
    private static final Logger LOG = Logger.getLogger(MessageSender.class); 
    private JmsTemplate jmsTemplate; 
 
    public void setJmsTemplate(JmsTemplate jmsTemplate) { 
        this.jmsTemplate = jmsTemplate; 
    } 
     
    public void sendMessage(final String message) { 
        LOG.info("Send message: " + message); 
        jmsTemplate.send(new MessageCreator() { 
 
            public Message createMessage(Session session) throws JMSException { 
                TextMessage textMessage = session.createTextMessage(message); 
                return textMessage; 
            } 
             
        }); 
    } 
 
} 
上面基于Spring的MessageCreator来创建消息，通过调用JmsTemplate的send方法发送出去。

对于Web，我们使用了Spring MVC，通过实现一个控制器org.shirdrn.spring.jms.integration.SendMessageController来控制页面消息的发送及其视图的派发。我们实现的SendMessageController类继承自MultiActionController，可以在一个控制器中实现多个Action，代码实现如下所示：

package org.shirdrn.spring.jms.integration; 
 
import java.util.HashMap; 
import java.util.Map; 
 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
 
import org.springframework.web.servlet.ModelAndView; 
import org.springframework.web.servlet.mvc.multiaction.MultiActionController; 
 
public class SendMessageController extends MultiActionController { 
 
    private String successView; 
    private MessageSender messageSender; 
 
    public ModelAndView sendMessage(HttpServletRequest request, 
            HttpServletResponse response) throws Exception { 
         
        Map<String, Object> retMap = new HashMap<String, Object>(); 
        String message = request.getParameter("message"); 
        messageSender.sendMessage(message); 
         
        return new ModelAndView(successView, retMap); 
    } 
 
    public String getSuccessView() { 
        return successView; 
    } 
 
    public void setSuccessView(String successView) { 
        this.successView = successView; 
    } 
 
    public MessageSender getMessageSender() { 
        return messageSender; 
    } 
 
    public void setMessageSender(MessageSender messageSender) { 
        this.messageSender = messageSender; 
    } 
 
} 
上面调用模型层（Model）的MessageSender来实现发送消息的处理逻辑，如果发送成功，视图派发到successView指定的页面。可以看到，最前面我们给出的Spring配置内容分为三组，最后一组是对控制器的配置：

viewResolver                     视图解析器配置，可以将控制器中指定前缀（/）解析为后缀是.jsp的页面，例如/success解析为/sucess.jsp

urlMapping                         请求URL与控制器的映射，例如对于满足/sendMessage.do模式的请求，都会被指派给sendMessageController去处理

sendMessageController      控制器实现类，里面的方法名称可以自定义，但要在org.springframework.web.servlet.handler.SimpleUrlHandlerMapping中的mappings属性中配置映射

然后，我们需要一个web部署描述文件，web.xml文件配置内容，如下所示：

<?xml version="1.0" encoding="UTF-8"?> 
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" 
    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/web-app_2_5.xsd"> 
 
    <context-param> 
        <param-name>contextConfigLocation</param-name> 
        <param-value> 
            classpath:org/shirdrn/spring/jms/integration/applicationContext.xml 
        </param-value> 
    </context-param> 
    <listener> 
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
    </listener> 
 
    <servlet> 
        <servlet-name>controller</servlet-name> 
        <servlet-class> 
            org.springframework.web.servlet.DispatcherServlet 
        </servlet-class> 
        <init-param> 
            <param-name>contextConfigLocation</param-name> 
            <param-value> 
                classpath:org/shirdrn/spring/jms/integration/applicationContext.xml 
            </param-value> 
        </init-param> 
        <load-on-startup>1</load-on-startup> 
    </servlet> 
 
    <servlet-mapping> 
        <servlet-name>controller</servlet-name> 
        <url-pattern>*.do</url-pattern> 
    </servlet-mapping> 
   
     
    <welcome-file-list> 
        <welcome-file>index.jsp</welcome-file> 
    </welcome-file-list> 
</web-app> 
另外，我们还要实现一个页面，提供输入发送消息的表单，提交后交给后台处理，成功发送后跳转到一个成功页面。表单输入页面为index.jsp，如下所示：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 
<% 
    String path = request.getContextPath(); 
    String basePath = request.getScheme() + "://" 
            + request.getServerName() + ":" + request.getServerPort() 
            + path + "/"; 
%> 
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html> 
    <head> 
        <base href=../../"<%=basePath%>"> 
 
        <title>My JSP 'index.jsp' starting page</title> 
        <meta http-equiv="pragma" content="no-cache"> 
        <meta http-equiv="cache-control" content="no-cache"> 
        <meta http-equiv="expires" content="0"> 
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 
        <meta http-equiv="description" content="This is my page"> 
        <!-- 
    <link rel="stylesheet" type="text/css" href=../../"styles.css" mce_href=../../"styles.css"> 
    --> 
    </head> 
 
    <body> 
        <div align="center" style="width: 500px; height: 300px; border:2px; borderColor:black"> 
            <form action="sendMessage.do" method="post"> 
                <table align="center"> 
                    <tr> 
                        <th colspan="2"> 
                            消息发送控制台 
                        </th> 
                    </tr> 
                    <tr> 
                        <td> 
                            消息内容： 
                        </td> 
                        <td> 
                            <input type="text" name="message"> 
                        </td> 
                    </tr> 
                    <tr> 
                        <td align="center" colspan="2"> 
                            <input type="reset" value="清除"> 
                                 
                            <input type="submit" value="发送"> 
                        </td> 
                    </tr> 
                </table> 
            </form> 
        </div> 
    </body> 
</html> 
成功页面为success.jsp，就是给一个成功的提示信息，如下所示：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 
<% 
    String path = request.getContextPath(); 
    String basePath = request.getScheme() + "://" 
            + request.getServerName() + ":" + request.getServerPort() 
            + path + "/"; 
%> 
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html> 
    <head> 
        <base href=../../"<%=basePath%>"> 
 
        <title>My JSP 'index.jsp' starting page</title> 
        <meta http-equiv="pragma" content="no-cache"> 
        <meta http-equiv="cache-control" content="no-cache"> 
        <meta http-equiv="expires" content="0"> 
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 
        <meta http-equiv="description" content="This is my page"> 
        <!-- 
    <link rel="stylesheet" type="text/css" href=../../"styles.css" mce_href=../../"styles.css"> 
    --> 
    </head> 
 
    <body> 
        <div align="center" style="width: 500px; height: 300px; border:2px; borderColor:black"> 
            <form action="sendMessage.do" method="post"> 
                <table align="center"> 
                    <tr> 
                        <th colspan="2"> 
                            消息发送报告 
                        </th> 
                    </tr> 
                    <tr> 
                        <td colspan="2"> 
                            状态：发送成功 
                        </td> 
                    </tr> 
                    <tr> 
                        <td align="center" colspan="2"> 
                            <a href=../../"index.jsp" mce_href=../../"index.jsp">返回</a> 
                        </td> 
                    </tr> 
                </table> 
            </form> 
        </div> 
    </body> 
</html> 
至此，我们可以将实现的简单web工程发布到Tomcat容器，然后启动Tomcat服务器，通过页面可以发送消息，并通过日志查看，实际消息发送和接收的情况