Spring+JMS+ActiveMQ+Tomcat实现消息服务

小鱼儿 2022-08-10 12:57 158阅读 0赞

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][http_www.springframework.org_schema_beans]"   
    xmlns:amq="[http://activemq.apache.org/schema/core][http_activemq.apache.org_schema_core]" xmlns:xsi="[http://www.w3.org/2001/XMLSchema-instance][http_www.w3.org_2001_XMLSchema-instance]"   
    xsi:schemaLocation="[http://www.springframework.org/schema/beans][http_www.springframework.org_schema_beans] [ http://www.springframework.org/schema/beans/spring-beans-2.5.xsd][http_www.springframework.org_schema_beans_spring-beans-2.5.xsd]   
        [http://activemq.apache.org/schema/core][http_activemq.apache.org_schema_core] [ http://activemq.apache.org/schema/core/activemq-core.xsd][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：

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][http_java.sun.com_xml_ns_javaee]"   
    xmlns:xsi="[http://www.w3.org/2001/XMLSchema-instance][http_www.w3.org_2001_XMLSchema-instance]"   
    xsi:schemaLocation="[http://java.sun.com/xml/ns/javaee][http_java.sun.com_xml_ns_javaee]    
    [http://java.sun.com/xml/ns/javaee/web-app\_2\_5.xsd][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">   
           
    </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">   
           
    </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。

详细请参考：[http://www.codesky.net/article/201110/173826.html][http_www.codesky.net_article_201110_173826.html]

[http_www.springframework.org_schema_beans]: http://www.springframework.org/schema/beans
[http_activemq.apache.org_schema_core]: http://activemq.apache.org/schema/core
[http_www.w3.org_2001_XMLSchema-instance]: http://www.w3.org/2001/XMLSchema-instance
[http_www.springframework.org_schema_beans_spring-beans-2.5.xsd]: http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
[http_activemq.apache.org_schema_core_activemq-core.xsd]: http://activemq.apache.org/schema/core/activemq-core.xsd
[http_java.sun.com_xml_ns_javaee]: http://java.sun.com/xml/ns/javaee
[http_java.sun.com_xml_ns_javaee_web-app_2_5.xsd]: http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd
[http_www.codesky.net_article_201110_173826.html]: http://www.codesky.net/article/201110/173826.html