Apache activemq例子
Apache activemq 是目前比较流行的开源消息，支持多语言客户的编写， 支持Ajax、支持与Axis的整合完全支持JMS1.1和J2EE 1.4规范。 官网： http://activemq.apache.org/最新版本下载http://activemq.apache.org/download.html.
所用的Jar包:
activemq-core-5.1.0.jar、geronimo-j2ee-management_1.0_spec-1.0.jar、geronimo-jms_1.1_spec-1.1.1.jar、geronimo-jta_1.0.1B_spec-1.0.1.jar、activemq-web-5.1.0.jar
首先启动activemq.bat服务
activemq.xml配置：
Tomcat下的Content.xml文件配置：
web.xml的配置：
jms-listener
com.util.jms.JMSListener
1
brokerURI
/WEB-INF/activemq.xml
JMSListener监听类和接受消息处理：
package com.util.jms;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.Topic;
import javax.jms.TopicSubscriber;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
/**
* JMS监听端
* 由容器加载
* Servlet模式
*
* @author Iverson
*/
public class JMSListener extends HttpServlet implements MessageListener {
private static final long serialVersionUID = 1L;
public static StringBuffer newsContent = new StringBuffer();
/** 初始化jms连接，创建topic监听器 */
public void init(ServletConfig config) throws ServletException {
try {
// 初始上下文
InitialContext initCtx = new InitialContext();
// 上下文查找
Context envContext = (Context) initCtx.lookup("java:comp/env");
ConnectionFactory connectionFactory = (ConnectionFactory) envContext.lookup("jms/FailoverConnectionFactory");
Connection connection = connectionFactory.createConnection();
// Connection必须指定一个唯一的clientId
connection.setClientID("clientId");
Session jmsSession = connection.createSession(false,Session.AUTO_ACKNOWLEDGE);
// //基于Topic创建持久的消息订阅者
TopicSubscriber consumer = jmsSession.createDurableSubscriber((Topic) envContext.lookup("jms/topic/MyTopic"), "MySub");
consumer.setMessageListener(this);
connection.start();
} catch (NamingException e) {
e.printStackTrace(System.out);
} catch (JMSException e) {
e.printStackTrace(System.out);
}
}
@Override
// 消息处理
public void onMessage(Message message) {
String content = "";
// 如果是修改员工
if (checkText(message, JMSLogotype.EMPUP) != null) {
content = checkText(message, JMSLogotype.EMPUP);
System.out.println(content);
}
}
// 接受消息JSP处理
private static String checkText(Message m, String s) {
try {
return m.getStringProperty(s);
} catch (JMSException e) {
e.printStackTrace(System.out);
return null;
}
}
Publish消息发布类：
package com.util.jms;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
/**
*biz 消息发布
*
* @author allen
*/
public class BizPublish extends HttpServlet implements MessageListener {
private static final long serialVersionUID = 1L;
private InitialContext initCtx;
private Context envContext;
private ConnectionFactory connectionFactory;
private Connection connection;
private Session jmsSession;
private MessageProducer producer;
/**
* Singleton
*/
static class BizPublishHolder {
static BizPublish instance = new BizPublish();
}
public static BizPublish getInstance() {
return BizPublishHolder.instance;
}
private BizPublish() {
super();
try {
init();
} catch (ServletException e) {
e.printStackTrace();
}
}
/**
* Initialization of the servlet.
*/
public void init() throws ServletException {
try {
initCtx = new InitialContext();
envContext = (Context) initCtx.lookup("java:comp/env");
connectionFactory = (ConnectionFactory) envContext.lookup("jms/NormalConnectionFactory");
connection = connectionFactory.createConnection();
jmsSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
producer = jmsSession.createProducer((Destination) envContext.lookup("jms/topic/MyTopic"));
} catch (NamingException e) {
e.printStackTrace();
} catch (JMSException e) {
e.printStackTrace();
}
}
@Override
public void onMessage(Message message) {
}
public void send(String content) {
// 设置持久方式
try {
producer.setDeliveryMode(DeliveryMode.PERSISTENT);
Message testMessage = jmsSession.createMessage();
// 发布消息
testMessage.setStringProperty("faceemployye", content);
producer.send(testMessage);
// testMessage.clearProperties();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Destruction of the servlet.
*/
public void destroy() {
super.destroy();
}
}
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