ActiveMQ 生产者和消费者demo
http://www.cnblogs.com/hoojo/p/active_mq_jms_apache_activeMQ.html，这个写的不错。
生产者代码
package org.mule.util.ansyLog;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.ExceptionListener;
import javax.jms.JMSException;
import javax.jms.MapMessage;
import javax.jms.Message;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.ActiveMQSession;
import org.apache.activemq.pool.PooledConnectionFactory;
/**
* JMS消息生产者
* @author
*
*/
public class JMSProducer implements ExceptionListener{
//设置连接的最大连接数
public final static int DEFAULT_MAX_CONNECTIONS=5;
private int maxConnections = DEFAULT_MAX_CONNECTIONS;
//设置每个连接中使用的最大活动会话数
private int maximumActiveSessionPerConnection = DEFAULT_MAXIMUM_ACTIVE_SESSION_PER_CONNECTION;
public final static int DEFAULT_MAXIMUM_ACTIVE_SESSION_PER_CONNECTION=300;
//线程池数量
private int threadPoolSize = DEFAULT_THREAD_POOL_SIZE;
public final static int DEFAULT_THREAD_POOL_SIZE=50;
//强制使用同步返回数据的格式
private boolean useAsyncSendForJMS = DEFAULT_USE_ASYNC_SEND_FOR_JMS;
public final static boolean DEFAULT_USE_ASYNC_SEND_FOR_JMS=true;
//是否持久化消息
private boolean isPersistent = DEFAULT_IS_PERSISTENT;
public final static boolean DEFAULT_IS_PERSISTENT=true;
//连接地址
private String brokerUrl;
private String userName;
private String password;
private ExecutorService threadPool;
private PooledConnectionFactory connectionFactory;
public JMSProducer(String brokerUrl, String userName, String password) {
this(brokerUrl, userName, password, DEFAULT_MAX_CONNECTIONS, DEFAULT_MAXIMUM_ACTIVE_SESSION_PER_CONNECTION, DEFAULT_THREAD_POOL_SIZE, DEFAULT_USE_ASYNC_SEND_FOR_JMS, DEFAULT_IS_PERSISTENT);
}
public JMSProducer(String brokerUrl, String userName, String password, int maxConnections, int maximumActiveSessionPerConnection, int threadPoolSize,boolean useAsyncSendForJMS, boolean isPersistent) {
this.useAsyncSendForJMS = useAsyncSendForJMS;
this.isPersistent = isPersistent;
this.brokerUrl = brokerUrl;
this.userName = userName;
this.password = password;
this.maxConnections = maxConnections;
this.maximumActiveSessionPerConnection = maximumActiveSessionPerConnection;
this.threadPoolSize = threadPoolSize;
init();
}
private void init() {
//设置JAVA线程池
this.threadPool = Executors.newFixedThreadPool(this.threadPoolSize);
//ActiveMQ的连接工厂
ActiveMQConnectionFactory actualConnectionFactory = new ActiveMQConnectionFactory(this.userName, this.password, this.brokerUrl);
actualConnectionFactory.setUseAsyncSend(this.useAsyncSendForJMS);
//Active中的连接池工厂
this.connectionFactory = new PooledConnectionFactory(actualConnectionFactory);
this.connectionFactory.setCreateConnectionOnStartup(true);
this.connectionFactory.setMaxConnections(this.maxConnections);
this.connectionFactory.setMaximumActiveSessionPerConnection(this.maximumActiveSessionPerConnection);
}
/**
* 执行发送消息的具体方法
* @param queue
* @param map
*/
public void send(final String queue, final Map map) {
//直接使用线程池来执行具体的调用
this.threadPool.execute(new Runnable(){
@Override
public void run() {
try {
sendMsg(queue,map);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* 执行发送消息的具体方法
* @param queue
* @param map
*/
public void send(final String queue, final String message) {
//直接使用线程池来执行具体的调用
this.threadPool.execute(new Runnable(){
@Override
public void run() {
try {
sendMsg(queue,message);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* 真正的执行消息发送
* @param queue
* @param map
* @throws Exception
*/
private void sendMsg(String queue, String msg) throws Exception {
Connection connection = null;
Session session = null;
try {
//从连接池工厂中获取一个连接
connection = this.connectionFactory.createConnection();
/*createSession(boolean transacted,int acknowledgeMode)
transacted - indicates whether the session is transacted acknowledgeMode - indicates whether the consumer or the client
will acknowledge any messages it receives; ignored if the session is transacted.
Legal values are Session.AUTO_ACKNOWLEDGE, Session.CLIENT_ACKNOWLEDGE, and Session.DUPS_OK_ACKNOWLEDGE.
*/
//false 参数表示 为非事务型消息，后面的参数表示消息的确认类型
// session = connection.createSession(Boolean.FALSE, Session.AUTO_ACKNOWLEDGE);
session = connection.createSession(Boolean.TRUE, ActiveMQSession.INDIVIDUAL_ACKNOWLEDGE);
//true 开启事务，需要客户端确认
// session = connection.createSession(Boolean.TRUE, Session.CLIENT_ACKNOWLEDGE);
//Destination is superinterface of Queue
//PTP消息方式
Destination destination = session.createQueue(queue);
//Creates a MessageProducer to send messages to the specified destination
MessageProducer producer = session.createProducer(destination);
//set delevery mode
producer.setDeliveryMode(this.isPersistent ? DeliveryMode.PERSISTENT : DeliveryMode.NON_PERSISTENT);
//map convert to javax message
TextMessage message = session.createTextMessage(msg);
producer.send(message);
session.commit();
} finally {
closeSession(session);
closeConnection(connection);
}
}
/**
* 真正的执行消息发送
* @param queue
* @param map
* @throws Exception
*/
private void sendMsg(String queue, Map map) throws Exception {
Connection connection = null;
Session session = null;
try {
//从连接池工厂中获取一个连接
connection = this.connectionFactory.createConnection();
//false 参数表示 为非事务型消息，后面的参数表示消息的确认类型
session = connection.createSession(Boolean.FALSE, Session.AUTO_ACKNOWLEDGE);
//PTP消息方式
Destination destination = session.createQueue(queue);
//Creates a MessageProducer to send messages to the specified destination
MessageProducer producer = session.createProducer(destination);
//set delevery mode
producer.setDeliveryMode(this.isPersistent ? DeliveryMode.PERSISTENT : DeliveryMode.NON_PERSISTENT);
//map convert to javax message
Message message = getMessage(session, map);
producer.send(message);
} finally {
closeSession(session);
closeConnection(connection);
}
}
private Message getMessage(Session session, Map map) throws JMSException {
MapMessage message = session.createMapMessage();
if (map != null && !map.isEmpty()) {
Set keys = map.keySet();
for (String key : keys) {
message.setObject(key, map.get(key));
}
}
return message;
}
private void closeSession(Session session) {
try {
if (session != null) {
session.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
private void closeConnection(Connection connection) {
try {
if (connection != null) {
connection.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onException(JMSException e) {
e.printStackTrace();
}
}
// ConnectionFactory ：连接工厂，JMS 用它创建连接
ConnectionFactory connectionFactory;
// Connection ：JMS 客户端到JMS Provider 的连接
// Connection connection = null;
// Session： 一个发送或接收消息的线程
Session session;
// Destination ：消息的目的地;消息发送给谁.
Destination destination;
// 消费者，消息接收者
MessageConsumer consumer = null;
connectionFactory = new ActiveMQConnectionFactory(
USERNAME,PASSWORD,ACTIVE_URL);
try {
// 构造从工厂得到连接对象
connection = connectionFactory.createConnection();
// 启动
connection.start();
// 获取操作连接
session = connection.createSession(Boolean.FALSE,
Session.AUTO_ACKNOWLEDGE);
// 获取session注意参数值xingbo.xu-queue是一个服务器的queue，须在在ActiveMq的console配置
destination = session.createQueue(QUEUE_NAME_LOG);
consumer = session.createConsumer(destination);
while (true) {
TextMessage message = (TextMessage) consumer.receive();
if (null != message) {
System.out.println("--------------------"+message.getText());
JSONObject json = (JSONObject) JSON.parse(message.getText());
//保存到数据库
System.out.println(json.getString("inPro"));
message.acknowledge();
} else {
break;
}
}
} catch (Exception e) {
e.printStackTrace();
} 这里是基于queue的，支持事务，并且持久化的。
JMS消息确认机制
JMS消息只有在被确认之后，才认为已经被成功地消费了。消息的成功消费通常包含三个阶段：客户接收消息、客户处理消息和消息被确认。在事务性会话中，当一个事务被提交的时候，确认自动发生。在非事务性会话中，消息何时被确认取决于创建会话时的应答模式（acknowledgement mode）。该参数有以下三个可选值：
Session.AUTO_ACKNOWLEDGE。当客户成功的从receive方法返回的时候，或者从MessageListener.onMessage方法成功返回的时候，会话自动确认客户收到的消息。
Session.CLIENT_ACKNOWLEDGE。 客户通过消息的acknowledge方法确认消息。需要注意的是，在这种模式中，确认是在会话层上进行：确认一个被消费的消息将自动确认所有已被会话消 费的消息。例如，如果一个消息消费者消费了10个消息，然后确认第5个消息，那么所有10个消息都被确认。
Session.DUPS_ACKNOWLEDGE。 该选择只是会话迟钝第确认消息的提交。如果JMS provider失败，那么可能会导致一些重复的消息。如果是重复的消息，那么JMS provider必须把消息头的JMSRedelivered字段设置为true。
ActiveMQ消息确认机制
ActiveMQSession，实现了JMS的session，QueueSession, TopicSession
ActiveMQSession.INDIVIDUAL_ACKNOWLEDGE 每条消息都必须显式调用acknowledge方法确认消息。
JMS 支持以下两种消息提交模式：
DeliveryMode.PERSISTENT 指示JMS provider持久保存消息，以保证消息不会因为JMS provider的失败而丢失。 消息持久化在硬盘中，ActiveMQ持久化有三种方式：AMQ、KahaDB、JDBC。
DeliveryMode.NON_PERSISTENT 不要求JMS provider持久保存消息，消息存放在内存中，读写速度快，在JMS服务停止后消息会消失，没有持久化到硬盘。