如何将消息从Activemq推送到Java应用程序 [英] How can I push messages from Activemq to Java Application

问题描述

嗨开发者，

我想用 JMS编写2 .java 文件库名称是 MessageProducer 和 MessageConsumer 。

我添加了 activemq-all-5.8.0.jar 和 commons-io-2.4.jar 我的 lib 文件夹中的文件。我从 61616 Activemq 的端口号c $ c>到 61617 。

I added activemq-all-5.8.0.jar and commons-io-2.4.jar files in my lib folder.and I changed port number of Activemq from 61616 to 61617.

使用 MessageProducer.java 文件，我将发送消息到 Activemq 。为此，我编写的代码工作正常。如果你想看到点击这个Link 。

using MessageProducer.java file,I will send messages to Activemq.For this I wrote code it's working fine.If you want to see click on this Link.

我想从 Activemq 到 MessageConsumer.java 。这是应用程序在 Apache Tomcat （的http：//本地主机：8080 / ExecutableF ileProcess / MessageConsumer ）

I want to send messages from Activemq to MessageConsumer.java.This is Application is in Apache Tomcat(http://localhost:8080/ExecutableFileProcess/MessageConsumer)

一旦 MessageConsumer 收到消息，它就会将消息分开 - 来自消息的正文，它只是在控制台上打印（仅供我测试）。为此我编写了以下2 java files.But它不起作用。

Once MessageConsumer receives the message, it separates the message-body from message and it just print on console(just for my testing).For this I wrote the following 2 java files.But it's not working.

MessageConsumer.java：

MessageConsumer.java :

 package PackageName;
 import java.io.IOException;
 import javax.jms.Connection;
 import javax.jms.ConnectionFactory;
 import javax.jms.MessageListener;
 import javax.jms.Queue;
 import javax.jms.Session;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import org.apache.activemq.ActiveMQConnectionFactory;
 public class MessageConsumer extends HttpServlet {
@Override
protected void service(HttpServletRequest arg0, HttpServletResponse arg1)
        throws ServletException, IOException {
try {
    //creating connectionfactory object for way
    ConnectionFactory connectionFactory=new ActiveMQConnectionFactory("admin","admin","tcp://localhost:61617");
    //establishing the connection b/w this Application and Activemq
    Connection connection=connectionFactory.createConnection();
    Session session=connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
    Queue queue=session.createQueue("MessageTesing");
    javax.jms.MessageConsumer consumer=session.createConsumer(queue);
    //fetching queues from Activemq
    MessageListener listener = new MyListener();
    consumer.setMessageListener(listener);
    connection.start();
} catch (Exception e) {
    // TODO: handle exception
}

}
}

MyListener.java：

MyListener.java :

package PackageName;
import javax.jms.Message;
import javax.jms.MessageListener;
public class MyListener implements MessageListener {
public void onMessage(Message msg) {
    System.out.println(msg);
}
};

我没有在 Activemq控制台中为队列配置目的地并且在从 MessageProducer.java 发送消息时我也没有提到目的地。

I didn't configure destination for Queue in Activemq console and also I didn't mention "destination" while sending message from MessageProducer.java.

I我正在使用Eclipse。如何在控制台中打印messagebody，实际上基于messagebody我将在我的 MessageConsumer.java 中执行一些操作。但是对于我的测试，我需要看到messagebody。

I am using Eclipse.How can I print messagebody in console,Actually based on messagebody I will do some operations in my MessageConsumer.java.but for my testing I need to see messagebody.

我希望，你明白我在尝试什么。

I hope,you understand what I am trying.

我是的新手JMS 和 Java ，所以你能解释清楚。到目前为止，我用谷歌搜索编写了代码。但我没有找到任何问题。

I am new to JMSand Java,so can you explain clearly.So far I wrote the code using Google search.But I didn't find anywhere this issue.

任何人都可以建议我。

谢谢。

推荐答案

import java.io.Serializable;
import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.ObjectMessage;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.log4j.Logger;

public class ActiveMQConnection {

    private static final long timeout = 3000L;

    private Logger logger = Logger.getLogger(ActiveMQConnection.class);

    private String activeMQUser; 
    private String activeMQPassword;
    private String activeMQURI;
    private String activeMQQueueName;

    private ActiveMQConnectionFactory connectionFactory;
    private Connection connection;
    private Session session;
    private boolean isConnected;

    private boolean transacted = false;
    private Destination destinationQueue;


    private boolean isQueueAvailable;
    private boolean isProducerAvailable;
    private boolean isConsumerAvailable;

    private MessageProducer producerForQueue;
    private MessageConsumer consumerForQueue;

    /**
     * Create Default service
     * @throws Exception 
     */
    public ActiveMQConnection() throws Exception
    {
        try {
                throw new JMSException("No Parameters defined for creating connection. Try constructor with parameters.");
        } catch (JMSException e) {
            logger.error("JMS Exception in Active MQ Connection",e);
            throw e;
        } catch (Exception e) {
            logger.error("JMS Exception in Active MQ Connection",e);
            throw e;
        }
    }


    /**
     * Create a service with desired parameters.
     * @param activeMQUser
     * @param activeMQPassword
     * @param activeMQURI
     * @param activeMQQueueName
     * @throws Exception 
     */
    public ActiveMQConnection(String activeMQUser, String activeMQPassword, String activeMQURI) throws Exception
    {
        try {
            this.activeMQUser = activeMQUser;
            this.activeMQPassword = activeMQPassword;
            this.activeMQURI =  activeMQURI;
            setUpActiveMQConnection();

        } catch (JMSException e) {
            logger.error("JMS Exception in Active MQ Connection",e);
            throw e;
        } catch (Exception e) {
            logger.error("Exception in Active MQ Connection",e);
            throw e;
        }
    }

    /**
     * @throws JMSException, Exception 
     */
    private void setUpActiveMQConnection() throws JMSException, Exception
    {
        connectionFactory = new ActiveMQConnectionFactory(
                this.activeMQUser,
                this.activeMQPassword,
                this.activeMQURI );
        try {
            connection = connectionFactory.createConnection();
            connection.start();
            session = connection.createSession(transacted, Session.AUTO_ACKNOWLEDGE);
            isConnected = true;
        }catch (JMSException e) {
            isConnected = false;
            throw e;
        }catch(Exception e){
            isConnected = false;
            throw e;
        }
    }

    /**
     * @throws Exception
     */
    public void setUpQueue(String queueName ) throws Exception
    {
        this.activeMQQueueName = queueName;
        createQueue();
        createProducer();
        createConsumer();
    }

    /**
     * @throws Exception
     */
    private void createQueue() throws Exception 
    {
        try {
            if(destinationQueue == null)
                {   
                destinationQueue = session.createQueue(this.activeMQQueueName);
                isQueueAvailable = true;
                }
        } catch (JMSException e) {
            isQueueAvailable = false;
            throw e;
        }catch(Exception e){
            isQueueAvailable = false;
            throw e;
        }
    }

    /**
     * @throws JMSException 
     * 
     */
    private void createProducer() throws JMSException
    {   
        if(producerForQueue == null)
        {   
            try {
                producerForQueue = session.createProducer(destinationQueue);
                producerForQueue.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
                isProducerAvailable = true;
            } catch (JMSException e) {
                isProducerAvailable = false;
                throw e;
            }
        }
    }

    /**
     * @throws JMSException
     */
    private void createConsumer() throws JMSException
    {   
        if(consumerForQueue == null)
        {   
            try {
                consumerForQueue = session.createConsumer(destinationQueue);
                isConsumerAvailable = true;
            } catch (JMSException e) {
                isConsumerAvailable = false;
                throw e;
            }
        }
    }

    /**
     * @param objectToQueue
     * @throws JMSException
     */
    public void sendMessage(Serializable objectToQueue) throws JMSException 
    {
        ObjectMessage message = session.createObjectMessage();
        message.setObject(objectToQueue);
        producerForQueue.send(message);
    }

    /**
     * @param objectToQueue
     * @throws JMSException
     */
    public Serializable receiveMessage() throws JMSException 
    {
        Message message = consumerForQueue.receive(timeout);
        if (message instanceof ObjectMessage) 
              { 
                  ObjectMessage objMsg = (ObjectMessage) message;
                  Serializable sobject = objMsg.getObject();
                  return sobject;
              }
        return null;
    }

    /**
     * close-MQ-Connection
     */
    public void closeMQConnection()
    {
        try 
        {
            if(consumerForQueue != null)
            {
            consumerForQueue.close();
            }
            if(producerForQueue != null)
            {
            producerForQueue.close();
            }
            if(session != null)
            {
            session.close();
            }
            if(connection != null )
            {
            connection.close();
            }   
        } 
        catch (JMSException e) 
            {
            logger.info("Error while closing connection.",e);
            }
        finally
            {
            consumerForQueue = null;
            producerForQueue = null;
            destinationQueue = null;
            session = null;
            connection = null;
            activeMQUser = null;
            activeMQPassword = null;
            activeMQQueueName = null;
            activeMQURI = null;
            }
    }

    public boolean isConnected() {
        return isConnected;
    }

    public void setConnected(boolean isConnected) {
        this.isConnected = isConnected;
    }

    public boolean isQueueAvailable() {
        return isQueueAvailable;
    }

    public void setQueueAvailable(boolean isQueueAvailable) {
        this.isQueueAvailable = isQueueAvailable;
    }

    public boolean isProducerAvailable() {
        return isProducerAvailable;
    }

    public void setProducerAvailable(boolean isProducerAvailable) {
        this.isProducerAvailable = isProducerAvailable;
    }

    public MessageConsumer getConsumerForQueue() {
        return consumerForQueue;
    }

    public void setConsumerForQueue(MessageConsumer consumerForQueue) {
        this.consumerForQueue = consumerForQueue;
    }

    public boolean isConsumerAvailable() {
        return isConsumerAvailable;
    }

    public void setConsumerAvailable(boolean isConsumerAvailable) {
        this.isConsumerAvailable = isConsumerAvailable;
    }
}

以上是

• 创建连接 创建/连接到队列 发送消息 接收消息


• 您可以使用其中的方法发送或收到任何Serializable POJO。

• creating connection creating/connecting to queue sending message receiving message
• You can use methods in it to send or receive any Serializable POJO.

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