小菜鸟学 MQ（三）

创建程序测试MQ

1，创建生产者

package com.robert;
import java.util.Hashtable;
import java.util.Map;  

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MapMessage;
import javax.jms.Message;
import javax.jms.MessageProducer;
import javax.jms.Session;  

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQMapMessage;

public class Publisher {

    protected int MAX_DELTA_PERCENT = 1;
    protected Map<String, Double> LAST_PRICES = new Hashtable<String, Double>();
    protected static int count = 10;
    protected static int total;  

    protected static String brokerURL = "tcp://localhost:61616";
    protected static transient ConnectionFactory factory;
    protected transient Connection connection;
    protected transient Session session;
    protected transient MessageProducer producer;  

    public Publisher() throws JMSException {
        factory = new ActiveMQConnectionFactory(brokerURL);
        connection = factory.createConnection();
        try {
        connection.start();
        } catch (JMSException jmse) {
            connection.close();
            throw jmse;
        }
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        producer = session.createProducer(null);
    }  

    public void close() throws JMSException {
        if (connection != null) {
            connection.close();
        }
    }  

    public static void main(String[] args) throws JMSException {
        Publisher publisher = new Publisher();
        while (total < 1000) {
            for (int i = 0; i < count; i++) {
                publisher.sendMessage(args);
            }
            total += count;
            System.out.println("Published '" + count + "' of '" + total + "' price messages");
            try {
              Thread.sleep(1000);
            } catch (InterruptedException x) {
            }
        }
        publisher.close();
    }  

    protected void sendMessage(String[] stocks) throws JMSException {
        int idx = 0;
        while (true) {
            idx = (int)Math.round(stocks.length * Math.random());
            if (idx < stocks.length) {
                break;
            }
        }
        String stock = stocks[idx];
        Destination destination = session.createTopic("STOCKS." + stock);
        Message message = createStockMessage(stock, session);
        System.out.println("Sending: " + ((ActiveMQMapMessage)message).getContentMap() + " on destination: " + destination);
        producer.send(destination, message);
    }  

    protected Message createStockMessage(String stock, Session session) throws JMSException {
        Double value = LAST_PRICES.get(stock);
        if (value == null) {
            value = new Double(Math.random() * 100);
        }  

        // lets mutate the value by some percentage
        double oldPrice = value.doubleValue();
        value = new Double(mutatePrice(oldPrice));
        LAST_PRICES.put(stock, value);
        double price = value.doubleValue();  

        double offer = price * 1.001;  

        boolean up = (price > oldPrice);  

        MapMessage message = session.createMapMessage();
        message.setString("stock", stock);
        message.setDouble("price", price);
        message.setDouble("offer", offer);
        message.setBoolean("up", up);
        return message;
    }  

    protected double mutatePrice(double price) {
        double percentChange = (2 * Math.random() * MAX_DELTA_PERCENT) - MAX_DELTA_PERCENT;  

        return price * (100 + percentChange) / 100;
    }
}

2,创建消费者

package com.robert;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnectionFactory;

public class Consumer {  

    private static String brokerURL = "tcp://localhost:61616";
    private static transient ConnectionFactory factory;
    private transient Connection connection;
    private transient Session session;  

    public Consumer() throws JMSException {
        factory = new ActiveMQConnectionFactory(brokerURL);
        connection = factory.createConnection();
        connection.start();
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
    }  

    public void close() throws JMSException {
        if (connection != null) {
            connection.close();
        }
    }      

    public static void main(String[] args) throws JMSException {
        Consumer consumer = new Consumer();
        for (String stock : args) {
            Destination destination = consumer.getSession().createTopic("STOCKS." + stock);
            MessageConsumer messageConsumer = consumer.getSession().createConsumer(destination);
            messageConsumer.setMessageListener(new Listener());
        }
    }  

    public Session getSession() {
        return session;
    }
}  

3，创建消息监听

package com.robert;

import java.text.DecimalFormat;

import javax.jms.MapMessage;
import javax.jms.Message;
import javax.jms.MessageListener;

public class Listener implements MessageListener {

    @Override
    public void onMessage(Message message) {
        try {
            MapMessage map = (MapMessage)message;
            String stock = map.getString("stock");
            double price = map.getDouble("price");
            double offer = map.getDouble("offer");
            boolean up = map.getBoolean("up");
            DecimalFormat df = new DecimalFormat( "#,###,###,##0.00" );
            System.out.println(stock + "\t" + df.format(price) + "\t" + df.format(offer) + "\t" + (up?"up":"down"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

a,启动mq服务

b,先启动 消费者程序 Consumer.java

eclipse中添加运行参数如下：

c,启动生产者，发消息。

运行Publisher.java ，添加运行参数如上图所示。

d，登录  http://localhost:8161/admin/topics.jsp

运行如下所示：

转自：http://hi.baidu.com/tuoxinquyu/item/1e9bcfd069641a332a35c73d