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 + "	" + df.format(price) + "	" + df.format(offer) + "	" + (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