mq消息队列

rabbitmq学习9:使用spring-amqp发送消息及同步接收消息

    通过对spring-amqp看重要类的认识，下面来通过spring-amqp的发送消息及同步接收消息是如何实现的。有兴趣的朋友 可以去spring-amqp官网下载例子。

    先来看看HelloWorldConfiguration类

Java代码  收藏代码
package org.springframework.amqp.helloworld;  

import org.springframework.amqp.core.Queue;
import org.springframework.amqp.rabbit.config.AbstractRabbitConfiguration;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.connection.SingleConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;  

@Configuration
public class HelloWorldConfiguration extends AbstractRabbitConfiguration {  

    protected final String helloWorldQueueName = "hello.world.queue";  

    @Bean
    public ConnectionFactory connectionFactory() {
        SingleConnectionFactory connectionFactory = new SingleConnectionFactory(
                "localhost");
        connectionFactory.setUsername("guest");
        connectionFactory.setPassword("guest");
        return connectionFactory;
    }  

    @Override
    public RabbitTemplate rabbitTemplate() {
        RabbitTemplate template = new RabbitTemplate(connectionFactory());
        // The routing key is set to the name of the queue by the broker for the
        // default exchange.
        template.setRoutingKey(this.helloWorldQueueName);
        // // Where we will synchronously receive messages from
        template.setQueue(this.helloWorldQueueName);
        return template;
    }  

    @Bean
    public Queue helloWorldQueue() {
        return new Queue(this.helloWorldQueueName);
    }
}
 此类定义了ConnectionFactory 、RabbitTemplate 、Queue

发送消息的程序如下：

Java代码  收藏代码
package org.springframework.amqp.helloworld;  

import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;  

public class Producer {  

    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(HelloWorldConfiguration.class);
        AmqpTemplate amqpTemplate = context.getBean(AmqpTemplate.class);
        amqpTemplate.convertAndSend("Hello World");
        System.out.println("Sent: Hello World");
    }  

}
 同步接收消息如下：

Java代码  收藏代码
package org.springframework.amqp.helloworld;  

import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;  

public class Consumer {  

    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(HelloWorldConfiguration.class);
        AmqpTemplate amqpTemplate = context.getBean(AmqpTemplate.class);
        System.out.println("Received: " + amqpTemplate.receiveAndConvert());
    }  

}  

这个例子是Exchange类型为DirectExchange. routingkey的名称默认为Queue的名称。

对于 HelloWorldConfiguration类的配置，也可以通过SPRING XML文件来配置。例如

rabbitConfiguration.xml

Java代码  收藏代码
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">  

    <!-- 创建connectionFactory -->
    <bean id="connectionFactory"
        class="org.springframework.amqp.rabbit.connection.SingleConnectionFactory">
        <constructor-arg value="localhost" />
        <property name="username" value="guest" />
        <property name="password" value="guest" />
    </bean>
    <bean id="rabbitAdmin"
        class="org.springframework.amqp.rabbit.core.RabbitAdmin">
        <constructor-arg ref="connectionFactory" />
    </bean>
    <bean id="rabbitTemplate"
        class="org.springframework.amqp.rabbit.core.RabbitTemplate">
        <constructor-arg ref="connectionFactory"></constructor-arg>
        <property name="queue" value="hello.world.queue"></property>
        <property name="routingKey" value="hello.world.queue"></property>
    </bean>  

    <!-- 声明Queue并设定Queue的名称 -->
    <bean id="helloWorldQueue"
        class="org.springframework.amqp.core.Queue">
        <constructor-arg value="hello.world.queue"></constructor-arg>
    </bean>  

</beans>