rabbitMQ教程（四） spring整合rabbitMQ代码实例

一、开启rabbitMQ服务，导入MQ jar包和gson jar包(MQ默认的是jackson，但是效率不如Gson，所以我们用gson)

二、发送端配置，在spring配置文件中配置

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

 <!-- 连接服务配置 如果MQ服务器在远程服务器上，请新建用户用新建的用户名密码  guest默认不允许远程登录-->
    <rabbit:connection-factory id="connectionFactory"
        host="localhost" username="guest" password="guest" port="5672"
        virtual-host="/" channel-cache-size="5" />
  <!-- 配置爱admin，自动根据配置文件生成交换器和队列，无需手动配置 -->
    <rabbit:admin connection-factory="connectionFactory" />  

    <!-- queue 队列声明 -->
    <rabbit:queue  durable="true"
        auto-delete="false" exclusive="false" name="spring.queue.tag" />  

    <!-- exchange queue binging key 绑定 -->
    <rabbit:direct-exchange name="spring.queue.exchange"
        durable="true" auto-delete="false">
        <rabbit:bindings>
            <rabbit:binding queue="spring.queue.tag" key="spring.queue.tag.key" />
        </rabbit:bindings>
    </rabbit:direct-exchange>  

    <!-- spring amqp默认的是jackson 的一个插件,目的将生产者生产的数据转换为json存入消息队列，由于Gson的速度快于jackson,这里替换为Gson的一个实现 -->
    <bean id="jsonMessageConverter"    class="sendMQ.Gson2JsonMessageConverter" />  

    <!-- spring template声明 -->
    <rabbit:template id="amqpTemplate" exchange="spring.queue.exchange"  routing-key="spring.queue.tag.key"
        connection-factory="connectionFactory" message-converter="jsonMessageConverter" /> 

发送端代码：GSON配置

package sendMQ;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.support.converter.AbstractJsonMessageConverter;
import org.springframework.amqp.support.converter.ClassMapper;
import org.springframework.amqp.support.converter.DefaultClassMapper;
import org.springframework.amqp.support.converter.MessageConversionException;

import com.google.gson.Gson;

public class Gson2JsonMessageConverter extends AbstractJsonMessageConverter{

      private static Log log = LogFactory.getLog(Gson2JsonMessageConverter.class);  

        private static  ClassMapper classMapper =  new DefaultClassMapper();  

        private static Gson gson = new Gson();  

        public Gson2JsonMessageConverter() {
            super();
        }  

        @Override
        protected Message createMessage(Object object,
                MessageProperties messageProperties) {
            byte[] bytes = null;
            try {
                String jsonString = gson.toJson(object);
                bytes = jsonString.getBytes(getDefaultCharset());
            }
            catch (IOException e) {
                throw new MessageConversionException(
                        "Failed to convert Message content", e);
            }
            messageProperties.setContentType(MessageProperties.CONTENT_TYPE_JSON);
            messageProperties.setContentEncoding(getDefaultCharset());
            if (bytes != null) {
                messageProperties.setContentLength(bytes.length);
            }
            classMapper.fromClass(object.getClass(),messageProperties);
            return new Message(bytes, messageProperties);
        }  

        @Override
        public Object fromMessage(Message message)
                throws MessageConversionException {
            Object content = null;
            MessageProperties properties = message.getMessageProperties();
            if (properties != null) {
                String contentType = properties.getContentType();
                if (contentType != null && contentType.contains("json")) {
                    String encoding = properties.getContentEncoding();
                    if (encoding == null) {
                        encoding = getDefaultCharset();
                    }
                    try {
                            Class<?> targetClass = getClassMapper().toClass(
                                    message.getMessageProperties());
                            content = convertBytesToObject(message.getBody(),
                                    encoding, targetClass);
                    }
                    catch (IOException e) {
                        throw new MessageConversionException(
                                "Failed to convert Message content", e);
                    }
                }
                else {
                    log.warn("Could not convert incoming message with content-type ["
                            + contentType + "]");
                }
            }
            if (content == null) {
                content = message.getBody();
            }
            return content;
        }  

        private Object convertBytesToObject(byte[] body, String encoding,
                Class<?> clazz) throws UnsupportedEncodingException {
            String contentAsString = new String(body, encoding);
            return gson.fromJson(contentAsString, clazz);
        }
}

发送类接口：

public interface MQProducer {
    /**
     * 发送消息到指定队列
     * @param queueKey
     * @param object
     */
    public void sendDataToQueue(String queueKey, Object object);
}

实现类：test是测试用的。

package sendMQ;

import java.util.HashMap;
import java.util.Map;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Component;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(value = SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {
    "classpath:/spring-common.xml"})

@Component
public class MQProducerImpl implements MQProducer {

    @Autowired
    private  AmqpTemplate amqpTemplate;

        @Override
        public void sendDataToQueue(String queueKey, Object object) {
            System.out.println("--"+amqpTemplate);
            try {
                amqpTemplate.convertAndSend(object);
                System.out.println("------------消息发送成功");
            } catch (Exception e) {
                System.out.println(e);
            }

        }

        @Test
      public  void test() {
            Map<String,Object> msg = new HashMap<>();
            msg.put("data","hello,456");
            while(true){
            amqpTemplate.convertAndSend(msg);
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            }

        }  

}

接收端配置：

  <!-- 连接服务配置  -->
    <rabbit:connection-factory id="connectionFactory" host="localhost" username="guest"
        password="guest" port="5672" virtual-host="/"  channel-cache-size="5" />  

   <rabbit:admin connection-factory="connectionFactory"/>  

   <!-- queue 队列声明-->
   <rabbit:queue durable="true" auto-delete="false" exclusive="false" name="spring.queue.tag"/>  

   <!-- exchange queue binging key 绑定 -->
    <rabbit:direct-exchange name="spring.queue.exchange" durable="true" auto-delete="false">
        <rabbit:bindings>
            <rabbit:binding queue="spring.queue.tag" key="spring.queue.tag.key"/>
        </rabbit:bindings>
    </rabbit:direct-exchange>  

    <bean id="receiveMessageListener"
        class="receiveMQ.QueueListenter" />  

    <!-- queue litener  观察 监听模式 当有消息到达时会通知监听在对应的队列上的监听对象-->
    <rabbit:listener-container connection-factory="connectionFactory" acknowledge="auto" >
        <rabbit:listener queues="spring.queue.tag" ref="receiveMessageListener" />
    </rabbit:listener-container>  

接收端代码：

package receiveMQ;

import java.io.UnsupportedEncodingException;

import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageListener;

public class QueueListenter implements MessageListener{
    @Override
    public void onMessage(Message msg) {
         try {
            System.out.print("-------------------"+new String(msg.getBody(),"UTF-8"));
        } catch (UnsupportedEncodingException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
    }

}

接收端测试启动：

package receiveMQ;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ConsumerMain {
    public static void main(String[] args) {
        new ClassPathXmlApplicationContext("spring-common.xml");
    }
}

上面代码均有注释，应该不难看懂，复制即可使用，实现了MQ的简单功能。

说明：可以配置多个接收端，spring默认的是负载均衡机制，每个接收端接收一条的来，这些扩展功能待后面有时间再讲解