rabbitMQ教程（四） spring整合rabbitMQ代碼實例

時間 2019-11-24

標籤 rabbitmq 教程 spring 整合代碼實例欄目 RabbitMQ 简体版

原文原文鏈接

1、開啓rabbitMQ服務，導入MQ jar包和gson jar包(MQ默認的是jackson，可是效率不如Gson，因此咱們用gson)

2、發送端配置，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">

 <!-- 鏈接服務配置 若是MQ服務器在遠程服務器上，請新建用戶用新建的用戶名密碼  guest默認不容許遠程登陸-->  
    <rabbit:connection-factory id="connectionFactory"  
        host="localhost" username="guest" password="guest" port="5672"  
        virtual-host="/" channel-cache-size="5" />  
  <!-- 配置愛admin，自動根據配置文件生成交換器和隊列，無需手動配置 -->
    <rabbit:admin connection-factory="connectionFactory" />  
  
    <!-- queue 隊列聲明 -->  
    <rabbit:queue  durable="true"  
        auto-delete="false" exclusive="false" name="spring.queue.tag" />  
  
  
    <!-- exchange queue binging key 綁定 -->  
    <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默認的是jackson 的一個插件,目的將生產者生產的數據轉換爲json存入消息隊列，因爲Gson的速度快於jackson,這裏替換爲Gson的一個實現 -->  
    <bean id="jsonMessageConverter"    class="sendMQ.Gson2JsonMessageConverter" />  
  
    <!-- spring template聲明 -->  
    <rabbit:template id="amqpTemplate" exchange="spring.queue.exchange"  routing-key="spring.queue.tag.key"  
        connection-factory="connectionFactory" message-converter="jsonMessageConverter" />

發送端代碼：GSON配置java

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);  
        }  
}

發送類接口：spring

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

實現類：test是測試用的。apache

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("------------消息發送成功");
            } 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 自動生成的 catch 塊
                e.printStackTrace();
            }
            }
           
        }  

}

接收端配置：json

  <!-- 鏈接服務配置  -->  
    <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 隊列聲明-->  
   <rabbit:queue durable="true" auto-delete="false" exclusive="false" name="spring.queue.tag"/>  
      
      
   <!-- exchange queue binging key 綁定 -->  
    <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  觀察 監聽模式 當有消息到達時會通知監聽在對應的隊列上的監聽對象-->  
    <rabbit:listener-container connection-factory="connectionFactory" acknowledge="auto" >  
        <rabbit:listener queues="spring.queue.tag" ref="receiveMessageListener" />  
    </rabbit:listener-container>

接收端代碼：服務器

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 自動生成的 catch 塊
            e.printStackTrace();
        }
    }

}

接收端測試啓動：app

package receiveMQ;

import org.springframework.context.support.ClassPathXmlApplicationContext;

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

上面代碼均有註釋，應該不難看懂，複製便可使用，實現了MQ的簡單功能。負載均衡

說明：能夠配置多個接收端，spring默認的是負載均衡機制，每一個接收端接收一條的來，這些擴展功能待後面有時間再講解ide