rabbitMQ教程（三） 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