rabbitMQ教程（三） spring整合rabbitMQ代码实例

skypaladin

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