SpringBoot + RabbitMQ 应用

RabbitMq的配置这里不做解释，安装语言包、客户端、使用控制插件等。

需要准备的导入

    org.springframework.boot
    spring-boot-starter-amqp

yml文件配置(给出了简单配置，具体配置这里是官方的：https://github.com/spring-projects/spring-boot/blob/v2.0.3.RELEASE/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/amqp/RabbitProperties.java
)：

spring:
#rabbitmq
rabbitmq:
   host: 127.0.0.1
   port: 5672
   username: admin
   password: 123456
   #自己的域
   virtual-host: dc
   #永久连接
   connection-timeout: 0 

接下来是配置类，主要功能是配置RabbitAdmin（暂时好像必须自己配置进Spring） 和 RabbitTemplate（这个是可以自己直接注入的，也可以在配置类里进行一些处理），和自己定义 一些固定的Exchange或者Queue。配置代码例如：

 @Configuration
public class RabbitmqConfig {
    @Value("${ExchangeName}")
    private String exchangeName;


    /**
     * 创建admin，为了能自定义队列或交换机
     * @return
     */
    @Bean
    RabbitAdmin rabbitAdmin(ConnectionFactory connectionFactory) {
        return new RabbitAdmin(connectionFactory);
    }

    @Bean
    public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory){
        RabbitTemplate rabbitTemplate=new RabbitTemplate(connectionFactory);
        //数据转换为json存入消息队列
        rabbitTemplate.setMessageConverter(new Jackson2JsonMessageConverter());
        //  rabbitTemplate.setReplyAddress(replyQueue().getName());
        //  rabbitTemplate.setReplyTimeout(100000000);
        //发布确认
        return rabbitTemplate;
    }

    @Bean
    public TopicExchange exchange(RabbitAdmin rabbitAdmin){
        TopicExchange dataExchange = new TopicExchange(exchangeName,true,false);
        rabbitAdmin.declareExchange(dataExchange);
        return dataExchange;
    }


}

需要注意的是在IDEA工具中，这类里会出现“Could not autowire. No beans of 'ConnectionFactory' type found” 这样的警告，但是启动并不会报错。

这样的配置之下，已经拥有了rabbitmq连接、并且注入了RabbitAbmin，就能动态的去对Exchange、Queue操作。
创建Exchange：

 /**
  * FanoutExchange、TopicExchange、HeadersExchange 等
  * 都是同一个父类 AbstractExchange
  */
 //FanoutExchange fanoutExchange = new FanoutExchange(exchangeName,true,false);
 TopicExchange dataExchange = new TopicExchange(exchangeName,true,false);
 rabbitAdmin.declareExchange(dataExchange);

删除Exchange:

rabbitAdmin.deleteExchange(exchangeName);

创建Queue:

 Queue queue = new Queue(queueName,true,false,false);
 rabbitAdmin.declareQueue(queue);

删除Queue：

 rabbitAdmin.deleteQueue(queueName);

建立绑定(这里给出Topic的匹配绑定)：

Binding binding = BindingBuilder.bind(queue).to(topicExchange).with(routingKey+".#");
rabbitAdmin.declareBinding(binding);

发送消息：

@Component
public class SendMessage {

    private final static Logger logger = LoggerFactory.getLogger(SendMessage.class);

    private RabbitAdmin rabbitAdmin;
    @Autowired
    public void setRabbitAdmin(RabbitAdmin rabbitAdmin) {
        this.rabbitAdmin = rabbitAdmin;
    }
    private RabbitTemplate rabbitTemplate;
    @Autowired
    public void setRabbitTemplate(RabbitTemplate rabbitTemplate) {
        this.rabbitTemplate = rabbitTemplate;
    }

    private TopicExchange topicExchange;
    @Autowired
    public void setTopicExchange(TopicExchange topicExchange) {
        this.topicExchange = topicExchange;
    }

    /**
     * 有绑定Key的Exchange发送
     * @param routingKey
     * @param msg
     */
    public void sendMessage(String routingKey, Object msg){
        rabbitTemplate.setExchange(topicExchange.getName());
        rabbitTemplate.setRoutingKey(routingKey);
        //send方法复杂不会序列化
        rabbitTemplate.convertAndSend(routingKey,msg);
    }

    /**
     * 没有绑定KEY的Exchange发送
     * @param exchange
     * @param msg
     */
    public void sendMessage( AbstractExchange exchange, String msg){
        rabbitAdmin.declareExchange(exchange);
        rabbitTemplate.setExchange(exchange.getName());
        logger.info("RabbitMQ send "+exchange.getName()+"->"+msg);
        rabbitTemplate.send(new Message(msg.getBytes(), new MessageProperties()));
    }
        
    
}

动态订阅：
1.注入Bean

  @Bean
    public SimpleMessageListenerContainer container(ConnectionFactory connectionFactory){
        return new SimpleMessageListenerContainer(connectionFactory);
    }

2.自定义接收类

/**
 * 自定义消息接收类
 * @author lc
 */
public class Receive {

    public void handleMessage(String message){
        System.err.println("handleMessage: "+ message);
    }

    public void process(String msg){
        System.err.println("Process: "+ msg);
    }
}

3.定义动态订阅

/**
 * 动态订阅
 */
@Component
@Order(10)
public class MyApplicationRunner implements CommandLineRunner {

    @Override
    public void run(String... args) throws Exception {
        SimpleMessageListenerContainer container = SpringUtil.getBean(SimpleMessageListenerContainer.class);
        MessageListenerAdapter messageListenerAdapter = new MessageListenerAdapter(new Receive());
        messageListenerAdapter.addQueueOrTagToMethodName("QueueName","handleMessage");
        messageListenerAdapter.addQueueOrTagToMethodName("lcTest","process");
        String[] strings = {"QueueName","lcTest"};
        container.addQueueNames(strings);
        container.setMessageListener(messageListenerAdapter);
    }
}

后端的话暂时就用到这些，后面再有新的使用会持续更新。前端还用到了RabbitMq的webstomp插件，直接将消息推给前端。

代码： https://gitee.com/leichencode/rabbitmqDemo.git