Springboot and Messages (RabbitMQ)

1. JMS and AMQP

• JMS (Java Message Service):
  • ACTIVEMQ is a JMS implementation;
• AMQP (Advanced Message Queuing Protocol)
  • Compatible with JMS
  • RABBITMQ is the implementation of AMQP

2. RabbitMQ Introduction

• Message: Consists of the message header and the message body, the message body is opaque, and the message header consists of a series of optional attributes;
• Publisher: A client application that publishes messages to the exchanger;
• Exchange: Used to receive messages sent by the producer and route them to the queue in the server;
  • There are four types: direct (default), Fanout,topic and headers;
• Queue: Used to save the message until it is sent to the consumer, is the message container;
• Binding: Used for correlation between message queues and switches;
• Connection: A network connection, such as a TCP connection;
• Channel: An independent two-way data flow channel in multiplexed connections;
• Consumer: The consumer of the message, which represents a client application that obtains the message from the message queue;
• Virtual Host: A virtual host that represents a batch of switches, message queues, and related objects; Each vhost is essentially a mini version of the RABBITMQ server;
• Broker: Represents a Message Queuing server entity;

3. RabbitMQ Integration (springboot)

• automatic configuration:
  • rabbitautoconfiguration
  • automatically configured connection factory connectionfactory ;
  • rabbitproperties encapsulates the configuration of the RABBITMQ;
  • rabbittemplate : Send and receive messages to RABBITMQ;
  • ampqadmin : RABBITMQ System Management functional component;
  • @EnableRabbit : Turn on annotation-based RABBITMQ mode;
  • @EnableRabbit and @RabbitListener to listen for the contents of the message queue;

Application.properties configuration file Spring.rabbitmq.host=localhostspring.rabbitmq.username= guestspring.rabbitmq.password=guest//Test Class @runwith (Springrunner.class) @SpringBootTestpublic class applicationtests    {@Autowired rabbittemplate rabbittemplate; @Test public void Contextloads () {///point-to-point messages//message needs to construct itself, define the message body content and message header//Rabbittemplate.send (        Exchange, Routekey, message);        Rabbittemplate.convertandsend (Exchange, Routekey, object)//Only incoming object to be sent, automatically serialized to Rabbitmq, object by default as message body        map<string, object> map = new hashmap<> ();        Map.put ("msg", "Hurried me to ...");        Map.put ("Data", Arrays.aslist ("777477", 232,true));    Rabbittemplate.convertandsend ("Exchange.direct", "atnoodles.news", map);        }//Receive message @Test public void receive () {Object o = Rabbittemplate.receiveandconvert ("Atnoodles.news");       System.out.println (O.getclass ());    Class java.util.HashMap System.our.println (o); }}//If you need toTo automatically convert the data sent to JSON, send it out//Com.noodles.springboot.rabbitmq.config.MyAMQPConfig.javaimport Org.springframework.amqp.support.converter.jackson2jsonmessageconverter;import Org.springframework.amqp.support.converter.messageconverter;import Org.springframework.context.annotation.Bean; Import org.springframework.context.annotation.Configuration; @Configurationpublic class myamqpconfig{@Bean public Me    Ssageconverter Messageconverter () {return new Jackson2jsonmessageconverter (); }}

4. Ampqadmin

• Create and delete Queue, Exchange, Binding

// 测试类@RunWith(SpringRunner.class)@SpringBootTestpublic class ApplicationTests{    @Autowired    AmqpAdmin amqpAdmin;    @Test    public void createExchange(){        // 创建 Exchange        amqpAdmin.declareExchange(new DirectExchange("amqpAdmin.exchange"));        System.out.println("创建完成...");        // 创建 Queue        amqpAdmin.declareQueue(new Queue("amqpAdmin.queue", true));    }}

Resources:

• Springboot and messages
• RabbitMQ installation (Windows)
• MAC installation RABBITMQ
• Start/Stop RABBITMQ

Springboot and Messages (RabbitMQ)