RABBITMQ Study First: Connect with Java RABBITMQ

1. What is RABBITMQ

MQ (Message queue): A queue of messages that is designed by the server to store a large number of messages and provides a way for the client to operate the queue: the production queue (adding data to the queue), the consumption queue (fetching data from the queue). 　　 RABBITMQ is a typical application based on Message Queuing. RABBITMQ In addition to the normal production and consumption functions, there are some advanced features: Fair distribution, polling distribution, road by mode, wildcard mode, publish subscription, queue persistence.

2, Java implementation of RABBITMQ connection

2.1. RABBITMQ Client Jar Package

<Dependency>    <groupId>Com.rabbitmq</groupId>    <Artifactid>Amqp-client</Artifactid>    <version>4.0.2</version></Dependency>

2.2. Java Connection RABBITMQ Tool class

 Public classconnectionutil{Private StaticLogger Logger = Logger.getlogger (connectionutil.class);  Public StaticConnection getconnection () {Try{Connection Connection=NULL; //Define a connection factoryConnectionFactory factory =NewConnectionFactory (); //set the server-side address (domain address/IP)Factory.sethost ("127.0.0.1"); //Set server port numberFactory.setport (5672); //setting up a virtual host (equivalent to a library in a database)Factory.setvirtualhost ("/"); //Set user nameFactory.setusername ("admin"); //Set PasswordFactory.setpassword ("888888"); Connection=factory.newconnection (); returnconnection; }        Catch(Exception e) {return NULL; }    }}

2.3. Simple producer-consumer model

Work map taken from the production and consumption model of the official website (RabbitMQ)

P: Producer of messages

C: Consumer of the message

Red: Queue

The producer sends the message to the queue and the consumer gets the message from the queue.

2.4. Producer (Send)

 Public classsend{//Queue name    Private Static FinalString queue_name = "Test_simple_queue";  Public Static voidMain (string[] args) {Try        {            //Get ConnectionsConnection Connection =connectionutil.getconnection (); //get a channel from the connectionChannel Channel =Connection.createchannel (); //declaring queuesChannel.queuedeclare (Queue_name,false,false,false,NULL); String message= "This is a simple queue"; //Send MessageChannel.basicpublish ("", Queue_name,NULL, Message.getbytes ("Utf-8")); System.out.println ("[Send]:" +message);            Channel.close ();        Connection.close (); }        Catch(IOException |timeoutexception e)        {E.printstacktrace (); }    }}

Operation Result:
[Send]:this is simple queue

2.5. Consumer (Receive)

 Public classreceive{//Queue name    Private Static FinalString queue_name = "Test_simple_queue";  Public Static voidMain (string[] args) {Try        {            //Get ConnectionsConnection Connection =connectionutil.getconnection (); //get a channel from the connectionChannel Channel =Connection.createchannel (); //declaring queuesChannel.queuedeclare (Queue_name,false,false,false,NULL); //Define consumerDefaultconsumer consumer =NewDefaultconsumer (channel) {//Execute callback method when message arrives@Override Public voidhandledelivery (String consumertag, Envelope Envelope, basicproperties properties,byte[] body)throwsIOException {String message=NewString (Body, "utf-8"); System.out.println ("[Receive]:" +message);            }            }; //Listening QueueChannel.basicconsume (Queue_name,true, consumer); }        Catch(IOException | shutdownsignalexception |consumercancelledexception e)        {E.printstacktrace (); }}} Run result: [Receive]:this is simple queue

Summary: The simple producer-consumer model realizes the production data of the producer to the queue, and the consumer can listen to the queue continuously and fetch the data from the queue.

Note: This article only represents personal understanding and views yo! I have no relationship with the company and the group!

RABBITMQ Study First: Connect with Java RABBITMQ