RabbitMQ簡單收發,HelloWorld
前言
接觸RabbitMQ有一週多的時間了，對RabbitMQ有了自己的一些粗淺的見解，想和大家分享下，本文先講解簡單的RabbitMQ收發操作，沒有做任何的處理，參考了官網的資料進行編寫，並加入個人的一些見解，不對之處請多多指教。
一.定義
二.角色定義
在這簡單的收發模型中有三個角色分別是生產者（ｐｒｏｄｕｃｅｒ）、消息隊列（ｍｅｓｓａｇｅ ｑｕｅｕｅ）、消費者（ｃｏｎｓｕｍｍｅｒ）
ａ、生產者，主要是發送消息給消息隊列
b、消息隊列，它存在於RabbitMQ中，所有的信息都會存放到消息隊列中，遵循先進先出的存儲方式，當接受到請求，將數據發送出去，如果接到已被消費的ACK（回執），這該消息將從隊列中移除。
c、消費者，從消息隊列中獲取數據，並返回ACK給RabbitMQ。
這是簡單的收發過程圖。
三.預置條件
1.下載Erlang http://docs.basho.com/riak/1.3.0/tutorials/installation/Installing-Erlang/
2.下載RabbitMQ http://www.rabbitmq.com/releases/rabbitmq-server/v3.3.4/rabbitmq-server-3.3.4.exe
3.下載依賴包 amqp-client-4.0.2.jar slf4j-api-1.7.21.jar slf4j-simple-1.7.22.jar
四.sending
import java.io.IOException;
import java.util.concurrent.TimeoutException;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
/**
* 發送消息端
* @author sibat
*
*/
public class Send {
private final static String QUEUE_NAME = "hello";
public static void main(String[] args) {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("127.0.0.1");
factory.setPort(5672);
Connection connection = null;
Channel channel = null;
try {
connection = factory.newConnection();
channel= connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false,false,null);
String msg = "I am comming";
channel.basicPublish("", QUEUE_NAME, null, msg.getBytes());
System.out.println("producer send " + "'"+ msg + "'");
} catch (IOException | TimeoutException e) {
e.printStackTrace();
}finally{
if (channel != null) {
try {
channel.close();
} catch (IOException | TimeoutException e) {
e.printStackTrace();
}
}
if (connection != null) {
try {
connection.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}五.Receiving
有一個函數要注意的是channel.basicConsume(),第二個參數爲true，意思是自動返回ACK，即queue在傳遞信息給consumer後就會立馬收到ACK，queue不再對這個消息進行存儲了。
channel.basicConsume(QUEUE_NAME, true, consumer);import java.io.IOException;
import java.util.concurrent.TimeoutException;
import com.rabbitmq.client.AMQP.BasicProperties;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Consumer;
import com.rabbitmq.client.ConsumerCancelledException;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;
import com.rabbitmq.client.ShutdownSignalException;
public class Recv {
private static final String QUEUE_NAME = "hello";
public static void main(String[] args) throws IOException, TimeoutException, ShutdownSignalException, ConsumerCancelledException, InterruptedException {
ConnectionFactory factory = new ConnectionFactory();
//設置MabbitMQ所在主機ip或者主機名
factory.setHost("127.0.0.1");
factory.setPort(5672);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
//創建隊列消費者
Consumer consumer = new DefaultConsumer(channel){
@Override
public void handleDelivery(String consumerTag,
Envelope envelope, BasicProperties properties,
byte[] body) throws IOException {
String message = new String(body, "UTF-8");
System.out.println(" [x] Received '" + message + "'");
}
};
channel.basicConsume(QUEUE_NAME, true, consumer);
}
}五.輸出結果
producer send 'I am comming'接收端：
[*] Waiting for messages. To exit press CTRL+C
[x] Received 'I am comming'