Apache ActiveMQ - 消费者应用程序



现在让我们创建一个消费者应用程序,它将从 ActiveMQ 队列接收消息。

创建项目

使用 Eclipse,选择文件新建Maven 项目。勾选创建简单项目(跳过原型选择),然后单击下一步。

输入详细信息,如下所示 −

  • groupId − com.tutorialspoint

  • artifactId − consumer

  • version − 0.0.1-SNAPSHOT

  • name − ActiveMQ 消费者

点击完成按钮,创建一个新项目。

pom.xml

现在,更新 pom.xml 内容以包含对 ActivieMQ 的依赖项。

<project xmlns="http://maven.apache.org/POM/4.0.0" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
   https://maven.apache.org/xsd/maven-4.0.0.xsd">
   
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.tutorialspoint.activemq</groupId>
   <artifactId>consumer</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>ActiveMQ Consumer</name>
   <dependencies>
      <dependency>
         <groupId>org.apache.geronimo.specs</groupId>
         <artifactId>geronimo-jms_1.1_spec</artifactId>
         <version>1.1</version>
      </dependency>
      <dependency>
         <groupId>org.apache.qpid</groupId>
         <artifactId>qpid-jms-client</artifactId>
         <version>0.40.0</version>
      </dependency>
   </dependencies>
   <build>
      <plugins>
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.1</version>
            <configuration>
               <source>1.6</source>
               <target>1.6</target>
            </configuration>
         </plugin>
         <plugin>
            <groupId>org.fusesource.mvnplugins</groupId>
            <artifactId>maven-uberize-plugin</artifactId>
            <version>1.14</version>
            <executions>
               <execution>
                  <phase>package</phase>
                  <goals><goal>uberize</goal></goals>
               </execution>
            </executions>
         </plugin>
      </plugins>
   </build>  
</project>

现在,创建一个消费者类,它将从 ActiveMQ 队列接收消息。

package com.tutorialspoint.activemq;

import java.io.Console;

import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.qpid.jms.JmsConnectionFactory;

public class Consumer {
   public static void main(String[] args) throws Exception {
      // Create a connection to ActiveMQ JMS broker using AMQP protocol
      JmsConnectionFactory factory = new JmsConnectionFactory("amqp://127.0.0.1:5672");
      Connection connection = factory.createConnection("admin", "password");
      connection.start();

      // Create a session
      Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

      // Create a queue
      Destination destination = session.createQueue("MyFirstQueue");

      // Create a consumer specific to queue
      MessageConsumer consumer = session.createConsumer(destination);

      Console c = System.console();
      String response;
      do {      	
         // Receive the message
         Message msg = consumer.receive();
         response = ((TextMessage) msg).getText();

         System.out.println("Received = "+response);

      } while (!response.equalsIgnoreCase("Quit"));

      // Close the connection
      connection.close();
   }
}

消费者类创建连接,启动会话,创建消费者,然后如果有消息从队列接收消息。如果队列包含退出消息,则应用程序终止,否则它将不断轮询队列以获取消息。

我们将在 ActiveMQ - 测试应用程序 章节中运行此应用程序。

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