Create a simple Hello World case

1. Create a simple Hello World case

First you need to import the activemq-all-5.14.5.jar package and write the production side:

package com.ietree.mq.helloworld;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.DeliveryMode;import javax.jms.Destination;import javax.jms.MessageProducer;import javax.jms.Session;import javax.jms.TextMessage;import org.apache.activemq.ActiveMQConnectionFactory;public class Sender {public static void main(String[] args) throws Exception {// 第一步：建立ConnectionFactory工厂对象，需要填入用户名、密码、以及要连接的地址，均使用默认即可，默认端口为：tcp://localhost:61616ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(ActiveMQConnectionFactory.DEFAULT_USER,
                ActiveMQConnectionFactory.DEFAULT_PASSWORD, "tcp://localhost:61616");// 第二步：通过ConnectionFactory工厂对象我们创建一个Connection链接，并且调用ConnectionFactory的start方法开启链接，Connection默认是关闭的Connection connection = connectionFactory.createConnection();
        connection.start();// 第三步：通过Connection对象创建Session会话（上下文环境对象），用于接收消息，参数配置1为是否启用事务，参数配置2为签收模式，一般我们设置为自动签收Session session = connection.createSession(Boolean.FALSE, Session.AUTO_ACKNOWLEDGE);// 第四步：通过Session创建Destination对象，指的是一个客户端用来指定生产消息目标和消费信息来源的对象，在PTP模式中，Destination被称作Queue即队列；在Pub/Sub模式，Destination被称作Topic即主题。在程序中可以使用多个Queue和Topic。Destination destination = session.createQueue("queue1");// 第五步：我们需要通过Session对象创建消息的发送和接收对象（生产者和消费者）MessageProducer/MessageConsumer。MessageProducer messageProducer = session.createProducer(destination);// 第六步：我们可以使用MessageProducer的setDeliveryMode方法为其设置持久化特性和非持久化特性（DeliveryMode）        messageProducer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);// 第七步：最后我们使用JMS规范的TextMessage形式创建数据（通过Session对象），并用MessageProducer的send方法发送数据。同理，客户端使用receive方法进行接收数据，最后需要关闭Connection连接。for (int i = 0; i < 5; i++) {
            TextMessage textMessage = session.createTextMessage();
            textMessage.setText("我是消息内容......" + i);
            messageProducer.send(textMessage);
            System.out.println("生产者：" + textMessage.getText());
        }if (connection != null) {
            connection.close();
        }
    }
}

Write Consumer side:

package com.ietree.mq.helloworld;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.Destination;import javax.jms.MessageConsumer;import javax.jms.Session;import javax.jms.TextMessage;import org.apache.activemq.ActiveMQConnectionFactory;public class Receiver {public static void main(String[] args) throws Exception {// 第一步：建立ConnectionFactory工厂对象，需要填入用户名、密码、以及要连接的地址，均使用默认即可，默认端口为：tcp://localhost:61616ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(ActiveMQConnectionFactory.DEFAULT_USER,
                ActiveMQConnectionFactory.DEFAULT_PASSWORD, "tcp://localhost:61616");// 第二步：通过ConnectionFactory工厂对象我们创建一个Connection链接，并且调用ConnectionFactory的start方法开启链接，Connection默认是关闭的Connection connection = connectionFactory.createConnection();
        connection.start();// 第三步：通过Connection对象创建Session会话（上下文环境对象），用于接收消息，参数配置1为是否启用事务，参数配置2为签收模式，一般我们设置为自动签收Session session = connection.createSession(Boolean.FALSE, Session.AUTO_ACKNOWLEDGE);// 第四步：通过Session创建Destination对象，指的是一个客户端用来指定生产消息目标和消费信息来源的对象，在PTP模式中，Destination被称作Queue即队列；在Pub/Sub模式，Destination被称作Topic即主题。在程序中可以使用多个Queue和Topic。Destination destination = session.createQueue("queue1");// 第五步：我们需要通过Session对象创建消息的发送和接收对象（生产者和消费者）MessageProducer/MessageConsumer。MessageConsumer messageConsumer = session.createConsumer(destination);        while (true) {
            TextMessage msg = (TextMessage) messageConsumer.receive();if(msg == null){break;
            }
            System.out.println("接收到的内容：" + msg.getText());
        }if (connection != null) {
            connection.close();
        }
    }
}

Check the message consumption through the http://localhost:8161/admin/queues.jsp path.

2. ActiveMQ security mechanism

activeMQ’s Web management interface: http://127.0.0.1:8161/admin
The activeMQ management console is deployed using jetty, so you need to change the password. Go to the corresponding configuration file: apache-activemq-5.14.5\conf\jetty-realm.properties
activeMQ should be set up with a security mechanism. Only users who meet the authentication can send and obtain messages, so we can also use activemq. Add security verification configuration to xml, apache-activemq-5.14.5\conf\jetty-realm.properties\activemq.xml, just add a plug-in configuration after line 123.

Add the administrative user in activemq.xml:

<!-- destroy the spring context on shutdown to stop jetty --><shutdownHooks><bean xmlns="http://www.springframework.org/schema/beans" class="org.apache.activemq.hooks.SpringContextHook" /></shutdownHooks><plugins>
            <simpleAuthenticationPlugin>
                <users>
                    <authenticationUser username="root" password="root" groups="users,admins"/>
                </users>
            </simpleAuthenticationPlugin>
        </plugins></broker>

In this way, you can only connect through the root account information.

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