做中英文网站多少钱2021年网络营销考试题及答案

ActiveMQ

安装

下载网址：ActiveMQ

一定要和自己安装的jdk版本匹配，不然会报错

下载到本地之后解压缩

有可能端口号被占用

解除端口号占用，参考：Windows_端口被占用

打开cmd

查询所有的端口号

netstat -nao

查询指定端口号

netstat -ano|findstr 5672

查询什么程序在占用

tasklist | findstr "4756"

打开任务管理器看看这个程序

erl.exe是什么进程

Erlang 的执行程序，Erlang一种编程语言，多用于并发和分布式系统，现在最广泛使用在消息队列里面。

安装RabbitMQ的好像就是安装的这个，看来是RabbitMQ把这个端口给占用掉了，换个端口号

将5672改成55672

网址：http://localhost:8161/admin/

用户名：admin

密码：admin

成功。

使用

参考：消息队列之 ActiveMQ

Java访问ActiveMQ实例

引入依赖

		<dependency><groupId>org.apache.activemq</groupId><artifactId>activemq-all</artifactId><version>5.15.2</version></dependency>

消息生产者

package mq.activeMQ;import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;import javax.jms.*;public class TopicPublisher {/*** 默认用户名*/public static final String USERNAME = ActiveMQConnection.DEFAULT_USER;/*** 默认密码*/public static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD;/*** 默认连接地址*/public static final String BROKER_URL = ActiveMQConnection.DEFAULT_BROKER_URL;public static void main(String[] args) {//创建连接工厂ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(USERNAME, PASSWORD, BROKER_URL);try {//创建连接Connection connection = connectionFactory.createConnection();//开启连接connection.start();//创建会话，不需要事务Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);//创建 Topic，用作消费者订阅消息Topic myTestTopic = session.createTopic("activemq-topic-test1");//消息生产者MessageProducer producer = session.createProducer(myTestTopic);for (int i = 1; i <= 3; i++) {TextMessage message = session.createTextMessage("发送消息 " + i);producer.send(myTestTopic, message);}//关闭资源session.close();connection.close();} catch (JMSException e) {e.printStackTrace();}}
}

消息消费者

package mq.activeMQ;import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;import javax.jms.*;public class TopicSubscriber {/*** 默认用户名*/public static final String USERNAME = ActiveMQConnection.DEFAULT_USER;/*** 默认密码*/public static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD;/*** 默认连接地址*/public static final String BROKER_URL = ActiveMQConnection.DEFAULT_BROKER_URL;public static void main(String[] args) {//创建连接工厂ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(USERNAME, PASSWORD, BROKER_URL);try {//创建连接Connection connection = connectionFactory.createConnection();//开启连接connection.start();//创建会话，不需要事务Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);//创建 TopicTopic myTestTopic = session.createTopic("activemq-topic-test1");MessageConsumer messageConsumer = session.createConsumer(myTestTopic);messageConsumer.setMessageListener(new MessageListener() {@Overridepublic void onMessage(Message message) {try {System.out.println("消费者1 接收到消息：" + ((TextMessage) message).getText());} catch (JMSException e) {e.printStackTrace();}}});MessageConsumer messageConsumer2 = session.createConsumer(myTestTopic);messageConsumer2.setMessageListener(new MessageListener() {@Overridepublic void onMessage(Message message) {try {System.out.println("消费者2 接收到消息：" + ((TextMessage) message).getText());} catch (JMSException e) {e.printStackTrace();}}});MessageConsumer messageConsumer3 = session.createConsumer(myTestTopic);messageConsumer3.setMessageListener(new MessageListener() {@Overridepublic void onMessage(Message message) {try {System.out.println("消费者3 接收到消息：" + ((TextMessage) message).getText());} catch (JMSException e) {e.printStackTrace();}}});//让主线程休眠100秒，使消息消费者对象能继续存活一段时间从而能监听到消息Thread.sleep(100 * 1000);//关闭资源session.close();connection.close();} catch (Exception e) {e.printStackTrace();}}
}

gitee：JAVA集成AcitveMQ

启动ActiveMQ服务器

启动

Spring整合ActiveMQ

引入依赖

<dependency><groupId>org.apache.activemq</groupId><artifactId>activemq-all</artifactId><version>5.15.2</version>
</dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jms</artifactId><version>4.3.10.RELEASE</version>
</dependency><dependency><groupId>org.apache.activemq</groupId><artifactId>activemq-pool</artifactId><version>5.15.0</version>
</dependency>

Spring配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.0.xsd"><!--这里要改base-package="基础包"--><!--下面还有要改的，看注释--><context:component-scan base-package="com.example.spring_activemq.activeMQ"/><!--连接池--><bean id="jmsFactory" class="org.apache.activemq.pool.PooledConnectionFactory" destroy-method="stop"><property name="connectionFactory"><bean class="org.apache.activemq.ActiveMQConnectionFactory"><property name="brokerURL"><value>tcp://localhost:61616</value></property></bean></property><property name="maxConnections" value="100"></property></bean><!--缓存--><bean id="cachingConnectionFactory" class="org.springframework.jms.connection.CachingConnectionFactory"><property name="targetConnectionFactory" ref="jmsFactory"/><property name="sessionCacheSize" value="1"/></bean><bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate"><!--获取连接、会话等对象--><property name="connectionFactory" ref="cachingConnectionFactory"/><!--消息转换器--><property name="messageConverter"><bean class="org.springframework.jms.support.converter.SimpleMessageConverter"/></property></bean><!--实际发送和接收消息的目的地--><bean id="testQueue" class="org.apache.activemq.command.ActiveMQQueue"><constructor-arg name="name" value="spring-queue"/></bean><bean id="testTopic" class="org.apache.activemq.command.ActiveMQTopic"><constructor-arg index="0" value="spring-topic"/></bean><!--这里也要改class=""--><!--队列消息下的监视器--><bean id="queueListener" class="com.example.spring_activemq.activeMQ.QueueListener"/><!--主题模式下的接收器--><bean id="topic1Listener" class="com.example.spring_activemq.activeMQ.Topic1Listener"/><bean id="topic2Listener" class="com.example.spring_activemq.activeMQ.Topic2Listener"/><!--将消息监视器绑定到具体的消息目的地上--><bean id="queueContainer"class="org.springframework.jms.listener.DefaultMessageListenerContainer"><property name="connectionFactory" ref="cachingConnectionFactory"/><property name="destination" ref="testQueue"/><property name="messageListener" ref="queueListener"/></bean><bean id="topic1Container"class="org.springframework.jms.listener.DefaultMessageListenerContainer"><!--缓存--><property name="connectionFactory" ref="cachingConnectionFactory"/><!--目的地--><property name="destination" ref="testTopic"/><!--监视器--><property name="messageListener" ref="topic1Listener"/></bean><bean id="topic2Container"class="org.springframework.jms.listener.DefaultMessageListenerContainer"><property name="connectionFactory" ref="cachingConnectionFactory"/><property name="destination" ref="testTopic"/><property name="messageListener" ref="topic2Listener"/></bean></beans>

消息服务类

package com.example.spring_activemq.activeMQ;import org.springframework.jms.core.JmsTemplate;
import org.springframework.jms.core.MessageCreator;
import org.springframework.stereotype.Service;import javax.annotation.Resource;
import javax.jms.*;@Service
public class MessageService {@Resource(name = "jmsTemplate")private JmsTemplate jmsTemplate;@Resource(name = "testQueue")private Destination testQueue;@Resource(name = "testTopic")private Destination testTopic;//向队列发送消息public void sendQueueMessage(String messageContent) {jmsTemplate.send(testQueue, new MessageCreator() {@Overridepublic Message createMessage(Session session) throws JMSException {TextMessage msg = session.createTextMessage();// 设置消息内容msg.setText(messageContent);return msg;}});}//向主题发送消息public void sendTopicMessage(String messageContent) {jmsTemplate.send(testTopic, new MessageCreator() {@Overridepublic Message createMessage(Session session) throws JMSException {TextMessage msg = session.createTextMessage();// 设置消息内容msg.setText(messageContent);return msg;}});}
}

消息监听器类

队列监听器

package com.example.spring_activemq.activeMQ;import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;public class QueueListener implements MessageListener {@Overridepublic void onMessage(Message message) {if (message instanceof TextMessage) {try {TextMessage txtMsg = (TextMessage) message;String messageStr = txtMsg.getText();System.out.println("队列监听器接收到文本消息：" + messageStr);} catch (JMSException e) {e.printStackTrace();}} else {throw new IllegalArgumentException("只支持 TextMessage 类型消息！");}}
}

订阅消息监听器

package com.example.spring_activemq.activeMQ;import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;public class Topic1Listener implements MessageListener {@Overridepublic void onMessage(Message message) {if (message instanceof TextMessage) {try {TextMessage txtMsg = (TextMessage) message;String messageStr = txtMsg.getText();System.out.println("主题监听器1 接收到文本消息：" + messageStr);} catch (JMSException e) {e.printStackTrace();}} else {throw new IllegalArgumentException("只支持 TextMessage 类型消息！");}}
}

package com.example.spring_activemq.activeMQ;import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;public class Topic2Listener implements MessageListener {@Overridepublic void onMessage(Message message) {if (message instanceof TextMessage) {try {TextMessage txtMsg = (TextMessage) message;String messageStr = txtMsg.getText();System.out.println("主题监听器2 接收到文本消息：" + messageStr);} catch (JMSException e) {e.printStackTrace();}} else {throw new IllegalArgumentException("只支持 TextMessage 类型消息！");}}
}

启动应用

package com.example.spring_activemq.activeMQ;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class StartApplication {public static void main(String[] args) {//这里总是显示空指针，找半天也没找出来哪里错了，不找了，等以后学学再找。ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:spring-context.xml");MessageService messageService = (MessageService) ctx.getBean("messageService");messageService.sendQueueMessage("我的测试消息1");messageService.sendTopicMessage("我的测试消息2");messageService.sendTopicMessage("我的测试消息3");}}

gitee：Spring集成ActiveMQ