一、浩言
我们要变的变态,才能吸引更多的变态。
二、背景
最近在看消息队列的东西,准备引入到项目中使用,一直说要自己先学会使用,在使用中学习。所以这算是新年的第一个周末就要加班,就在网上找资料自己尝试配置下。顺便纪录下经历了,都是有坑要去踩的。
三、ActiveMQ 在Windows下的使用
我修改了配置文件activemq.xml,将0.0.0.0改成了127.0.0.1
<transportConnectors>
<!-- DOS protection, limit concurrent connections to 1000 and frame size to 100MB -->
<transportConnector name="openwire" uri="tcp://127.0.0.1:61616?maximumConnections=1000&wireFormat.maxFrameSize=104857600000"/>
<transportConnector name="amqp" uri="amqp://127.0.0.1:5672?maximumConnections=1000&wireFormat.maxFrameSize=104857600000"/>
<transportConnector name="stomp" uri="stomp://127.0.0.1:61613?maximumConnections=1000&wireFormat.maxFrameSize=104857600000"/>
<transportConnector name="mqtt" uri="mqtt://127.0.0.1:1883?maximumConnections=1000&wireFormat.maxFrameSize=104857600000"/>
<transportConnector name="ws" uri="ws://127.0.0.1:61614?maximumConnections=1000&wireFormat.maxFrameSize=104857600000"/>
</transportConnectors>
注意点:我在测试的时候一直报1G要大于maxFrameSize的100M,所以我在这个后面加了三个0
然后启动启动active
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我们在windows下使用这个命令查看端口netstat -ano linux下可以使用netstat -lntp查看
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在浏览器中输入:http://127.0.0.1:8161/admin/index.jsp会有如下显示
<?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:amq="http://activemq.apache.org/schema/core"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core-5.8.0.xsd">
<bean id="targetConnectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
<property name="brokerURL" value="tcp://127.0.0.1:61616"></property>
<!-- <property name="brokerURL" value="http://127.0.0.1:61616"></property> -->
<property name="useAsyncSend" value="true"></property>
<property name="alwaysSessionAsync" value="true"></property>
<property name="useDedicatedTaskRunner" value="true"></property>
</bean>
<!-- 发送消息的目的地 -->
<bean id="destination" class="org.apache.activemq.command.ActiveMQQueue">
<!-- 消息队列的名字 -->
<constructor-arg value="mahone.queue"/>
</bean>
</beans>
注意点:我在这里面看到的我有个注释的配置brokerURL,我刚刚开始的时候一直配置成http...,然后怎么测试都不通,最后才发现是自己这里配置错了。
下面附上测试代码
package com.mouse.moon.test.mq;
import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestMq {
public static void sendWithAuto(ApplicationContext context) {
ActiveMQConnectionFactory factory = null;
Connection conn = null;
Destination destination = null;
Session session = null;
MessageProducer producer = null;
try {
destination = (Destination) context.getBean("destination");
factory = (ActiveMQConnectionFactory) context.getBean("targetConnectionFactory");
conn = factory.createConnection();
session = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
producer = session.createProducer(destination);
TextMessage message = session.createTextMessage("...Hello JMS-4!");
producer.send(message);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {//关闭生产者
producer.close();
producer = null;
} catch (Exception e) {
}
try {//关闭session
session.close();
session = null;
}
catch (Exception e) {
}
try { //停止连接
conn.stop();
} catch (Exception e) {
}
try {//关闭连接
conn.close();
} catch (Exception e) {
}
}
}
public static void main(String[] args) {
System.out.println("-------------start--------------");
final ApplicationContext context = new ClassPathXmlApplicationContext("classpath:/xml/activemq.xml");
sendWithAuto(context);
System.out.println("-------------end---------------");
}
}
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在做测试的时候还遇到如下问题
org.apache.activemq.ConfigurationException: There are 1 consumer options that couldn't be set on the consumer. Check the options are spelled correctly. Unknown parameters=[{perfetchSize=100}]. This consumer cannot be started.
这是在设置名字的时候附带的参数,我把这个去掉了就只能看到生产者的名字是"mahone.queue""
消费端代码:
package com.mouse.moon.test.mq;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
*
* @author Mahone
* @description:消费端
*
*/
public class TestConsumer extends Thread implements MessageListener{
private Connection conn = null;
private Destination destination = null ;
private Session session = null;
@Override
public void onMessage(Message message) {
try{
TextMessage tm = (TextMessage)message;
System.out.println("receive message:"+tm.getText());
}catch(Exception e){
e.printStackTrace();
}
}
@Override
public void run(){
receive();
}
public void receive(){
ConnectionFactory factory = null;
Connection conn = null ;
try{
final ApplicationContext context = new ClassPathXmlApplicationContext("classpath:/xml/activemq.xml");
factory = (ActiveMQConnectionFactory)context.getBean("targetConnectionFactory");
conn = factory.createConnection();
conn.start();
session = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
destination = (Destination)context.getBean("destination");
MessageConsumer consumer = session.createConsumer(destination);
consumer.setMessageListener(this);
}catch(Exception e){
e.printStackTrace();
}
}
public static void main(String args[]){
TestConsumer mythread = new TestConsumer();
mythread.start();
}
}
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上述代码有参考该<a href='http://blog.csdn.net/lifetragedy/article/details/51836557'>博客</a>
四、消息队列的作用
1:解耦操作
例如说其中A更新好了之后,其他地方(B,C,D)也需要更新,那么使用消息队列之后,A更新后,将更新通知放入消息队列中,B,C,D中需要更新只需要订阅这个操作就好,实现解耦。
2、实现异步操作
例如上面说的,A更新后,其他的更新都是异步进行处理,并不需要同步操作。
3、对流量进行控制
有时候访问多了,流量就大了,忽高忽低的,如果放入队列中,按照顺序进行操作,即是先存起来,然后在按照顺序进行发送。
五:浩语
__
__ _ ____ __| |__ _____ ___
\ \/ \/ / | \ | \\__ \ / _ \
\ /| | / Y \/ __ \( <_> )
\/\_/ |____/|___| (____ /\____/
\/ \/
任何事情都是要靠努力和用心。
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