- 准备好ActiveMQ
- 官网下载ActiveMQ: http://activemq.apache.org/download.html
- 下载之后，解压缩到当前目录，进入到解压缩后的目录中/bin/，执行activemq start 命令启动ActiveMQ，打开浏览器，输入http://localhost:8161/admin/ 进入ActiveMQ管理页面，默认有两个登录用户admin user 密码账号一样，如需修改，可以到ActiveMQ目录下的conf/ 目录下，打开jetty-realm.properties文件设置。
ActiveMQ默认的端口是8161，至此，ActiveMQ安装好。
- 设置Tomcat容器中队列相关参数
进入Tomcat安装目录，进入conf/ 目录打开context.xml，在<Context>标签中添加两个<Resource>标签，一个是ActiveMQ消息队列的连接工厂，一个是消息队列的队列名称
<Resource name="queue/connectionFactory"
auth="Container"
type="org.apache.activemq.ActiveMQConnectionFactory"
description="JMS Connection Factory"
factory="org.apache.activemq.jndi.JNDIReferenceFactory"
brokerURL="tcp://localhost:61616"
brokerName="LocalActiveMQBroker" />
<Resource name="queue/queue0"
auth="Container"
type="org.apache.activemq.command.ActiveMQQueue"
description="My Queue"
factory="org.apache.activemq.jndi.JNDIReferenceFactory"
physicalName="TomcatQueue" />
配置完毕，关闭结束。
JNDI(Java Naming and Directory Interface)是一个标准规范，类似于JDBC，JMS等规范，为开发人员提供了查找和访问各种命名和目录服务的通用、统一的接口。J2EE 规范要求所有 J2EE 容器都要提供 JNDI 规范的实现，因此Tomcat就实现了JNDI 规范。
上面的操作就是配置Tomcat的JNDI。
- 开发消息队列的web应用，使用Tomcat运行。
开发IDE：Eclipse,
- 设置Eclipse中的服务器为本地自己安装的Tomcat，也就是上面配置了Resource标签的那个Tomcat。步骤如下图
- 创建Maven工程，选择archetypes为webapp，项目名称为ActiveMQDemo，打开pom.xml文件添加ActiveMQ的依赖：
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-all</artifactId>
<version>5.15.8</version>
</dependency>
创建消息生产者servlet类：
package com.test.activemq;
import java.io.IOException;
import java.io.PrintWriter;
import javax.jms.DeliveryMode;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSender;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/Send")
public class Send extends HttpServlet {
private static final long serialVersionUID = 1L;
public Send() {
super();
// TODO Auto-generated constructor stub
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
PrintWriter out = resp.getWriter();
try{
// get the initial context
InitialContext context = new InitialContext();
// lookup the queue object
Queue queue = (Queue) context.lookup("java:comp/env/queue/queue0");
// lookup the queue connection factory
QueueConnectionFactory conFactory = (QueueConnectionFactory) context.lookup("java:comp/env/queue/connectionFactory");
// create a connection
QueueConnection queueConn = conFactory.createQueueConnection();
// create a queue session
QueueSession queSession = queueConn.createQueueSession(false,Session.DUPS_OK_ACKNOWLEDGE);
// create a queue sender
QueueSender queSender = queSession.createSender(queue);
queSender.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
// create a simple message to say "Hello World"
TextMessage message = queSession.createTextMessage("Hello World");
// send the message
queSender.send(message);
// print what we did
out.write("Message Send: " + message.getText());
// close the queue connection
queueConn.close();
} catch(Exception e){
e.printStackTrace();
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
super.doPost(req, resp);
}
}
创建消息消费者servlet类
package com.test.activemq;
import java.io.IOException;
import java.io.PrintWriter;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueReceiver;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/Receive")
public class Receive extends HttpServlet {
public Receive() {
super();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
PrintWriter out = resp.getWriter();
try {
// get the initial context
InitialContext context = new InitialContext();
// lookup the queue object
Queue queue = (Queue) context.lookup("java:comp/env/queue/queue0");
// lookup the queue connection factory
QueueConnectionFactory conFactory = (QueueConnectionFactory) context
.lookup("java:comp/env/queue/connectionFactory");
// create a queue connection
QueueConnection queConn = conFactory.createQueueConnection();
// create a queue session
QueueSession queSession = queConn.createQueueSession(false,
Session.AUTO_ACKNOWLEDGE);
// create a queue receiver
QueueReceiver queReceiver = queSession.createReceiver(queue);
// start the connection
queConn.start();
// receive a message
TextMessage message = (TextMessage) queReceiver.receive();
// print the message
out.write("Message Received: " + message.getText());
// close the queue connection
queConn.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
super.doPost(req, resp);
}
}
- 将项目部署到Tomcat
File-->New-->Other，搜索Server，然后点next，直到下面弹框出现，按步骤操作最后finish，
点击Windows-->Show View-->Other，搜索Server，出现Server工作台，选择创建好的TomcatServer，右键启动。http://localhost/ActiveMQDemo 访问到这个项目的首页，http://localhost/ActiveMQDemo/Send生成消息到ActiveMQ，http://localhost/ActiveMQDemo/Receive获取一个ActiveMQ消息。