最近由于公司项目需要,开始学习JMS,用的是ActiveMQ
。由于这方面
网上的例子不是很多,而且有的也不完整。于是经过几天的摸索学习,写了一个简单的小例子,现在贴出来与大家分享。
ProducerTool.java
用于发送消息:
java 代码
- package
homework;
- import
javax.jms.Connection;
- import
javax.jms.DeliveryMode;
- import
javax.jms.Destination;
- import
javax.jms.JMSException;
- import
javax.jms.MessageProducer;
- import
javax.jms.Session;
- import
javax.jms.TextMessage;
- import
org.apache.activemq
.ActiveMQ
Connection;
- import
org.apache.activemq
.ActiveMQ
ConnectionFactory;
- public
class
ProducerTool {
-
private
String user = ActiveMQ
Connection.DEFAULT_USER;
-
private
String password = ActiveMQ
Connection.DEFAULT_PASSWORD;
-
private
String url = ActiveMQ
Connection.DEFAULT_BROKER_URL;
-
private
String subject =
"TOOL.DEFAULT"
;
-
private
Destination destination =
null
;
-
private
Connection connection =
null
;
-
private
Session session =
null
;
-
private
MessageProducer producer =
null
;
-
// 初始化
-
private
void
initialize()
throws
JMSException, Exception {
- ActiveMQ
ConnectionFactory connectionFactory =
new
ActiveMQ
ConnectionFactory(
- user, password, url);
- connection = connectionFactory.createConnection();
- session = connection.createSession(
false
, Session.AUTO_ACKNOWLEDGE);
- destination = session.createQueue(subject);
- producer = session.createProducer(destination);
- producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
- }
-
// 发送消息
-
public
void
produceMessage(String message)
throws
JMSException, Exception {
- initialize();
- TextMessage msg = session.createTextMessage(message);
- connection.start();
- System.out.println(
"Producer:->Sending message: "
+ message);
- producer.send(msg);
- System.out.println(
"Producer:->Message sent complete!"
);
- }
-
// 关闭连接
-
public
void
close()
throws
JMSException {
- System.out.println(
"Producer:->Closing connection"
);
-
if
(producer !=
null
)
- producer.close();
-
if
(session !=
null
)
- session.close();
-
if
(connection !=
null
)
- connection.close();
- }
- }
ConsumerTool.java用于接受消息,我用的是基于消息监听的机制,需要实现MessageListener接口,这个接口有个
onMessage方法,当接受到消息的时候会自动调用这个函数对消息进行处理。
java 代码
- package
homework;
- import
javax.jms.Connection;
- import
javax.jms.Destination;
- import
javax.jms.JMSException;
- import
javax.jms.MessageConsumer;
- import
javax.jms.Session;
- import
javax.jms.MessageListener;
- import
javax.jms.Message;
- import
javax.jms.TextMessage;
- import
org.apache.activemq
.ActiveMQ
Connection;
- import
org.apache.activemq
.ActiveMQ
ConnectionFactory;
- public
class
ConsumerTool
implements
MessageListener {
-
private
String user = ActiveMQ
Connection.DEFAULT_USER;
-
private
String password = ActiveMQ
Connection.DEFAULT_PASSWORD;
-
private
String url = ActiveMQ
Connection.DEFAULT_BROKER_URL;
-
private
String subject =
"TOOL.DEFAULT"
;
-
private
Destination destination =
null
;
-
private
Connection connection =
null
;
-
private
Session session =
null
;
-
private
MessageConsumer consumer =
null
;
-
// 初始化
-
private
void
initialize()
throws
JMSException, Exception {
- ActiveMQ
ConnectionFactory connectionFactory =
new
ActiveMQ
ConnectionFactory(
- user, password, url);
- connection = connectionFactory.createConnection();
- session = connection.createSession(
false
, Session.AUTO_ACKNOWLEDGE);
- destination = session.createQueue(subject);
- consumer = session.createConsumer(destination);
- }
-
// 消费消息
-
public
void
consumeMessage()
throws
JMSException, Exception {
- initialize();
- connection.start();
- System.out.println(
"Consumer:->Begin listening..."
);
-
// 开始监听
- consumer.setMessageListener(
this
);
-
// Message message = consumer.receive();
- }
-
// 关闭连接
-
public
void
close()
throws
JMSException {
- System.out.println(
"Consumer:->Closing connection"
);
-
if
(consumer !=
null
)
- consumer.close();
-
if
(session !=
null
)
- session.close();
-
if
(connection !=
null
)
- connection.close();
- }
-
// 消息处理函数
-
public
void
onMessage(Message message) {
-
try
{ -
if
(message
instanceof
TextMessage) {
- TextMessage txtMsg = (TextMessage) message;
- String msg = txtMsg.getText();
- System.out.println(
"Consumer:->Received: "
+ msg);
- }
else
{ - System.out.println(
"Consumer:->Received: "
+ message);
- }
- }
catch
(JMSException e) {
-
// TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
- }
如果想主动的去接受消息,而不用消息监听的话,把consumer.setMessageListener(this)改为Message
message = consumer.receive(),手动去调用MessageConsumer的receive方法即可。
下面是测试类Test.java:
java 代码
- package
homework;
- import
javax.jms.JMSException;
- public
class
Test {
-
/**
- * @param args
- */
-
public
static
void
main(String[] args)
throws
JMSException, Exception {
-
// TODO Auto-generated method stub
- ConsumerTool consumer =
new
ConsumerTool();
- ProducerTool producer =
new
ProducerTool();
-
// 开始监听
- consumer.consumeMessage();
-
// 延时500毫秒之后发送消息
- Thread.sleep(
500
);
- producer.produceMessage(
"Hello, world!"
);
- producer.close();
-
// 延时500毫秒之后停止接受消息
- Thread.sleep(
500
);
- consumer.close();
- }
- }
以上就是我学习ActiveMQ
之后写的一个简单的例子,希望对你有帮助,如果有什么错误还请指正。