核心概念:
(1)使用JNDI查询管理对象ConnectionFactory和Destination
(2)使用管理对象ConnectionFactory建立连接Connection
(3)使用连接Connection建立会话Session
(4)使用会话Session和管理对象Destination创建消息生产者MessagerProducer
(5)使用消息生产者MessagerPriducer发送消息
2.接收消息的客户端使用JMS的过程
(1)使用JNDI查询管理对象ConnectionFactory和Destination
(2)使用管理对象ConnectionFactory建立连接Connection
(3)使用连接Connection建立会话Session
(4)使用会话Session和管理对象Destination创建消息生产者MessagerProducer
(5)使用消息生产者MessagerConsumer接收消息
3. JMS中支持两种事务方式:事务性会话和JTA事务
a)创建事务性会话的代码:qsession=qcon.createQueueSession(true; //在PTP方式下创建事务性会话
Session.AUTO_ACKNOWLEDGE
);
tsession=tcon.createTopicSession(
true; //在Pub/Sub方式下创建事务性会话
Session.AUTO_ACKNOWLEDGE
);
b)JTA事务:JTA支持跨数据源的事务,步骤如下:
(1)创建非事务性会话
QueuesSession session=connection.createQueueSession(
false,Session.AUTO_ACKNOWLEGE);
(2)使用JNDI查询JTA事务引用
Context ctx = new InitialContext();
UserTansaction ux=(UserTansaction)ctx.lookup
(“javax.transaction.UserTansaction”);
(3)开始事务
ux.begin();
(4)执行业务操作
(5)提交或回滚事务
提交事务:ux.commit();
回滚事务:ux.rollback();
服务区端代码
package test.jms;
import javax.jms.*;
import javax.naming.*;
public class Server {
private static Server instance = new Server();
private TopicSession tsession = null;
private Topic topic = null;
private TopicPublisher tpub = null;
private TopicConnectionFactory tcf = null;
private TopicConnection tconn = null;
private Context ctx = null;
private Server() {
init();
}
public static Server getInstance(){
return instance;
}
public void sendMessage(MessageInfo msgInfo){
int tryTimes = 0;
while(true){
try {
if(msgInfo == null){
break;
}
Message msg = tsession.createMessage();
msg.setStringProperty("xxxx", msgInfo.getxxxx());
msg.setStringProperty("xxxx", msgInfo.getxxxx());
msg.setStringProperty("xxxx", msgInfo.getxxxx());
msg.setStringProperty("xxxx", msgInfo.getxxxx());
msg.setStringProperty("xxxx", msgInfo.getxxxx());
msg.setIntProperty("xxxx", msgInfo.getxxxx());
tpub.publish(msg);
break;
}
catch (Exception e) {
if (!init()) {
if (tryTimes < 20) { //默认15分钟可以恢复数据库连接,这里冗余一部分
tryTimes++;
try{
Thread.sleep(60000); //一分种后重试
}
catch(Exception ex){
Logger.log(Logger.DEBUG_TYPE,ex);
}
continue;
}
else{
System.out.println("系统消息机制异常,系统将自动退出!请进行系统恢复!");
SysTool.exit(0);
return;
}
}
}
}
}
private boolean init() {
try {
try{
tpub.close();
}
catch(Exception ex){ }
try{
tsession.close();
}
catch(Exception ex){ }
try{
tconn.close();
}
catch(Exception ex){ }
try{
ctx.close();
}
catch(Exception ex){ }
ctx = new InitialContext();
tcf = (TopicConnectionFactory)ctx.lookup(
"ConnectionFactory");
tconn = tcf.createTopicConnection();
tsession = tconn.createTopicSession(false,TopicSession.AUTO_ACKNOWLEDGE);
topic = (Topic)ctx.lookup("topic/xxxxTopic");
tpub = tsession.createPublisher(topic);
tconn.start();
return true;
}
catch (Exception e) {
Logger.log(Logger.DEBUG_TYPE, e);
return false;
}
}
}
客户端代码
package test;
import java.util.Hashtable;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.Topic;
import javax.jms.TopicConnection;
import javax.jms.TopicConnectionFactory;
import javax.jms.TopicSession;
import javax.jms.TopicSubscriber;
import javax.naming.Context;
import javax.naming.InitialContext;
public class JMSClinet {
public static void main(String[] args) {
while(true){
try {
TopicSession tsession = null;
TopicSubscriber tsub = null;
Hashtable ht = new Hashtable();
ht.put(Context.INITIAL_CONTEXT_FACTORY,
"org.jnp.interfaces.NamingContextFactory");
ht.put(Context.PROVIDER_URL, "ip地址:1099");
ht.put("java.naming.rmi.security.manager", "yes");
ht.put(Context.URL_PKG_PREFIXES, "org.jboss.naming");
Context ctx = new InitialContext(ht);
TopicConnectionFactory factory = (TopicConnectionFactory) ctx
.lookup("ConnectionFactory");
TopicConnection connection = factory.createTopicConnection();
TopicSession session = connection.createTopicSession(false,
Session.AUTO_ACKNOWLEDGE);
Topic topic = (Topic) ctx.lookup("topic/logInAndOutTopic");
tsub = session.createSubscriber(topic);
connection.start();
Message msg = tsub.receive();
String xxxx= msg.getStringProperty("xxxx");
String xxxx= msg.getStringProperty("xxxx");
String xxxx= msg.getStringProperty("xxxx");
String xxxx= msg.getStringProperty("xxxx");
String xxxx= msg.getStringProperty("xxxx");
int xxxx= msg.getIntProperty("xxxx");
connection.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
}
配置文件
<mbean code="org.jboss.mq.server.jmx.Topic"
name="jboss.mq.destination:service=Topic,name=xxxxTopic">
<depends optional-attribute-name="DestinationManager">jboss.mq:service=DestinationManager</depends>
<depends optional-attribute-name="SecurityManager">jboss.mq:service=SecurityManager</depends>
<attribute name="SecurityConf">
<security>
<role name="xxxx" read="true" write="true"/>
<role name="xxxx" read="true" write="true" create="false"/>
<role name="xxxx" read="true" write="true" create="true"/>
</security>
</attribute>
</mbean>