前面三篇，第一篇讲了安装IBM MQ时遇到的一些问题。第二篇讲了点对点模式的调用。第三篇讲了发布订阅模式。本篇说一下监听模式。
监听模式只是在消费者端监听就可以了。对于消息发布者，代码不用做改动。改动的代码用<span>标签标注（代码不能修改颜色？）：
package test2;
// SCCSID "@(#) MQMBID sn=p000-L120604 su=_H-IvIK4nEeGko6IWl3MDhA pn=MQJavaSamples/jms/JmsConsumer.java"
/*
* <copyright
* notice="lm-source-program"
* pids="5724-H72,5655-R36,5655-L82,5724-L26,"
* years="2008,2012"
* crc="39457954" >
* Licensed Materials - Property of IBM
*
* 5724-H72,5655-R36,5655-L82,5724-L26,
*
* (C) Copyright IBM Corp. 2008, 2012 All Rights Reserved.
*
* US Government Users Restricted Rights - Use, duplication or
* disclosure restricted by GSA ADP Schedule Contract with
* IBM Corp.
* </copyright>
*/
import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;
import javax.jms.TextMessage;
import com.ibm.msg.client.jms.JmsConnectionFactory;
import com.ibm.msg.client.jms.JmsFactoryFactory;
import com.ibm.msg.client.wmq.WMQConstants;
/**
* A JMS consumer (receiver or subscriber) application that receives a message from the named
* destination (queue or topic).
*
* Tip: A subscriber application must be started before the publisher application.
*
* Notes:
*
* API type: IBM JMS API (v1.1, unified domain)
*
* Messaging domain: Point-to-point or Publish-Subscribe
*
* Provider type: WebSphere MQ
*
* Connection mode: Client connection
*
* JNDI in use: No
*
* Usage:
*
* JmsConsumer -m queueManagerName -d destinationName [-h host -p port -l channel]
*
* for example:
*
* JmsConsumer -m QM1 -d Q1
*
* JmsConsumer -m QM1 -d topic://foo -h localhost -p 1414
*/
public class JmsConsumer {
private static String host = "localhost";
private static int port = 1414;
private static String channel = "SYSTEM.DEF.SVRCONN";
private static String queueManagerName = null;
private static String destinationName = null;
private static boolean isTopic = true;
private static int timeout = 15000; // in ms or 15 seconds
// System exit status value (assume unset value to be 1)
private static int status = 1;
/**
* Main method
*
* @param args
*/
public static void main(String[] args) {
// Parse the arguments
args = new String[]{"-m","QMTest", "-d","testQueue"};
parseArgs(args);
// Variables
Connection connection = null;
Session session = null;
Destination destination = null;
MessageConsumer consumer = null;
try {
// Create a connection factory
JmsFactoryFactory ff = JmsFactoryFactory.getInstance(WMQConstants.WMQ_PROVIDER);
JmsConnectionFactory cf = ff.createConnectionFactory();
// Set the properties
cf.setStringProperty(WMQConstants.WMQ_HOST_NAME, host);
cf.setIntProperty(WMQConstants.WMQ_PORT, port);
cf.setStringProperty(WMQConstants.WMQ_CHANNEL, channel);
cf.setIntProperty(WMQConstants.WMQ_CONNECTION_MODE, WMQConstants.WMQ_CM_CLIENT);
cf.setStringProperty(WMQConstants.WMQ_QUEUE_MANAGER, queueManagerName);
// Create JMS objects
connection = cf.createConnection();
session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
if (isTopic) {
destination = session.createTopic(destinationName);
}
else {
destination = session.createQueue(destinationName);
}
consumer = session.createConsumer(destination);
// Start the connection
connection.start();
consumer.setMessageListener(new MessageListener(){
public void onMessage(Message m) {
//如果想收到完整的消息“
System.out.println(m);
//如果想收到消息内容，执行下面的代码
TextMessage textMsg = (TextMessage) m;
try {
System.out.println(textMsg.getText());
} catch (JMSException e) {
e.printStackTrace();
}
}
});
// And, receive the message
//在指定的超市时间内接收下一条消息
// Message message = consumer.receive(timeout);
// if (message != null) {
// System.err.println("Received message:\n" + message);
//// System.out.println("Received message:\n" + message);
// }
// else {
// System.out.println("No message received!\n");
// recordFailure(null);
// }
recordSuccess();
}
catch (JMSException jmsex) {
recordFailure(jmsex);
}
finally {
if (consumer != null) {
try {
consumer.close();
}
catch (JMSException jmsex) {
System.out.println("Consumer could not be closed.");
recordFailure(jmsex);
}
}
if (session != null) {
try {
session.close();
}
catch (JMSException jmsex) {
System.out.println("Session could not be closed.");
recordFailure(jmsex);
}
}
if (connection != null) {
try {
connection.close();
}
catch (JMSException jmsex) {
System.out.println("Connection could not be closed.");
recordFailure(jmsex);
}
}
}
System.exit(status);
return;
} // end main()
/**
* Process a JMSException and any associated inner exceptions.
*
* @param jmsex
*/
private static void processJMSException(JMSException jmsex) {
System.out.println(jmsex);
Throwable innerException = jmsex.getLinkedException();
if (innerException != null) {
System.out.println("Inner exception(s):");
}
while (innerException != null) {
System.out.println(innerException);
innerException = innerException.getCause();
}
return;
}
/**
* Record this run as successful.
*/
private static void recordSuccess() {
System.out.println("SUCCESS");
status = 0;
return;
}
/**
* Record this run as failure.
*
* @param ex
*/
private static void recordFailure(Exception ex) {
if (ex != null) {
if (ex instanceof JMSException) {
processJMSException((JMSException) ex);
}
else {
System.out.println(ex);
}
}
System.out.println("FAILURE");
status = -1;
return;
}
/**
* Parse user supplied arguments.
*
* @param args
*/
private static void parseArgs(String[] args) {
try {
int length = args.length;
if (length == 0) {
throw new IllegalArgumentException("No arguments! Mandatory arguments must be specified.");
}
if ((length % 2) != 0) {
throw new IllegalArgumentException("Incorrect number of arguments!");
}
int i = 0;
while (i < length) {
if ((args[i]).charAt(0) != '-') {
throw new IllegalArgumentException("Expected a '-' character next: " + args[i]);
}
char opt = (args[i]).toLowerCase().charAt(1);
switch (opt) {
case 'h' :
host = args[++i];
break;
case 'p' :
port = Integer.parseInt(args[++i]);
break;
case 'l' :
channel = args[++i];
break;
case 'm' :
queueManagerName = args[++i];
break;
case 'd' :
destinationName = args[++i];
break;
default : {
throw new IllegalArgumentException("Unknown argument: " + opt);
}
}
++i;
}
if (queueManagerName == null) {
throw new IllegalArgumentException("A queueManager name must be specified.");
}
if (destinationName == null) {
throw new IllegalArgumentException("A destination name must be specified.");
}
// Whether the destination is a queue or a topic. Apply a simple check.
if (destinationName.startsWith("topic://")) {
isTopic = true;
}
else {
// Otherwise, let's assume it is a queue.
isTopic = false;
}
}
catch (Exception e) {
System.out.println(e.getMessage());
printUsage();
System.exit(-1);
}
return;
}
/**
* Display usage help.
*/
private static void printUsage() {
System.out.println("\nUsage:");
System.out
.println("JmsConsumer -m queueManagerName -d destinationName [-h host -p port -l channel]");
return;
}
} // end class