Creates a Producer and a Consumer objects (Producer and Consumer classes are defined in this file)
/*
* @(#)XMLMessageExample.java 1.10 04/01/05
*
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import java.io.*;
import javax.jms.*;
import org.w3c.dom.Document;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* The XMLMessageExample class consists a main method which creates a
* Producer and a Consumer objects (Producer and Consumer classes are defined
* in this file). The Producer reads a XML file to a StreamMessage and sends
* it to a queue. The Consumer receives the StreamMessage and read the XML
* document from it then using JAXP API to parse the XML document into a
* DOM object.
* <p>
* The command line options for running this program include (in order)
* a Sun Java(tm) System Message Queue Queue name
* an XML filename (sample.xml and its DTD file - sample.dtd are provided)
* an optional system ID URL (for use by the XML parser to resolve any
* external entity URI)
*
*/
public class XMLMessageExample {
/**
* Main method.
*
* @param args the queue used by the example
* the xml filename used by the example
* and optionally, the system identifier
*/
public static void main(String[] args) {
if ( (args.length < 2) || (args.length > 3) ) {
System.out.println("Usage: java XMLMessageExample "
+ "<queue_name> <xml_filename> [<systemid_url>]");
System.exit(1);
}
String queueName = new String(args[0]);
System.out.println("Queue name is " + queueName);
Producer producer = null;
Consumer consumer = null;
try {
producer = new Producer(queueName);
consumer = new Consumer(queueName);
producer.send(args[1]);
consumer.receive(args.length > 2 ? args[2]:null);
}
catch (Exception e) {
System.out.println("Exception occurred : " + e.toString());
e.printStackTrace();
}
finally {
if (producer != null) producer.close();
if (consumer != null) consumer.close();
}
}
}
class Producer {
ConnectionFactory connectionFactory = null;
Connection connection = null;
Session session = null;
Queue queue = null;
MessageProducer msgProducer = null;
public Producer(String queueName) throws Exception {
try {
connectionFactory = SampleUtilities.getConnectionFactory();
connection = connectionFactory.createConnection();
session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
queue = SampleUtilities.getQueue(queueName, session);
msgProducer = session.createProducer(queue);
}
catch (Exception e) {
close();
throw e;
}
}
public void close() {
if (connection != null) {
try {
connection.close();
connection = null;
} catch (JMSException e) {}
}
}
public void send(String xmlfile) throws Exception {
StreamMessage streamMessage = null;
/*
* Create input stream from the xml file
* Read bytes from the input stream into a buffer
* and construct a StreamMessage
* Send the message
*/
File f = new File(xmlfile);
int length = (int)f.length();
FileInputStream inStream = new FileInputStream(f);
byte[] buf = new byte[length];
inStream.read(buf);
inStream.close();
streamMessage = session.createStreamMessage();
streamMessage.writeObject(buf);
System.out.println("Write " + length + " bytes into message");
/*
* Set a property so that the consumer can check to know
* this message has a XML document body. This is helpful
* if there are other messages in the queue.
*/
streamMessage.setBooleanProperty("MyXMLMessage", true);
msgProducer.send(streamMessage);
}
}
class Consumer {
DocumentBuilder docBuilder = null;
ConnectionFactory connectionFactory = null;
Connection connection = null;
Session session = null;
Queue queue = null;
MessageConsumer msgConsumer = null;
public Consumer(String queueName) throws Exception {
try {
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
docBuilder = docBuilderFactory.newDocumentBuilder();
connectionFactory = SampleUtilities.getConnectionFactory();
connection = connectionFactory.createConnection();
session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
queue = SampleUtilities.getQueue(queueName, session);
msgConsumer = session.createConsumer(queue);
connection.start();
}
catch (Exception e) {
close();
throw e;
}
}
public void close() {
if (connection != null) {
try {
connection.close();
connection = null;
} catch (JMSException ee) {}
}
}
public void receive(String systemid) throws Exception {
StreamMessage streamMessage = null;
Message message = null;
/*
* Receive the message from the queue
* Process the message
*/
while(true) {
message = msgConsumer.receive();
if (!(message instanceof StreamMessage)) {
//not our XML message
continue;
}
streamMessage = (StreamMessage)message;
try {
if (!streamMessage.getBooleanProperty("MyXMLMessage")) {
//not our XML message
continue;
}
} catch (NullPointerException e) { //the property not exist
//not our XML message
continue;
}
//got our XML message
byte[] bytes = (byte[])streamMessage.readObject();
System.out.println("Read " + bytes.length + " bytes from message");
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
InputSource is =new InputSource(bais);
if (systemid != null) {
is.setSystemId(systemid);
}
parse(is);
break;
}
}
private void parse(InputSource is) throws Exception {
try {
Document doc = docBuilder.parse(is);
// normalize text representation
doc.getDocumentElement().normalize();
System.out.println ("Root element of the doc is " +
doc.getDocumentElement().getNodeName());
} catch (SAXParseException e) {
System.out.println ("** Parsing error"
+ ", line " + e.getLineNumber()
+ ", uri " + e.getSystemId());
System.out.println(" " + e.getMessage());
Exception x = e.getException();
((x == null) ? e : x).printStackTrace();
throw e;
} catch (SAXException e) {
Exception x = e.getException();
((x == null) ? e : x).printStackTrace();
throw e;
}
}
}
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