Creates and reads messages in all supported JMS message formats: BytesMessage, TextMessage, MapMessage, StreamMessage, and ObjectMessage
/*
* @(#)MessageFormats.java 1.3 02/05/02
*
* Copyright (c) 2000-2002 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
import javax.jms.*;
/**
* The MessageFormats class consists only of a main method, which creates and
* then reads messages in all supported JMS message formats: BytesMessage,
* TextMessage, MapMessage, StreamMessage, and ObjectMessage. It does not send
* the messages.
* <p>
* Before it can read a BytesMessage or StreamMessage that has not been sent,
* the program must call reset() to put the message body in read-only mode
* and reposition the stream.
*
* @author Kim Haase
* @version 1.4, 08/09/00
*/
public class MessageFormats {
/**
* Main method. Takes no arguments.
*/
public static void main(String[] args) {
ConnectionFactory connectionFactory = null;
Connection connection = null;
Session session = null;
BytesMessage bytesMessage = null;
byte[] byteData = {-128, 127, -1, 0, 1, -64, 64};
int length = 0;
byte[] inByteData = new byte[7];
TextMessage textMessage = null;
String msgText = "This is a text message.";
MapMessage mapMessage = null;
StreamMessage streamMessage = null;
ObjectMessage objectMessage = null;
String object = "A String is an object.";
int exitResult = 0;
try {
connectionFactory =
SampleUtilities.getConnectionFactory();
connection =
connectionFactory.createConnection();
session = connection.createSession(false,
Session.AUTO_ACKNOWLEDGE);
} catch (Exception e) {
System.out.println("Connection problem: " + e.toString());
if (connection != null) {
try {
connection.close();
} catch (JMSException ee) {}
}
System.exit(1);
}
try {
/*
* Create a BytesMessage, then write it from an array of
* bytes (signed 8-bit integers).
* Reset the message for reading, then read the bytes into a
* second array.
* A BytesMessage is an undifferentiated stream of bytes that can
* be read in various formats.
*/
bytesMessage = session.createBytesMessage();
bytesMessage.writeBytes(byteData);
bytesMessage.reset();
length = bytesMessage.readBytes(inByteData);
System.out.println("Reading BytesMessage " + length
+ " bytes long:");
for (int i = 0; i < length; i++) {
System.out.print(" " + inByteData[i]);
}
System.out.println();
/*
* Create, write, and display the contents of a TextMessage.
* A TextMessage contains a String of any length.
*/
textMessage = session.createTextMessage();
textMessage.setText(msgText);
System.out.println("Reading TextMessage:");
System.out.println(" " + textMessage.getText());
/*
* Create and write a MapMessage, then display its contents in
* a different order.
* A MapMessage contains a series of name/value pairs.
* The name is a string; the value can be of various types.
* The receiving program can read any or all of the values,
* in any order.
*/
mapMessage = session.createMapMessage();
mapMessage.setString("Message type", "Map");
mapMessage.setInt("An Integer", 3456);
mapMessage.setDouble("A Double", 1.23456789);
System.out.println("Reading MapMessage in a different order"
+ " from the way it was generated:");
System.out.println(" Type: "
+ mapMessage.getString("Message type"));
System.out.println(" Double: "
+ mapMessage.getDouble("A Double"));
System.out.println(" Integer: "
+ mapMessage.getInt("An Integer"));
/*
* Create and write a StreamMessage.
* Reset the message for reading and display the values.
* A StreamMessage can also contain values of various types.
* They must be read in the same order in which they were
* written.
*/
streamMessage = session.createStreamMessage();
streamMessage.writeString("Stream message");
streamMessage.writeDouble(123.456789e222);
streamMessage.writeInt(223344);
streamMessage.reset();
System.out.println("Reading StreamMessage in the order"
+ " in which it was generated:");
System.out.println(" String: "
+ streamMessage.readString());
System.out.println(" Double: "
+ streamMessage.readDouble());
System.out.println(" Integer: "
+ streamMessage.readInt());
/*
* Create an ObjectMessage from a String object, then
* display its contents.
* An ObjectMessage can contain any Java object. This example
* uses a String for the sake of simplicity. The program that
* reads the object casts it to the appropriate type.
*/
objectMessage = session.createObjectMessage();
objectMessage.setObject(object);
System.out.println("Reading ObjectMessage:");
System.out.println(" " + (String) objectMessage.getObject());
} catch (JMSException e) {
System.out.println("Exception occurred: " + e.toString());
exitResult = 1;
} finally {
if (connection != null) {
try {
connection.close();
} catch (JMSException e) {
exitResult = 1;
}
}
}
SampleUtilities.exit(exitResult);
}
}
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