Mega Code Archive
Creates and then reads a StreamMessage and a BytesMessage
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/*
* @(#)MessageConversion.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 MessageConversion class consists only of a main method, which creates
* and then reads a StreamMessage and a BytesMessage. It does not send the
* messages.
* <p>
* The program demonstrates type conversions in StreamMessages: you can write
* data as a String and read it as an Int, and vice versa. The program also
* calls clearBody() to clear the message so that it can be rewritten.
* <p>
* The program also shows how to write and read a BytesMessage using data types
* other than a byte array. Conversion between String and other types is
* not supported.
* <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 MessageConversion {
/**
* Main method. Takes no arguments.
*/
public static void main(String[] args) {
ConnectionFactory connectionFactory = null;
Connection connection = null;
Session session = null;
BytesMessage bytesMessage = null;
StreamMessage streamMessage = null;
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 StreamMessage and write values of various data types
* to it.
* Reset the message, then read the values as Strings.
* Values written to a StreamMessage as one data type can be read
* as Strings and vice versa (except for String to char conversion).
*/
streamMessage = session.createStreamMessage();
streamMessage.writeBoolean(false);
streamMessage.writeDouble(123.456789e222);
streamMessage.writeInt(223344);
streamMessage.writeChar('q');
streamMessage.reset();
System.out.println("Reading StreamMessage items of various data"
+ " types as String:");
System.out.println(" Boolean: " + streamMessage.readString());
System.out.println(" Double: " + streamMessage.readString());
System.out.println(" Int: " + streamMessage.readString());
System.out.println(" Char: " + streamMessage.readString());
/*
* Clear the body of the StreamMessage and write several Strings
* to it.
* Reset the message and read the values back as other data types.
*/
streamMessage.clearBody();
streamMessage.writeString("true");
streamMessage.writeString("123.456789e111");
streamMessage.writeString("556677");
// Not char: String to char conversion isn't valid
streamMessage.reset();
System.out.println("Reading StreamMessage String items as other"
+ " data types:");
System.out.println(" Boolean: " + streamMessage.readBoolean());
System.out.println(" Double: " + streamMessage.readDouble());
System.out.println(" Int: " + streamMessage.readInt());
/*
* Create a BytesMessage and write values of various types into
* it.
*/
bytesMessage = session.createBytesMessage();
bytesMessage.writeBoolean(false);
bytesMessage.writeDouble(123.456789e22);
bytesMessage.writeInt(778899);
bytesMessage.writeInt(0x7f800000);
bytesMessage.writeChar('z');
/*
* Reset the message and read the values back. Only limited
* type conversions are possible.
*/
bytesMessage.reset();
System.out.println("Reading BytesMessages of various types:");
System.out.println(" Boolean: " + bytesMessage.readBoolean());
System.out.println(" Double: " + bytesMessage.readDouble());
System.out.println(" Int: " + bytesMessage.readInt());
System.out.println(" Float: " + bytesMessage.readFloat());
System.out.println(" Char: " + bytesMessage.readChar());
} catch (JMSException e) {
System.out.println("JMS Exception occurred: " + e.toString());
exitResult = 1;
} finally {
if (connection != null) {
try {
connection.close();
} catch (JMSException e) {
exitResult = 1;
}
}
}
SampleUtilities.exit(exitResult);
}
}
jms.zip( 65 k)
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