Creates and reads messages in all supported JMS message formats: BytesMessage, TextMessage, MapMessage, StreamMessage, and ObjectMessage : Java Message Service JMS « J2EE « Java






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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