Printing the content of a message using IBM MQ classes for Java

This example uses MQHeaderList to print out the content of a message, including its headers.

The output contains a view of all the header contents as well as the body of the message. The MQHeaderList class decodes all the headers in one go, whereas the MQHeaderIterator steps through them one at a time under application control. We might use this technique to provide a simple debugging tool when writing WebSphere MQ applications.

import com.ibm.mq.MQMessage;
import com.ibm.mq.headers.MQHeaderList;
...
MQMessage message = ... // Message received from a queue.

System.out.println (new MQHeaderList (message, true));

This example also prints out the message descriptor fields, using the MQMD class. The copyFrom() method of the com.ibm.mq.headers.MQMD class populates the header object from the message descriptor fields of the MQMessage rather than by reading the message body.

import com.ibm.mq.MQMessage;
import com.ibm.mq.headers.MQMD;
import com.ibm.mq.headers.MQHeaderList;
...
MQMessage message = ...
MQMD md = new MQMD ();
...
md.copyFrom (message);
System.out.println (md + "\n" + new MQHeaderList (message, true));

Parent topic: Handling IBM MQ message headers with IBM MQ classes for Java