Full Java program for communication with MQ

The original document of this program is from the Internet, but do not know who the author is, in some of the first thanks, I added a personal understanding inside, add comments, so easy to read and understand.

The program realizes the function of sending messages and reading messages, see the send*** and get*** methods. This is only appropriate for testing because the program in the environment needs to have a slight change in this, in the real world it must be in the while (True) {...} An infinite loop in which to invoke the Get method, if there is a value, then the processing operation of the message, if there is no value to continue the loop, there is a wait time in the Get method.

This procedure is quite understandable in its own right:

1, first set up some related environment variables

2. Re-connect the queue Manager

3. Operate the specified queue in the queue manager again

4. Send a message to a specified queue or a message from a specified column

5. Close the queue

MQ in the real world, personally feel that at least there should be two local queues plus a remote queue, because the interaction of the message is bound to be mutual, there is receiving messages, there must be a message. A local queue is used to receive messages that are sent externally, and another local team example is used for transport, which is used for the transmission queue of the remote team example, and sends the message to the local queue of the remote host. In order for a message to be successfully delivered to a remote queue, it is also necessary to configure the channel, typically by specifying the IP address and port of the remote channel, the name of the local transport team example, and the local communication address so that the message can be sent to the remote host.

Java code

/**

* @author fenglb E-mail:[email protected]

* @version creation time: 2009-4-30 04:13:38

* Class Description

*/

Import java.io.IOException;

Import Com.ibm.mq.MQC;

Import com.ibm.mq.MQEnvironment;

Import com.ibm.mq.MQException;

Import com.ibm.mq.MQGetMessageOptions;

Import Com.ibm.mq.MQMessage;

Import com.ibm.mq.MQPutMessageOptions;

Import Com.ibm.mq.MQQueue;

Import Com.ibm.mq.MQQueueManager;

public class messagebymq{

Define the name of the Queue Manager and queue

private static String Qmname;

private static String QName;

private static Mqqueuemanager qMgr;

static{

Setting the Environment:

Mqenvironment contains static variables that control the composition of the environment in the Mqqueuemanager object, and the value of mqenvironment is set to function when the Mqqueuemanager constructor is loaded.

Therefore, the values in the Mqenvironment must be set before the Mqqueuemanager object is established.

Mqenvironment.hostname= "10.24.1.180"; IP address of the MQ server

Mqenvironment.channel= "S_FENGLB"; Server-connected Channels

mqenvironment.ccsid=1381; The encoding used by the server MQ service 1381 represents GBK, 1208 for UTF (Coded Character Set identifier:ccsid)

mqenvironment.port=1414; MQ Port

Qmname = "QM_FENGLB"; Queue Manager name for MQ

QName = "TESTQ"; Name of the MQ remote queue

try {

Define and initialize the Queue Manager object and connect

Mqqueuemanager can be shared by multiple threads, but it is synchronized when it gets information from MQ, and only one thread can communicate with MQ at any time.

QMGR = new Mqqueuemanager (qmname);

} catch (Mqexception e) {

TODO auto-generated Catch block

System.out.println ("Initial make MQ error");

E.printstacktrace ();

}

}

/**

* Send messages to MQ

* @param message

* @return

*/

public static int sendMessage (String message) {

int result=0;

try{

Set the queue properties that will be connected

Note. The MQC interface defines all the constants used by the WebSphere MQ Java programming Interface

(except for completion code constants and error code constants).

Mqoo_input_as_q_def:open the queue to get messages using the queue-defined default.

Mqoo_output:open the queue to put messages.

/* Target is a remote queue, all the Mqoo_input_as_q_def properties cannot be used here */

int openoptions = MQC. Mqoo_input_as_q_def | MQC. Mqoo_output;

/* The following options are available for remote queues and local queues */

int openoptions = MQC. Mqoo_output | MQC. mqoo_fail_if_quiescing;

Connection queue

Mqqueue provides inquire, set, put and get operations for WebSphere MQ queues.

The inquire and set capabilities is inherited from Mqmanagedobject.

/* Reopen it when closed */

if (Qmgr==null | |!qmgr.isconnected ()) {

QMGR = new Mqqueuemanager (qmname);

}

Mqqueue queue = Qmgr.accessqueue (QName, openoptions);

To define a simple message

Mqmessage putmessage = new Mqmessage ();

Putting data into the message buffer

PUTMESSAGE.WRITEUTF (message);

Set the properties of the write message (default property)

Mqputmessageoptions PMO = new Mqputmessageoptions ();

Writing messages to the queue

Queue.put (PUTMESSAGE,PMO);

Queue.close ();

}catch (Mqexception ex) {

System.out.println ("A WebSphere MQ error Occurred:completion Code"

+ Ex.completioncode + "Reason Code" + Ex.reasoncode);

Ex.printstacktrace ();

}catch (IOException ex) {

SYSTEM.OUT.PRINTLN ("An error occurred whilst writing to the message buffer:" + ex);

}catch (Exception ex) {

Ex.printstacktrace ();

}finally{

try {

Qmgr.disconnect ();

} catch (Mqexception e) {

E.printstacktrace ();

}

}

return result;

}

/**

* from the queue to get the message, if there is no message in the queue, an exception will occur, but there is no relationship, there is try ... CATCH, if the method is called by a third-party program, no message is indicated if no return

* Third party can place this method in an infinite loop while (true) {...} , there is no need to set the wait, because there is no message inside the method that waits automatically.

* @return

*/

public static String GetMessage () {

String Message=null;

try{

Set the queue properties that will be connected

Note. The MQC interface defines all the constants used by the WebSphere MQ Java programming Interface

(except for completion code constants and error code constants).

Mqoo_input_as_q_def:open the queue to get messages using the queue-defined default.

Mqoo_output:open the queue to put messages.

int openoptions = MQC. Mqoo_input_as_q_def | MQC. Mqoo_output;

Mqmessage retrieve = new Mqmessage ();

Set the properties of the fetch message (default property)

Set the put message options. (Set placement messages option)

Mqgetmessageoptions GMO = new Mqgetmessageoptions ();

Gmo.options = Gmo.options + MQC. Mqgmo_syncpoint;//get messages under Sync Point control (get messages under sync points)

Gmo.options = Gmo.options + MQC.  mqgmo_wait; Wait if no messages on the queue (wait if no messages are on the queues)

Gmo.options = Gmo.options + MQC. mqgmo_fail_if_quiescing;//fail if Qeue Manager quiescing (fails if Queue Manager pauses)

Gmo.waitinterval = 1000; Sets the time limit for the wait. (Set the wait milliseconds limit)

/* Reopen it when closed */

if (Qmgr==null | |!qmgr.isconnected ()) {

QMGR = new Mqqueuemanager (qmname);

}

Mqqueue queue = Qmgr.accessqueue (QName, openoptions);

Remove a message from the queue

Queue.get (retrieve, GMO);

message = Retrieve.readutf ();

SYSTEM.OUT.PRINTLN ("The message is:" + message);

Queue.close ();

}catch (Mqexception ex) {

System.out.println ("A WebSphere MQ error Occurred:completion Code"

+ Ex.completioncode + "Reason Code" + Ex.reasoncode);

}catch (IOException ex) {

SYSTEM.OUT.PRINTLN ("An error occurred whilst writing to the message buffer:" + ex);

}catch (Exception ex) {

Ex.printstacktrace ();

}finally{

try {

Qmgr.disconnect ();

} catch (Mqexception e) {

E.printstacktrace ();

}

}

return message;

}

public static void Main (String args[]) {

/* The following two methods can be used simultaneously or separately */

SendMessage ("This is a Test");

GetMessage ();

}

}

Full Java program for communication with MQ