Java implements the receive queue file function in conjunction with WebSphere MQ

Let's start with a brief introduction to websphere mq and installation usage

Websphere mq  : for the transmission of information has a cross-platform function.

1 install websphere mq and start

2 websphere mq establishes the queue Manager (e.g. MQSI_SAMPLE_QM)

3 establish the queue type by selecting the Local type (e.g. Lq ; )

4   Establish channels type select Server Connection (such as BridgeChannel)

Next, let's look at the example code:

MQFileReceiver.java

package com.mq.dpca.file;
 
import java.io.File;
import java.io.FileOutputStream;
 
import com.ibm.mq.MQEnvironment;
import com.ibm.mq.MQException;
import com.ibm.mq.MQGetMessageOptions;
import com.ibm.mq.MQMessage;
import com.ibm.mq.MQQueue;
import com.ibm.mq.MQQueueManager;
import com.ibm.mq.constants.MQConstants;
import com.mq.dpca.msg.MQConfig;
import com.mq.dpca.util.ReadCmdLine;
import com.mq.dpca.util.RenameUtil;
 

public class MQFileReceiver {
  private MQQueueManager qmgr; //Connect to the queue manager
 
  private MQQueue inQueue; //A transmission queue
 
  private String queueName = ""; //The name of the queue
 
  private String host = ""; //
 
  private int port = 1414; //The port number of the listener
 
  private String channel = ""; //The name of the channel
 
  private String qmgrName = ""; //Queue manager
 
  private MQMessage inMsg; //Creating message buffers
 
  private MQGetMessageOptions gmo; //Set the get message option
 
  private static String fileName = null; //Receive the message on the queue and store it in a file
 
  private int ccsid = 0;
 
  private static String file_dir = null;
 
  
  public static void main(String args[]) {
    MQFileReceiver mfs = new MQFileReceiver();
    //Initialize connection
    mfs.initproperty();
    //Receive the file
    mfs.runGoupReceiver();
    //Gets the shell script name
//   String shellname = MQConfig.getValueByKey(fileName);
//   if(shellname!=null&&!"".equals(shellname)){
//     // call shell
//     ReadCmdLine.callShell(shellname);
//   }else{
//     System.out.println("have no shell name,Only receive files.");
//   }
 
  }
 
  public void runGoupReceiver() {
    try {
      init();
      getGroupMessages();
      qmgr.commit();
      System.out.println("n Messages successfully Receive ");
    } catch (MQException mqe) {
      mqe.printStackTrace();
      try {
        System.out.println("n Backing out Transaction ");
        qmgr.backout();
        System.exit(2);
      } catch (Exception e) {
        e.printStackTrace();
        System.exit(2);
      }
    } catch (Exception e) {
      e.printStackTrace();
      System.exit(2);
    }
  }
 
  
  private void init() throws Exception {
    
    MQEnvironment.hostname = host;
    MQEnvironment.channel = channel;
    MQEnvironment.port = port;
 
    
    qmgr = new MQQueueManager(qmgrName);
 
    
    int opnOptn = MQConstants.MQOO_INPUT_AS_Q_DEF
        | MQConstants.MQOO_FAIL_IF_QUIESCING;
 
    
    inQueue = qmgr.accessQueue(queueName, opnOptn, null, null, null);
  }
 
  
  public void getGroupMessages() {
    
    gmo = new MQGetMessageOptions();
    gmo.options = MQConstants.MQGMO_FAIL_IF_QUIESCING;
    gmo.options = gmo.options + MQConstants.MQGMO_SYNCPOINT;
    
    gmo.options = gmo.options + MQConstants.MQGMO_WAIT;
    
    gmo.waitInterval = 5000;
    
    gmo.options = gmo.options + MQConstants.MQGMO_ALL_MSGS_AVAILABLE;
    
    gmo.options = gmo.options + MQConstants.MQGMO_LOGICAL_ORDER;
    gmo.matchOptions = MQConstants.MQMO_MATCH_GROUP_ID;
    
    inMsg = new MQMessage();
    try {
      FileOutputStream fos = null;
      
      while (true) {
        try {
          inQueue.get(inMsg, gmo);
          if (fos == null) {
            try {
              fileName = inMsg.getStringProperty("fileName");
              String fileName_full = null;
              fileName_full = file_dir + RenameUtil.rename(fileName);
              fos = new FileOutputStream(new File(fileName_full));
              int msgLength = inMsg.getMessageLength();
              byte[] buffer = new byte[msgLength];
              inMsg.readFully(buffer);
              fos.write(buffer, 0, msgLength);
              
              char x = gmo.groupStatus;
              if (x == MQConstants.MQGS_LAST_MSG_IN_GROUP) {
                System.out.println("Last Msg in Group");
                break;
              }
              inMsg.clearMessage();
 
            } catch (Exception e) {
              System.out
                  .println("Receiver the message without property,do nothing!");
              inMsg.clearMessage();
            }
          } else {
            int msgLength = inMsg.getMessageLength();
            byte[] buffer = new byte[msgLength];
            inMsg.readFully(buffer);
            fos.write(buffer, 0, msgLength);
            
            char x = gmo.groupStatus;
            if (x == MQConstants.MQGS_LAST_MSG_IN_GROUP) {
              System.out.println("Last Msg in Group");
              break;
            }
            inMsg.clearMessage();
          }
        } catch (Exception e) {
          char x = gmo.groupStatus;
          if (x == MQConstants.MQGS_LAST_MSG_IN_GROUP) {
            System.out.println("Last Msg in Group");
          }
          break;
        }
      }
      if (fos != null)
        fos.close();
    } catch (Exception e) {
      System.out.println(e.getMessage());
    }
  }
 
  public void initproperty() {
    MQConfig config = new MQConfig().getInstance();
    if (config.getMQ_MANAGER() != null) {
      qmgrName = config.getMQ_MANAGER();
      queueName = config.getMQ_QUEUE_NAME();
      channel = config.getMQ_CHANNEL();
      host = config.getMQ_HOST_NAME();
      port = Integer.valueOf(config.getMQ_PROT());
      ccsid = Integer.valueOf(config.getMQ_CCSID());
      file_dir = config.getFILE_DIR();
    }
  }
}