Java 如何按条件从队列中删除消息？
我从IBM MQ收到一条消息。如何按条件从队列中删除消息 我试图在光标下设置gmo.options=CMQC.MQGMO_MSG_；但这对我没有帮助Java 如何按条件从队列中删除消息？,java,ibm-mq,Java,Ibm Mq,我从IBM MQ收到一条消息。如何按条件从队列中删除消息 我试图在光标下设置gmo.options=CMQC.MQGMO_MSG_；但这对我没有帮助 MQQueue queue = queueManager.accessQueue(e.getIbmQueue().trim(), CMQC.MQOO_INPUT_SHARED | CMQC.MQOO_FAIL_IF_QUIESCING | CMQC.MQOO_INQUIRE, null, null, null); MQGetMessageOpti
MQQueue queue = queueManager.accessQueue(e.getIbmQueue().trim(), CMQC.MQOO_INPUT_SHARED | CMQC.MQOO_FAIL_IF_QUIESCING | CMQC.MQOO_INQUIRE, null, null, null);
MQGetMessageOptions gmo = new MQGetMessageOptions();
gmo.options = MQGMO_ALL_MSGS_AVAILABLE | MQGMO_WAIT | MQGMO_PROPERTIES_AS_Q_DEF | MQGMO_FAIL_IF_QUIESCING | MQOO_INPUT_AS_Q_DEF | MQGMO_SYNCPOINT;
gmo.matchOptions = MQMO_MATCH_CORREL_ID;
gmo.waitInterval = 50000;
byte[] body = null;
while (true) {
try {
queue.get(msg, gmo);
body = new byte[msg.getMessageLength()];
String businessIdFromIbm = msg.getStringProperty("usr.uuid");
if (businessIdFromIbm.equals("123")) {
//delete message
}
msg.clearMessage();
}
上面示例中的queue.get调用是一个破坏性的get-在该调用期间，消息将从队列中逻辑删除 您正在使用同步点，因此需要调用queuemanager.commit（）来完成工作单元（或者，如果调用queuemanager.disconnect（），同步点将自动提交） 只有当您打开队列进行浏览（CMQC.MQOO_browse）并对队列发出至少一次浏览，以便应用程序在其浏览光标下有一条有效消息时，_光标下的MQGMO_MSG_才有效 如果要浏览邮件，然后使用第二个队列将其删除。get要删除浏览光标下的邮件，您的第一个queue.get需要在gmo.options上指定MQGMO_browse_first或MQGMO_browse_NEXT；然后，第二个queue.get需要在\u游标下提供MQGMO\u MSG\u作为匹配选项，而不设置任何浏览选项，以便以破坏性方式删除已浏览的消息
MQQueue queue = queueManager.accessQueue(e.getIbmQueue().trim(), CMQC.MQOO_INPUT_SHARED | CMQC.MQOO_BROWSE | CMQC.MQOO_FAIL_IF_QUIESCING | CMQC.MQOO_INQUIRE, null, null, null);
MQGetMessageOptions gmo = new MQGetMessageOptions();
gmo.options = CMQC.MQGMO_ALL_MSGS_AVAILABLE | CMQC.MQGMO_WAIT | CMQC.MQGMO_PROPERTIES_AS_Q_DEF | CMQC.MQGMO_FAIL_IF_QUIESCING | CMQC.MQGMO_BROWSE_NEXT;
gmo.matchOptions = MQMO_MATCH_CORREL_ID;
gmo.waitInterval = 50000;
byte[] body = null;
while (true) {
try {
queue.get(msg, gmo);
body = new byte[msg.getMessageLength()];
String businessIdFromIbm = msg.getStringProperty("usr.uuid");
if (businessIdFromIbm.equals("123")) {
//delete message
MQGetMessageOptions gmo2 = new MQGetMessageOptions();
gmo2.options = CMQC.MQGMO_MSG_UNDER_CURSOR | CMQC.MQGMO_FAIL_IF_QUIESCING | CMQC.MQGMO_SYNCPOINT;
queue.get(msg, gmo2);
// Be prepared to handle the case where the message has been removed by another application (or expired) and so you receive MQRC 2033
queueManager.commit();
}
msg.clearMessage();
}
另一种方法（如果这是一个问题，则需要较少的对队列管理器的调用）是将JMS API用于MQ，并在usr.uuid上使用选择器，这样只有设置为123的消息才会返回到应用程序。请参见上面示例中的queue.get调用是一个破坏性的get-在该调用期间，消息将从队列中逻辑删除 您正在使用同步点，因此需要调用queuemanager.commit（）来完成工作单元（或者，如果调用queuemanager.disconnect（），同步点将自动提交） 只有当您打开队列进行浏览（CMQC.MQOO_browse）并对队列发出至少一次浏览，以便应用程序在其浏览光标下有一条有效消息时，_光标下的MQGMO_MSG_才有效 如果要浏览邮件，然后使用第二个队列将其删除。get要删除浏览光标下的邮件，您的第一个queue.get需要在gmo.options上指定MQGMO_browse_first或MQGMO_browse_NEXT；然后，第二个queue.get需要在\u游标下提供MQGMO\u MSG\u作为匹配选项，而不设置任何浏览选项，以便以破坏性方式删除已浏览的消息
MQQueue queue = queueManager.accessQueue(e.getIbmQueue().trim(), CMQC.MQOO_INPUT_SHARED | CMQC.MQOO_BROWSE | CMQC.MQOO_FAIL_IF_QUIESCING | CMQC.MQOO_INQUIRE, null, null, null);
MQGetMessageOptions gmo = new MQGetMessageOptions();
gmo.options = CMQC.MQGMO_ALL_MSGS_AVAILABLE | CMQC.MQGMO_WAIT | CMQC.MQGMO_PROPERTIES_AS_Q_DEF | CMQC.MQGMO_FAIL_IF_QUIESCING | CMQC.MQGMO_BROWSE_NEXT;
gmo.matchOptions = MQMO_MATCH_CORREL_ID;
gmo.waitInterval = 50000;
byte[] body = null;
while (true) {
try {
queue.get(msg, gmo);
body = new byte[msg.getMessageLength()];
String businessIdFromIbm = msg.getStringProperty("usr.uuid");
if (businessIdFromIbm.equals("123")) {
//delete message
MQGetMessageOptions gmo2 = new MQGetMessageOptions();
gmo2.options = CMQC.MQGMO_MSG_UNDER_CURSOR | CMQC.MQGMO_FAIL_IF_QUIESCING | CMQC.MQGMO_SYNCPOINT;
queue.get(msg, gmo2);
// Be prepared to handle the case where the message has been removed by another application (or expired) and so you receive MQRC 2033
queueManager.commit();
}
msg.clearMessage();
}
另一种方法（如果这是一个问题，则需要较少的对队列管理器的调用）是将JMS API用于MQ，并在usr.uuid上使用选择器，这样只有设置为123的消息才会返回到应用程序。请参见您可以阅读我的完整博客帖子。这是它的读者文摘版本 对于基于MQ/JMS消息的过滤存在误解。有些人认为IBM MQ队列管理器为JMS应用程序做了一些特殊的事情，而不是为普通Java或C/C++/C#/COBOL应用程序做的。这不是真的。有关更多信息，请阅读知识中心的第一段。注意：对于C/C++/C#/COBOL应用程序，它们可以使用MQOD结构中的SelectionString来执行消息选择 我已经为POJO MQ应用程序创建了一个消息选择器类 下面是MQTest12MS的一个片段，它向您展示了如何使用MessageSelector类
ms = new MessageSelector(qMgr);
ms.openQueue(inputQName);
ms.setFilter("SomeNum", MessageSelector.Conditions.GREATER_THAN_EQUAL, 123);
while (true)
{
receiveMsg = ms.getMessage(startAtBeginning);
// got the message, now go and do something with it.
// set flag to continue rather than restart at the beginning.
startAtBeginning = false;
}
ms.closeQueue();
import java.io.IOException;
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.CMQC;
/**
* Class Name
* MessageSelector
*
* Description
* This java class will retrieve messages from a queue based on a filter.
*
* @author Roger Lacroix
* @version 1.0.0
* @license Apache 2 License
*/
public class MessageSelector
{
public enum Conditions
{
EQUAL, NOT_EQUAL, LESS_THAN, LESS_THAN_EQUAL, GREATER_THAN, GREATER_THAN_EQUAL;
}
private MQQueueManager qMgr = null;
private MQQueue inQ = null;
private String filterName = null;
private Conditions filterCondition;
private Object filterValue = null;
/**
* The constructor
* @param qMgr - must have a valid/active connection to the queue manager
*/
public MessageSelector(MQQueueManager qMgr)
{
super();
this.qMgr = qMgr;
}
/**
* Open the queue for both browsing and destructive gets.
* @param qName
* @throws MQException
*/
public void openQueue(String qName) throws MQException
{
inQ = qMgr.accessQueue(qName, CMQC.MQOO_INQUIRE + CMQC.MQOO_BROWSE + CMQC.MQOO_FAIL_IF_QUIESCING + CMQC.MQOO_INPUT_SHARED);
}
/**
* Close the queue.
* @throws MQException
*/
public void closeQueue() throws MQException
{
if (inQ != null)
inQ.close();
}
/**
* Set the filter name, condition and value.
* @param name
* @param condition
* @param value
* @throws IllegalArgumentException
*/
public void setFilter(String name, Conditions condition, Object value) throws IllegalArgumentException
{
if (name == null)
throw new IllegalArgumentException("Filter name cannot be null.");
else if ("".equals(name))
throw new IllegalArgumentException("Filter name cannot be blank.");
else if (value == null)
throw new IllegalArgumentException("Filter value cannot be null.");
if ( (value instanceof String) || (value instanceof Boolean) ||
(value instanceof Byte) || (value instanceof Byte[]) )
{
if ( (Conditions.EQUAL != condition) && (Conditions.NOT_EQUAL != condition) )
{
throw new IllegalArgumentException("Filter condition can only be EQUAL or NOT_EQUAL.");
}
}
else if ( (value instanceof Integer) || (value instanceof Long) ||
(value instanceof Double) || (value instanceof Float) )
{
if ( (Conditions.EQUAL != condition) && (Conditions.NOT_EQUAL != condition) &&
(Conditions.LESS_THAN != condition) && (Conditions.LESS_THAN_EQUAL != condition) &&
(Conditions.GREATER_THAN != condition) && (Conditions.GREATER_THAN_EQUAL != condition) )
{
throw new IllegalArgumentException("Filter condition must be one of the following: EQUAL, NOT_EQUAL, LESS_THAN, LESS_THAN_EQUAL, GREATER_THAN, GREATER_THAN_EQUAL.");
}
}
else
{
throw new IllegalArgumentException("Unknown Object type for Filter value.");
}
/**
* Pass the checks, save the values
*/
this.filterName = name;
this.filterCondition = condition;
this.filterValue = value;
}
/**
* Retrieve the next matching message from the queue.
* @param reset - Start over from the beginning of the queue.
* @return
* @throws MQException
* @throws IOException
*/
public MQMessage getMessage(boolean reset) throws MQException, IOException
{
MQGetMessageOptions gmo = new MQGetMessageOptions();
if (reset)
gmo.options = CMQC.MQGMO_BROWSE_FIRST + CMQC.MQGMO_NO_WAIT + CMQC.MQGMO_FAIL_IF_QUIESCING;
else
gmo.options = CMQC.MQGMO_BROWSE_NEXT + CMQC.MQGMO_NO_WAIT + CMQC.MQGMO_FAIL_IF_QUIESCING;
MQMessage getMsg = null;
while (true)
{
getMsg = new MQMessage();
inQ.get(getMsg, gmo);
if (performConditionalTest(getMsg))
{
deleteMessage();
break;
}
gmo.options = CMQC.MQGMO_BROWSE_NEXT + CMQC.MQGMO_NO_WAIT + CMQC.MQGMO_FAIL_IF_QUIESCING;
}
return getMsg;
}
/**
* Handle the conditional testing of the value.
* @param getMsg
* @return true/false
*/
private boolean performConditionalTest(MQMessage getMsg)
{
boolean flag = false;
try
{
if (filterValue instanceof String)
{
String value = getMsg.getStringProperty(filterName);
if (value != null)
{
if ( (Conditions.EQUAL == filterCondition) && (((String)filterValue).equals(value)) )
flag = true;
else if ( (Conditions.NOT_EQUAL == filterCondition) && (!(((String)filterValue).equals(value))) )
flag = true;
}
}
else if (filterValue instanceof Integer)
{
int value = getMsg.getIntProperty(filterName);
if ( (Conditions.EQUAL == filterCondition) && (value == (Integer)filterValue) )
flag = true;
else if ( (Conditions.NOT_EQUAL == filterCondition) && (value != (Integer)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN == filterCondition) && (value < (Integer)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN_EQUAL == filterCondition) && (value <= (Integer)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN == filterCondition) && (value > (Integer)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN_EQUAL == filterCondition) && (value >= (Integer)filterValue) )
flag = true;
}
else if (filterValue instanceof Long)
{
long value = getMsg.getLongProperty(filterName);
if ( (Conditions.EQUAL == filterCondition) && (value == (Long)filterValue) )
flag = true;
else if ( (Conditions.NOT_EQUAL == filterCondition) && (value != (Long)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN == filterCondition) && (value < (Long)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN_EQUAL == filterCondition) && (value <= (Long)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN == filterCondition) && (value > (Long)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN_EQUAL == filterCondition) && (value >= (Long)filterValue) )
flag = true;
}
else if (filterValue instanceof Double)
{
double value = getMsg.getDoubleProperty(filterName);
if ( (Conditions.EQUAL == filterCondition) && (value == (Double)filterValue) )
flag = true;
else if ( (Conditions.NOT_EQUAL == filterCondition) && (value != (Double)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN == filterCondition) && (value < (Double)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN_EQUAL == filterCondition) && (value <= (Double)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN == filterCondition) && (value > (Double)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN_EQUAL == filterCondition) && (value >= (Double)filterValue) )
flag = true;
}
else if (filterValue instanceof Float)
{
float value = getMsg.getFloatProperty(filterName);
if ( (Conditions.EQUAL == filterCondition) && (value == (Float)filterValue) )
flag = true;
else if ( (Conditions.NOT_EQUAL == filterCondition) && (value != (Float)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN == filterCondition) && (value < (Float)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN_EQUAL == filterCondition) && (value <= (Float)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN == filterCondition) && (value > (Float)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN_EQUAL == filterCondition) && (value >= (Float)filterValue) )
flag = true;
}
else if (filterValue instanceof Boolean)
{
Boolean value = getMsg.getBooleanProperty(filterName);
if ( (value != null) && ((Boolean)filterValue == value) )
flag = true;
}
else if (filterValue instanceof Byte)
{
byte value = getMsg.getByteProperty(filterName);
if ((Byte)filterValue == value)
flag = true;
}
else if (filterValue instanceof Byte[])
{
byte[] value = getMsg.getBytesProperty(filterName);
if ( (value != null) && (java.util.Arrays.equals((byte[])filterValue, value)) )
flag = true;
}
}
catch (Exception e)
{}
return flag;
}
/**
* Delete the message that the cursor is pointing to.
*/
private void deleteMessage()
{
MQMessage deleteMsg = new MQMessage();
MQGetMessageOptions gmo = new MQGetMessageOptions();
gmo.options = CMQC.MQGMO_MSG_UNDER_CURSOR + CMQC.MQGMO_NO_WAIT + CMQC.MQGMO_FAIL_IF_QUIESCING + CMQC.MQGMO_ACCEPT_TRUNCATED_MSG;
/**
* don't need it - because we already have the message
* just delete it.
*/
try
{
inQ.get(deleteMsg, gmo, 1); // only get 1 byte - who cares right!!
}
catch (MQException e)
{}
}
}
ms = new MessageSelector(qMgr);
ms.openQueue(inputQName);
ms.setFilter("SomeNum", MessageSelector.Conditions.GREATER_THAN_EQUAL, 123);
while (true)
{
receiveMsg = ms.getMessage(startAtBeginning);
// got the message, now go and do something with it.
// set flag to continue rather than restart at the beginning.
startAtBeginning = false;
}
ms.closeQueue();
import java.io.IOException;
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.CMQC;
/**
* Class Name
* MessageSelector
*
* Description
* This java class will retrieve messages from a queue based on a filter.
*
* @author Roger Lacroix
* @version 1.0.0
* @license Apache 2 License
*/
public class MessageSelector
{
public enum Conditions
{
EQUAL, NOT_EQUAL, LESS_THAN, LESS_THAN_EQUAL, GREATER_THAN, GREATER_THAN_EQUAL;
}
private MQQueueManager qMgr = null;
private MQQueue inQ = null;
private String filterName = null;
private Conditions filterCondition;
private Object filterValue = null;
/**
* The constructor
* @param qMgr - must have a valid/active connection to the queue manager
*/
public MessageSelector(MQQueueManager qMgr)
{
super();
this.qMgr = qMgr;
}
/**
* Open the queue for both browsing and destructive gets.
* @param qName
* @throws MQException
*/
public void openQueue(String qName) throws MQException
{
inQ = qMgr.accessQueue(qName, CMQC.MQOO_INQUIRE + CMQC.MQOO_BROWSE + CMQC.MQOO_FAIL_IF_QUIESCING + CMQC.MQOO_INPUT_SHARED);
}
/**
* Close the queue.
* @throws MQException
*/
public void closeQueue() throws MQException
{
if (inQ != null)
inQ.close();
}
/**
* Set the filter name, condition and value.
* @param name
* @param condition
* @param value
* @throws IllegalArgumentException
*/
public void setFilter(String name, Conditions condition, Object value) throws IllegalArgumentException
{
if (name == null)
throw new IllegalArgumentException("Filter name cannot be null.");
else if ("".equals(name))
throw new IllegalArgumentException("Filter name cannot be blank.");
else if (value == null)
throw new IllegalArgumentException("Filter value cannot be null.");
if ( (value instanceof String) || (value instanceof Boolean) ||
(value instanceof Byte) || (value instanceof Byte[]) )
{
if ( (Conditions.EQUAL != condition) && (Conditions.NOT_EQUAL != condition) )
{
throw new IllegalArgumentException("Filter condition can only be EQUAL or NOT_EQUAL.");
}
}
else if ( (value instanceof Integer) || (value instanceof Long) ||
(value instanceof Double) || (value instanceof Float) )
{
if ( (Conditions.EQUAL != condition) && (Conditions.NOT_EQUAL != condition) &&
(Conditions.LESS_THAN != condition) && (Conditions.LESS_THAN_EQUAL != condition) &&
(Conditions.GREATER_THAN != condition) && (Conditions.GREATER_THAN_EQUAL != condition) )
{
throw new IllegalArgumentException("Filter condition must be one of the following: EQUAL, NOT_EQUAL, LESS_THAN, LESS_THAN_EQUAL, GREATER_THAN, GREATER_THAN_EQUAL.");
}
}
else
{
throw new IllegalArgumentException("Unknown Object type for Filter value.");
}
/**
* Pass the checks, save the values
*/
this.filterName = name;
this.filterCondition = condition;
this.filterValue = value;
}
/**
* Retrieve the next matching message from the queue.
* @param reset - Start over from the beginning of the queue.
* @return
* @throws MQException
* @throws IOException
*/
public MQMessage getMessage(boolean reset) throws MQException, IOException
{
MQGetMessageOptions gmo = new MQGetMessageOptions();
if (reset)
gmo.options = CMQC.MQGMO_BROWSE_FIRST + CMQC.MQGMO_NO_WAIT + CMQC.MQGMO_FAIL_IF_QUIESCING;
else
gmo.options = CMQC.MQGMO_BROWSE_NEXT + CMQC.MQGMO_NO_WAIT + CMQC.MQGMO_FAIL_IF_QUIESCING;
MQMessage getMsg = null;
while (true)
{
getMsg = new MQMessage();
inQ.get(getMsg, gmo);
if (performConditionalTest(getMsg))
{
deleteMessage();
break;
}
gmo.options = CMQC.MQGMO_BROWSE_NEXT + CMQC.MQGMO_NO_WAIT + CMQC.MQGMO_FAIL_IF_QUIESCING;
}
return getMsg;
}
/**
* Handle the conditional testing of the value.
* @param getMsg
* @return true/false
*/
private boolean performConditionalTest(MQMessage getMsg)
{
boolean flag = false;
try
{
if (filterValue instanceof String)
{
String value = getMsg.getStringProperty(filterName);
if (value != null)
{
if ( (Conditions.EQUAL == filterCondition) && (((String)filterValue).equals(value)) )
flag = true;
else if ( (Conditions.NOT_EQUAL == filterCondition) && (!(((String)filterValue).equals(value))) )
flag = true;
}
}
else if (filterValue instanceof Integer)
{
int value = getMsg.getIntProperty(filterName);
if ( (Conditions.EQUAL == filterCondition) && (value == (Integer)filterValue) )
flag = true;
else if ( (Conditions.NOT_EQUAL == filterCondition) && (value != (Integer)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN == filterCondition) && (value < (Integer)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN_EQUAL == filterCondition) && (value <= (Integer)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN == filterCondition) && (value > (Integer)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN_EQUAL == filterCondition) && (value >= (Integer)filterValue) )
flag = true;
}
else if (filterValue instanceof Long)
{
long value = getMsg.getLongProperty(filterName);
if ( (Conditions.EQUAL == filterCondition) && (value == (Long)filterValue) )
flag = true;
else if ( (Conditions.NOT_EQUAL == filterCondition) && (value != (Long)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN == filterCondition) && (value < (Long)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN_EQUAL == filterCondition) && (value <= (Long)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN == filterCondition) && (value > (Long)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN_EQUAL == filterCondition) && (value >= (Long)filterValue) )
flag = true;
}
else if (filterValue instanceof Double)
{
double value = getMsg.getDoubleProperty(filterName);
if ( (Conditions.EQUAL == filterCondition) && (value == (Double)filterValue) )
flag = true;
else if ( (Conditions.NOT_EQUAL == filterCondition) && (value != (Double)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN == filterCondition) && (value < (Double)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN_EQUAL == filterCondition) && (value <= (Double)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN == filterCondition) && (value > (Double)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN_EQUAL == filterCondition) && (value >= (Double)filterValue) )
flag = true;
}
else if (filterValue instanceof Float)
{
float value = getMsg.getFloatProperty(filterName);
if ( (Conditions.EQUAL == filterCondition) && (value == (Float)filterValue) )
flag = true;
else if ( (Conditions.NOT_EQUAL == filterCondition) && (value != (Float)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN == filterCondition) && (value < (Float)filterValue) )
flag = true;
else if ( (Conditions.LESS_THAN_EQUAL == filterCondition) && (value <= (Float)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN == filterCondition) && (value > (Float)filterValue) )
flag = true;
else if ( (Conditions.GREATER_THAN_EQUAL == filterCondition) && (value >= (Float)filterValue) )
flag = true;
}
else if (filterValue instanceof Boolean)
{
Boolean value = getMsg.getBooleanProperty(filterName);
if ( (value != null) && ((Boolean)filterValue == value) )
flag = true;
}
else if (filterValue instanceof Byte)
{
byte value = getMsg.getByteProperty(filterName);
if ((Byte)filterValue == value)
flag = true;
}
else if (filterValue instanceof Byte[])
{
byte[] value = getMsg.getBytesProperty(filterName);
if ( (value != null) && (java.util.Arrays.equals((byte[])filterValue, value)) )
flag = true;
}
}
catch (Exception e)
{}
return flag;
}
/**
* Delete the message that the cursor is pointing to.
*/
private void deleteMessage()
{
MQMessage deleteMsg = new MQMessage();
MQGetMessageOptions gmo = new MQGetMessageOptions();
gmo.options = CMQC.MQGMO_MSG_UNDER_CURSOR + CMQC.MQGMO_NO_WAIT + CMQC.MQGMO_FAIL_IF_QUIESCING + CMQC.MQGMO_ACCEPT_TRUNCATED_MSG;
/**
* don't need it - because we already have the message
* just delete it.
*/
try
{
inQ.get(deleteMsg, gmo, 1); // only get 1 byte - who cares right!!
}
catch (MQException e)
{}
}
}
import java.io.IOException；
导入com.ibm.mq.MQException；
导入com.ibm.mq.MQGetMessageOptions；
导入com.ibm.mq.MQMessage；
导入com.ibm.mq.MQQueue；
导入com.ibm.mq.MQQueueManager；
导入com.ibm.mq.constants.CMQC；
/**
*类名
*消息选择器
*
*描述
*这个java类将根据过滤器从队列中检索消息。
*
*@作者罗杰·拉克鲁瓦
*@version 1.0.0
*@license Apache 2许可证
*/
公共类消息选择器
{
公共枚举条件
{
相等、不相等、小于、小于、大于、大于；
}
专用MQQueueManager qMgr=null；
私有MQQueue inQ=null；
私有字符串filterName=null；
私人条件过滤条件；
私有对象filterValue=null；
/**
*构造器
*@param qMgr-必须具有到队列管理器的有效/活动连接
*/
公共消息选择器（MQQueueManager qMgr）
{
超级（）；
this.qMgr=qMgr；
}
/**
*为浏览和破坏性获取打开队列。
*@param qName
*@MQException
*/
public void openQueue（字符串qName）引发MQException
{
inQ=qMgr.accessQueue（qName，CMQC.MQOO\u INQUIRE+CMQC.MQOO\u BROWSE+CMQC.MQOO\u FAIL\u如果\u QUIESCING+CMQC.MQOO\u INPUT\u SHARED）；
}
/**
*关闭队列。
*@MQException
*/
public void closeQueue（）引发MQException
{
如果（inQ！=null）
inQ.close（）；
}
/**
*设置过滤器名称、条件和值。
*@param name
*@param条件
*@param值
*@galargumentException
*/
public void setFilter（字符串名称、条件、对象值）引发IllegalArgumentException
{
if（name==null）
抛出新的IllegalArgumentException（“筛选器名称不能为null”）；
如果（“.”等于（名称））
抛出新的IllegalArgumentException（“筛选器名称不能为空”）；
else if（值==null）
抛出新的IllegalArgumentException（“筛选器值不能为null”）；
if（（字符串的值实例）| |（布尔值的值实例）||
（字节值实例）| |（字节值实例[]）
{
if（（Conditions.EQUAL！=条件）和&（Conditions.NOT_EQUAL！=条件））
{
抛出新的IllegalArgumentException（“过滤条件只能等于或不等于”）；
}
}
else如果（（整数的值实例）| |（值