我正在实现 MessageListner 类的 onMessgae () 方法，但即使我将调试点放入此方法中，它也不起作用，但调试器也不会进入此方法中。
使用该方法接收来自Queue的消息。 下面是我用于接收消息的代码，但当我通过发送者类发送消息时它没有给出任何消息，并且它的消息发送到 JMS 服务器并在服务器上显示为这样
名称服务器目的地当前消息当前消息待处理消息已接收 JMSServer-0 AdminServer 3 15 1 2
接收者代码:
{
import java.util.Hashtable;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueReceiver;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
public class QueueReceive implements MessageListener {
public final static String Server="t3://localhost:7001";
public final static String JNDI_FACTORY = "weblogic.jndi.WLInitialContextFactory";
public final static String JMS_FACTORY = "CF1";
enter code here
public final static String QUEUE = "Queue1";
private QueueConnectionFactory qconFactory;
private QueueConnection qcon;
private QueueSession qsession;
private QueueReceiver qreceiver;
private Queue queue;
private boolean quit = false;
String s1 = "avanish";
public void init(Context ctx, String queueName) throws NamingException, JMSException {
qconFactory = (QueueConnectionFactory) ctx.lookup(JMS_FACTORY);
qcon = qconFactory.createQueueConnection();
qsession = qcon.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
queue = (Queue) ctx.lookup(queueName);
qreceiver = qsession.createReceiver(queue);
qreceiver.setMessageListener(this);
qcon.start();
System.out.println(qreceiver.receive());
}
public void close() throws JMSException {
qreceiver.close();
qsession.close();
qcon.close();
}
public static void main(String[] args) throws Exception {
/*if (args.length != 1) {
System.out.println("Usage: java examples.jms.queue.QueueReceive WebLogicURL");
return;
}*/
InitialContext ic = getInitialContext();
QueueReceive qr = new QueueReceive();
qr.init(ic, QUEUE);
System.out.println("JMS Ready To Receive Messages (To quit, send a \"quit\" message).");
synchronized (qr) {
while (!qr.quit) {
try {
qr.wait();
} catch (InterruptedException ie) {
}
}
}
qr.close();
}
private static InitialContext getInitialContext() throws NamingException {
Hashtable<String, String> env = new Hashtable<String, String>();
env.put(Context.INITIAL_CONTEXT_FACTORY, JNDI_FACTORY);
env.put(Context.PROVIDER_URL, Server);
return new InitialContext(env);
}
@Override
public void onMessage(Message msg) {
try {
String msgText;
if(msg instanceof TextMessage){
msgText = ((TextMessage) msg).getText();
}
else{
msgText = msg.toString();
}
System.out.println("reciver msg" + msgText);
if(msgText.equalsIgnoreCase("quit")){
synchronized (this) {
quit= true;
this.notifyAll();
}
}
} catch (JMSException e) {
System.err.println("Exception" + e.getMessage());
}
}
}
}
发件人代码: {
import javax.jms.JMSException;
import javax.jms.Queue;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Hashtable;
import javax.jms.*;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSender;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
public class QueueSend {
public final static String Server="t3://localhost:7001";
public final static String JNDI_FACTORY = "weblogic.jndi.WLInitialContextFactory";
public final static String JMS_FACTORY = "CF1";
public final static String QUEUE = "Queue1";
// public final static String QUEUE = "DQ";
private QueueConnectionFactory qconFactory;
private QueueConnection qcon;
private QueueSession qsession;
private QueueSender qsender;
private Queue queue;
private TextMessage msg;
public void init(Context ctx, String queueName) throws NamingException, JMSException
{
qconFactory = (QueueConnectionFactory) ctx.lookup(JMS_FACTORY);
qcon = qconFactory.createQueueConnection();
qsession = qcon.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
queue = (Queue) ctx.lookup(queueName);
qsender = qsession.createSender(queue);
msg = qsession.createTextMessage();
qcon.start();
}
public void send(String message) throws JMSException {
msg.setText(message);
//msg.acknowledge();
qsender.setPriority(9);
qsender.send(msg);
}
public void close() throws JMSException {
qsender.close();
qsession.close();
qcon.close();
}
public static void main(String[] args) throws Exception {
InitialContext ic = getInitialContext();
QueueSend qs = new QueueSend();
qs.init(ic, QUEUE);
readAndSend(qs);
qs.close();
}
private static void readAndSend(QueueSend qs) throws IOException, JMSException
{
BufferedReader msgStream = new BufferedReader(new InputStreamReader(System.in));
String line = null;
boolean quitNow = false;
do {
System.out.print("Enter message (\"quit\" to quit): \n");
line = msgStream.readLine();
if (line != null && line.trim().length() != 0) {
qs.send(line);
System.out.println("JMS Message Sent: " + line + "\n");
quitNow = line.equalsIgnoreCase("quit");
}
} while (!quitNow);
}
private static InitialContext getInitialContext()
throws NamingException
{
Hashtable<String, String> env = new Hashtable<String, String>();
env.put(Context.INITIAL_CONTEXT_FACTORY, JNDI_FACTORY);
env.put(Context.PROVIDER_URL, Server);
return new InitialContext(env);
}
}
}
最佳答案
使用 MessageListener 我使用了下面的代码行并从队列中获取了确切的消息
queue = (Queue) ctx.lookup(queueName);
qreceiver = qsession.createReceiver(queue);
message = qreceiver.receiveNoWait();
它已成功接收来自队列的消息。
关于java - 消息监听器 onMessage() 方法不会从队列中读取消息，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42154073/