我是一个尝试将qpid与Apache Camel集成的新手。我需要编写Java代码以使用qpid从队列读取和写入。
因此，首先我从qpid网站下载了JMS示例。我试图运行的代码是。
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package org.apache.qpid.jms.example;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.ExceptionListener;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.Context;
import javax.naming.InitialContext;
public class HelloWorld {
public static void main(String[] args) throws Exception {
try {
// The configuration for the Qpid InitialContextFactory has been supplied in
// a jndi.properties file in the classpath, which results in it being picked
// up automatically by the InitialContext constructor.
Context context = new InitialContext();
ConnectionFactory factory = (ConnectionFactory) context.lookup("myFactoryLookup");
Destination queue = (Destination) context.lookup("myQueueLookup");
Connection connection = factory.createConnection(System.getProperty("USER"), System.getProperty("PASSWORD"));
connection.setExceptionListener(new MyExceptionListener());
connection.start();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer messageProducer = session.createProducer(queue);
MessageConsumer messageConsumer = session.createConsumer(queue);
TextMessage message = session.createTextMessage("Hello world!");
messageProducer.send(message, DeliveryMode.NON_PERSISTENT, Message.DEFAULT_PRIORITY, Message.DEFAULT_TIME_TO_LIVE);
TextMessage receivedMessage = (TextMessage) messageConsumer.receive(2000L);
if (receivedMessage != null) {
System.out.println(receivedMessage.getText());
} else {
System.out.println("No message received within the given timeout!");
}
connection.close();
} catch (Exception exp) {
System.out.println("Caught exception, exiting.");
exp.printStackTrace(System.out);
System.exit(1);
}
}
private static class MyExceptionListener implements ExceptionListener {
@Override
public void onException(JMSException exception) {
System.out.println("Connection ExceptionListener fired, exiting.");
exception.printStackTrace(System.out);
System.exit(1);
}
}
}
这取决于文件::
# Set the InitialContextFactory class to use
java.naming.factory.initial = org.apache.qpid.jms.jndi.JmsInitialContextFactory
# Define the required ConnectionFactory instances
# connectionfactory.<JNDI-lookup-name> = <URI>
connectionfactory.myFactoryLookup = amqp://localhost:5672
# Configure the necessary Queue and Topic objects
# queue.<JNDI-lookup-name> = <queue-name>
# topic.<JNDI-lookup-name> = <topic-name>
queue.myQueueLookup = queue
topic.myTopicLookup = topic
现在，我了解到要使此功能正常运行，我需要某种称为Broker服务的东西。经过研究，我发现可以为此目的使用RabbitMQ。所以我将其下载到Windows计算机上，并尝试通过端口
localhost:5672连接到它。但是，当我运行代码时，出现错误::
2017-05-04 11:28:29,329 [main ] - ERROR JmsConnection - Failed to connect to remote at: amqp://localhost:5672
Caught exception, exiting.
javax.jms.JMSException: An existing connection was forcibly closed by the remote host
at org.apache.qpid.jms.exceptions.JmsExceptionSupport.create(JmsExceptionSupport.java:86)
at org.apache.qpid.jms.exceptions.JmsExceptionSupport.create(JmsExceptionSupport.java:108)
at org.apache.qpid.jms.JmsConnection.connect(JmsConnection.java:172)
at org.apache.qpid.jms.JmsConnectionFactory.createConnection(JmsConnectionFactory.java:204)
at org.apache.qpid.jms.example.HelloWorld.main(HelloWorld.java:48)
Caused by: java.io.IOException: An existing connection was forcibly closed by the remote host
at sun.nio.ch.SocketDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:43)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
at sun.nio.ch.IOUtil.read(IOUtil.java:192)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
at io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:288)
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1100)
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:372)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:123)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:624)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:559)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:476)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:438)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
at java.lang.Thread.run(Thread.java:745)
为什么会出现此错误？而此端口肯定正在我的本地计算机上侦听。再次，我是JMS的新手，因此任何指导将不胜感激:)
最佳答案
正如Tim所提到的，您至少还需要确保已加载代理实验性AMQP 1.0插件，而您没有提到这样做。
但是，在这种情况下，它可能并没有太大的区别。以前，由于我报告的一个问题在创建消费者和生产者时使他们停滞不前，因此我无法对RabbitMQ使用JMS客户端或其他AMQP 1.0客户端取得很大的成功：https://github.com/rabbitmq/rabbitmq-amqp1.0/issues/34
您提到的决定使用RabbitMQ的研究事物，听起来像您与现有的服务器解决方案无关？如果是这样，对于其他支持AMQP 1.0且常规使用JMS客户端的服务器，您可以尝试ActiveMQ，ActiveMQ Artemis，用于Java代理的Qpid，Qpid C ++代理或Qpid Dispatch路由器（在Windows上不起作用，您可以提及使用），等等。