这是我运行主程序时遇到的错误。我不太明白为什么它在第44行有问题:channel.basicConsume(Q,true,consumer); 我的目标是尝试将收到的消息存储到一个可以在其他文件中使用的变量中。
The error is: Exception in thread "main" java.io.IOException
at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:105)
at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:101)
at com.rabbitmq.client.impl.ChannelN.basicConsume(ChannelN.java:1255)
at com.rabbitmq.client.impl.recovery.AutorecoveringChannel.basicConsume(AutorecoveringChannel.java:471)
at com.rabbitmq.client.impl.recovery.AutorecoveringChannel.basicConsume(AutorecoveringChannel.java:461)
at com.rabbitmq.client.impl.recovery.AutorecoveringChannel.basicConsume(AutorecoveringChannel.java:456)
at Recv.recv(Recv.java:44)
at mainLaptop.main(mainLaptop.java:11)
Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=404, reply-text=NOT_FOUND - no queue 'Leonardo' in vhost '/', class-id=60, method-id=20)
at com.rabbitmq.utility.ValueOrException.getValue(ValueOrException.java:66)
at com.rabbitmq.utility.BlockingValueOrException.uninterruptibleGetValue(BlockingValueOrException.java:32)
at com.rabbitmq.client.impl.AMQChannel$BlockingRpcContinuation.getReply(AMQChannel.java:366)
at com.rabbitmq.client.impl.ChannelN.basicConsume(ChannelN.java:1253)
... 5 more
这是我的Recv文件的代码
public class Recv
{
public static String recv(String ip, String Q) throws Exception
{
ConnectionFactory factory = new ConnectionFactory();
factory.setHost(ip);
factory.setUsername("test");
factory.setPassword("test");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
MyConsumer consumer=new MyConsumer(channel);
channel.basicConsume(Q,true,consumer);
return consumer.getStoredMessage();
}
public static class MyConsumer extends DefaultConsumer
{
private String storedMessage;
public MyConsumer(Channel channel)
{
super(channel);
}
public String getStoredMessage()
{
return storedMessage;
}
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body)
throws IOException
{
String message = new String(body, "UTF-8");
System.out.println(" [x] Received '" + message + "'");
storedMessage = message; // store message here
}
}
}
许多异常包含有用的信息,以告诉您什么地方出了问题以及如何解决这些问题。
在这种情况下,您的问题是我不太了解为什么第44行存在问题:channel.basicConsume(Q,true,consumer);
即使堆栈跟踪很丑陋,您也需要阅读它,因为该异常包含以下文本:
Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=404, reply-text=NOT_FOUND - no queue 'Leonardo' in vhost '/', class-id=60, method-id=20)
错误非常明显。vshost'/'中没有队列'Leonardo'。您尚未Q
在RabbitMQ服务器中声明队列(以字符串形式传递)。因此,尝试从不存在的队列中消费是一个例外。首先声明队列,您的问题将消失。
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