Question

这是我运行main时遇到的错误。我真的不明白它为什么会出现第44行的问题：channel.basicConsume（Q，true，consumer）; 我的目标是尝试将收到的消息存储到我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
    }
}
}

Answer 1

许多例外都包含有用的信息，可以告诉您哪些是错的，以及您可以采取哪些措施来解决这些问题。

在这种情况下，您的问题是我真的不明白为什么第44行出现问题：channel.basicConsume(Q,true,consumer);

即使堆栈跟踪很难看，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)

错误很明显。 在vshost'/'中没有排队'Leonardo'。您尚未在RabbitMQ服务器中声明队列，该队列以字符串Q传递。因此，尝试从不存在的队列中进行消费是一种例外。首先声明队列，你的问题就会消失。

Rabbit mq错误：在线程“main”java.io.IOException中获取异常引起：com.rabbitmq.client.ShutdownSignalException

1 个答案: