Question

我想写一个简单的代码示例，它将消息发送到交换机，通过监听器接收它并发回消息。

这是我发送消息的方式：

private static void pingpong(Object messageListener) throws Exception {
    ConnectionFactory cf = new CachingConnectionFactory("localhost");

    // set up the queue, exchange, binding on the broker
    RabbitAdmin admin = new RabbitAdmin(cf);
    Queue queue = new Queue(QUEUE);
    admin.declareQueue(queue);
    TopicExchange exchange = new TopicExchange(EXCHANGE);
    admin.declareExchange(exchange);
    admin.declareBinding(BindingBuilder.bind(queue).to(exchange).with("foo.*"));

    // set up the listener and container
    SimpleMessageListenerContainer container = new SimpleMessageListenerContainer(cf);
    container.setMessageListener(messageListener);
    container.setQueueNames(QUEUE);
    container.start();

    // send something and receive result.
    RabbitTemplate template = new RabbitTemplate(cf);
    Object result = template.convertSendAndReceive(EXCHANGE, "foo.bar", "ping");
    System.out.println("Received: " + result);
}

听众的代码：

public static class PingPongReceiver {
    public String handleMessage(String in) {
        System.out.println("Received: " + in);
        return "pong";
    }
}

这就是我所说的：

pingpong(new MessageListenerAdapter(new PingPongReceiver()));

但发送回复失败，但以下情况除外：

org.springframework.amqp.rabbit.listener.exception.ListenerExecutionFailedException: Listener threw exception
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.wrapToListenerExecutionFailedExceptionIfNeeded(AbstractMessageListenerContainer.java:865)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:760)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:680)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$001(SimpleMessageListenerContainer.java:93)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$1.invokeListener(SimpleMessageListenerContainer.java:183)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.invokeListener(SimpleMessageListenerContainer.java:1345)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:661)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:1096)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:1080)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$800(SimpleMessageListenerContainer.java:93)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1190)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.amqp.rabbit.listener.adapter.ReplyFailureException: Failed to send reply with payload 'pong'
    at org.springframework.amqp.rabbit.listener.adapter.AbstractAdaptableMessageListener.handleResult(AbstractAdaptableMessageListener.java:213)
    at org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter.onMessage(MessageListenerAdapter.java:296)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:757)
    ... 10 more
Caused by: org.springframework.amqp.AmqpException: Cannot determine ReplyTo message property value: Request message does not contain reply-to property, and no default response Exchange was set.
    at org.springframework.amqp.rabbit.listener.adapter.AbstractAdaptableMessageListener.getReplyToAddress(AbstractAdaptableMessageListener.java:289)
    at org.springframework.amqp.rabbit.listener.adapter.AbstractAdaptableMessageListener.handleResult(AbstractAdaptableMessageListener.java:209)
    ... 12 more

我在确定如何使用匿名非持久队列发送回复时遇到问题。我错过了什么？

Answer 1

你所描述的是没有意义的; RabbitTemplate.convertAndReceive()设置replyTo（Direct reply-to如果代理支持它，否则设置临时队列。）

我只是复制并粘贴了你的代码，它对我来说很好......

Received: ping
Received: pong

也许你在队列中有一条旧的，陈旧的消息没有回复？

您可以使用管理界面清除队列。

我还用

测试了你的代码

Queue queue = new AnonymousQueue();
...
container.setQueueNames(queue.getName());

也很好。

顺便说一句，在手动创建Spring Beans时，建议您调用afterPropertiesSet（如果bean是初始化bean）。

container.afterPropertiesSet();

最后，你应该停止容器并破坏连接：

container.stop();
cf.destroy();

Spring AMQP：由于缺少回复属性而发送POJO侦听器失败的回复

1 个答案: