spring amqp rabbitmq MessageListener无效 [英] spring amqp rabbitmq MessageListener not working

问题描述

我正在尝试使用spring amqp使用rabbitmq，下面是我的配置。

I am trying to use rabbitmq using spring amqp, below is my configuration.

<rabbit:connection-factory id="rabbitConnectionFactory"
    port="${rabbitmq.port}" host="${rabbitmq.host}" />

<rabbit:admin connection-factory="rabbitConnectionFactory" />

<rabbit:queue name="${rabbitmq.import.queue}" />

<rabbit:template id="importAmqpTemplate"
    connection-factory="rabbitConnectionFactory" queue="${rabbitmq.import.queue}" />

<beans:bean id="importExchangeMessageListener"
    class="com.stockopedia.batch.foundation.ImportMessageListener" />

<rabbit:listener-container
    connection-factory="rabbitConnectionFactory" concurrency="5">
    <rabbit:listener queues="${rabbitmq.import.queue}" ref="importMessageListener" />
</rabbit:listener-container>

这是一个简单的Message Listener类，

This is simple Message Listener class,

import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageListener;

public class ImportMessageListener implements MessageListener {

    @Override
    public void onMessage(Message message) {
        System.out.println("consumer output: " + message);
    }

}

这是生产者（即itemWriter）春季批次），

This is producer (which is itemWriter of spring batch),

public class ImportItemWriter<T> implements ItemWriter<T> {

    private AmqpTemplate template;

    public AmqpTemplate getTemplate() {
        return template;
    }

    public void setTemplate(AmqpTemplate template) {
        this.template = template;
    }

    public void write(List<? extends T> items) throws Exception {
        for (T item : items) {
            Object reply = template.convertSendAndReceive(item.toString());
            System.out.println("producer output: " + reply);
        }
    }

}

当我运行我的Spring批处理作业，调用ImportItemWriter.write。但是ImportMessageListener.onMessage不起作用。它不打印消息。我得到控制台上所有项目的输出

When I run my spring batch job, ImportItemWriter.write gets called. But ImportMessageListener.onMessage does not work. It doesnt print the message. I get below output for all items on console

producer output: null
producer output: null
producer output: null
producer output: null
producer output: null
producer output: null
producer output: null

推荐答案

您的消费者未发送结果...

Your consumer is not sending a result...

@Override
public void onMessage(Message message) {
    System.out.println("consumer output: " + message);
}

将其更改为简单的POJO;容器的 MessageListenerAdapter 将为您处理转换，并发送结果。

Change it to a simple POJO; the container's MessageListenerAdapter will take care of the conversion for you, and send the result.

@Override
public String handleMessage(String message) {
    System.out.println("consumer output: " + message);
    return "result";
}

编辑：

您还没有设置任何交换或路由到您的队列。如果您想使用默认的交换/路由，请使用...

You also haven't set up any exchange or routing to your queue. If you want to use default exchange/routing, use...

convertSendAndReceive("", queueName, item.toString());

EDIT2：

或者，设置模板上的 routingKey 到队列名称然后你可以使用更简单的方法。

Or, set the routingKey on the template to the queue name and then you can use the simpler method.

... sendAndReceive（）方法用于请求/回复方案，因此需要阻塞。要异步执行，您必须使用 ... send（）方法之一，并连接自己的 SimpleListenerContainer 收到回复;你必须做自己的关联。使用

The ...sendAndReceive() methods are meant for request/reply scenarios so blocking is required. To do it asynchronously, you have to use one of the ...send() methods, and wire up your own SimpleListenerContainer to receive the replies; you will have to do your own correlation. Use

public void convertAndSend(Object message, MessagePostProcessor postProcessor)

并在邮件处理器中设置 replyTo 和 correlationId header ...

and in your message post processor, set the replyTo and correlationId headers...

message.getMessageProperties().setReplyTo("foo");
message.getMessageProperties().setCorrelationId("bar");

或者，自己构建消息对象（例如，使用 MessageBuilder ）并使用发送方法...

Or, build the Message object yourself (e.g by using the MessageBuilder) and use the send method...

template.send(MessageBuilder.withBody("foo".getBytes())
            .setReplyTo("bar")
            .setCorrelationId("baz".getBytes())
            .build());

每个请求都需要一个唯一的 correlationId 所以你可以关联响应。

Each request needs a unique correlationId so you can correlate the response.

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