spring amqp rabbitmq MessageListener 不工作
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>
这是一个简单的消息监听类，
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producer(即spring batch的itemWriter)，
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 批处理作业时， ImportItemWriter.write 被调用.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低于输出
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
您的消费者没有发送结果...
Your consumer is not sending a result...
@Override
public void onMessage(Message message) {
System.out.println("consumer output: " + message);
}
改成简单的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";
}
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());
或者，将模板上的 routingKey 设置为队列名称，然后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() 方法适用于请求/回复场景，因此需要阻塞.要异步执行此操作，您必须使用 ...send() 方法之一，并连接您自己的 SimpleListenerContainer 以接收回复；你将不得不做你自己的相关性.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)
在您的消息后处理器中，设置 replyTo 和 correlationId 标头...
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 Message 对象(例如 通过使用 MessageBuilder) 并使用 send 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，以便您可以关联响应.
Each request needs a unique correlationId so you can correlate the response.
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