問題描述

我目前正在努力解決一個相當簡單的問題.我想從 RabbitMQ 接收消息并將其轉換為字符串(或稍后轉換為 json 對象).但我得到的只是字節.

I am currently struggling hard with a fair simple problem. I want to receive a message from RabbitMQ and have that transformed into a string (or later a json object). But all I get is bytes.

Message 對象以這種方式將自身顯示為字符串

The Message object displays itself as a string that way

(Body:'{"cityId":644}'; ID:null; Content:application/json; Headers:{}; Exchange:; RoutingKey:pages.type.index; Reply:null; DeliveryMode:NON_PERSISTENT; DeliveryTag:1)

配置類(使用spring)

The configuration class (using spring)

@Configuration
public class RabbitConfiguration {

    @Bean
    public CachingConnectionFactory connectionFactory() {
        CachingConnectionFactory connectionFactory = new CachingConnectionFactory("www.example.com");
        connectionFactory.setUsername("xxxx");
        connectionFactory.setPassword("xxxx");
        return connectionFactory;
    }

    @Bean
    public MessageConverter jsonMessageConverter(){
        JsonMessageConverter jsonMessageConverter = new JsonMessageConverter();
        return jsonMessageConverter;
    }

    @Bean
    public SimpleMessageListenerContainer messageListenerContainer(){
        SimpleMessageListenerContainer container = new SimpleMessageListenerContainer(connectionFactory());
        container.setAutoStartup(false);
        container.setQueues(indexQueue());
        container.setConcurrentConsumers(1);
        container.setAcknowledgeMode(AcknowledgeMode.AUTO);
        container.setMessageListener(new MessageListenerAdapter(pageListener(), jsonMessageConverter()));
        return container;
    }

    @Bean
    public Queue indexQueue(){
        return new Queue("pages.type.index");
    }

    @Bean
    public MessageListener pageListener(){
        return new PageQueueListener();
    }

}

和消息監聽器

public class PageQueueListener implements MessageListener {

    public void onMessage(Message message) {
        System.out.println(message);
        System.out.println(message.getBody());
    }
 }

我的問題是，getBody() 方法顯示 [B@4dbb73b0 所以沒有任何東西被轉換.既不是字符串也不是 json 對象:(

my problem is, that the getBody() method displayes [B@4dbb73b0 so nothing is ever converted. Neither to a string nor to a json object :(

我覺得自己很愚蠢，但我在這里找不到解決方案

I feel stupid, but I cannot find a solution here

推薦答案

message.getBody() 返回一個byte[]

試試:

byte[] body = message.getBody();
System.out.println(new String(body));

這篇關于將消息從 RabbitMQ 轉換為字符串/json的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！