Message converter (JSON)

I said before ,Spring The message you send will be serialized into byte Send to MQ, When receiving messages , It also deserializes bytes into Java object .

It's just , By default Spring The serialization method used is JDK serialize . as everyone knows ,JDK Serialization has the following problems ：

• The data volume is too large

• There are security holes

• Poor readability

step

1： Introduce dependencies into the parent project

<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.9.10</version>
</dependency>

2： Configure bean

@Bean
public MessageConverter jsonMessageConverter(){
    return new Jackson2JsonMessageConverter();
}

3： Be careful , What does the producer send , What is used by consumers to receive .

for example ： I use it here. map Send and receive

consumer

 // Set the transmission data format listening queue 
    @RabbitListener(queues = "object.queue")
    public void listenObjectQueue(Map<String,Object> msg){
        System.out.println(" Received object.queue The news is ："+msg);
    }

producer

    @Test
    public void testSendMap() throws InterruptedException {
        //  Prepare the news 
        Map<String,Object> msg = new HashMap<>();
        msg.put("name", " Liu Yan ");
        msg.put("age", 21);
        //  Send a message 
        rabbitTemplate.convertAndSend("object.queue",msg);
    }