Spring - 在 RabbitMQ 侦听器中验证传入消息

Question

我正在使用 Spring Boot 框架。我想通过 RabbitMQ 将一个对象从一个服务发送到另一个服务，如下所示：

服务 A：

rabbitTemplate.convertAndSend("queue", createAccountRequestMessage);

服务 B：

@RabbitListener(queues = "queue")
public void onAccountRequested(@Valid CreateAccountRequestMessage createAccountRequestMessage, Channel channel, @Header(AmqpHeaders.DELIVERY_TAG, long tag) throws IOException
{
    
}

在CreateAccountRequestMessage 类中，我定义了一些验证注释，例如@NotEmpty、@NotNull 等，但是当我从服务A 向服务B 发送错误消息时，@Valid 注释不起作用并且@ 987654327@ 对象在调用onAccountRequested 方法之前没有经过验证。

Answer 1

我遇到了同样的问题。 @Praveer 的答案很好，除了 SmartValidator。我在这里发布了我的解决方案，该解决方案的灵感来自这篇文章https://blog.trifork.com/2016/02/29/spring-amqp-payload-validation/

@Configuration
@EnableRabbit
@Slf4j
public class CmsMQConfig implements RabbitListenerConfigurer {

    @Value("${dw.rabbitmq.hosts}")
    private String hosts;

    @Value("${dw.rabbitmq.username}")
    private String username;

    @Value("${dw.rabbitmq.password}")
    private String password;

    @Value("${dw.rabbitmq.virtual-host}")
    private String virtualHost;

    public SimpleRabbitListenerContainerFactory rabbitListenerContainerFactory() {
        SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
        factory.setConnectionFactory(connectionFactory());
        factory.setMessageConverter(messageConverter());
        return factory;
    }

    @Bean
    public ConnectionFactory connectionFactory() {
        CachingConnectionFactory connectionFactory = new CachingConnectionFactory();
        connectionFactory.setAddresses(hosts);
        connectionFactory.setUsername(username);
        connectionFactory.setPassword(password);
        connectionFactory.setVirtualHost(virtualHost);
        return connectionFactory;
    }

    @Bean
    public Jackson2JsonMessageConverter messageConverter() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.registerModule(new JodaModule());
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        return new Jackson2JsonMessageConverter(mapper);
    }

    @Bean
    public DefaultMessageHandlerMethodFactory defaultHandlerMethodFactory() {
        DefaultMessageHandlerMethodFactory factory = new DefaultMessageHandlerMethodFactory();
        factory.setValidator(amqpValidator());
        return factory;
    }

    @Bean
    public Validator amqpValidator() {
        return new OptionalValidatorFactoryBean();
    }

    @Override
    public void configureRabbitListeners(RabbitListenerEndpointRegistrar registrar) {
        registrar.setContainerFactory(rabbitListenerContainerFactory());
        registrar.setMessageHandlerMethodFactory(defaultHandlerMethodFactory());
    }
}

Answer 2

您需要在DefaultMessageHandlerMethodFactory中设置验证器。

@Autowired
SmartValidator validator;

@Bean
public DefaultMessageHandlerMethodFactory messageHandlerMethodFactory() {
    DefaultMessageHandlerMethodFactory factory = new DefaultMessageHandlerMethodFactory();
    factory.setValidator(this.validator);
    return factory;
}

那么你还需要指定@Payload注解和@Valid注解。

@RabbitListener(queues = "queue")
public void onAccountRequested(@Valid @Payload CreateAccountRequestMessage 
    createAccountRequestMessage, Channel channel, 
    @Header(AmqpHeaders.DELIVERY_TAG, long tag) throws IOException
{

}

现在MethodArgumentNotValidException 将被抛出并且消息将被丢弃，或者您可以将消息发送到死信交换。