Question

我正在尝试调用RabbitTemplate#addBeforePublishPostProcessors和RabbitTemplate#addAfterReceivePostProcessors，而不会过多地干扰Spring的自动配置。

我正在尝试执行此操作，但是我的MessagePostProcessor没有触发（我在正在发布的消息中没有看到“ test_header”）。

  @EventListener
  void test(ApplicationPreparedEvent event) {
    ConfigurableApplicationContext applicationContext = event.getApplicationContext();
    RabbitTemplate rabbitTemplate = applicationContext.getBean(RabbitTemplate.class);
    rabbitTemplate.addBeforePublishPostProcessors(new MessagePostProcessor() {
      @Override
      public Message postProcessMessage(Message message) throws AmqpException {
        message.getMessageProperties().setHeader("test_header", "test_header_value");
        return message;
      }
    });
  }

为此合适的地方是什么？

我也尝试过听ApplicationStartedEvent。

Answer 1

使用BeanPostProcessor。

@SpringBootApplication
public class So56155062Application {

    public static void main(String[] args) {
        SpringApplication.run(So56155062Application.class, args);
    }

    @Bean
    public static BeanPostProcessor bpp() {
        return new BeanPostProcessor() {

            @Override
            public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
                if (bean instanceof RabbitTemplate) {
                    ((RabbitTemplate) bean).setBeforePublishPostProcessors(m -> {
                        m.getMessageProperties().setHeader("foo", "baz");
                        return m;
                    });
                }
                return bean;
            }

        };

    }

    @Bean
    public ApplicationRunner runner(RabbitTemplate template) {
        return args -> template.convertAndSend("foo", "bar");
    }

    @RabbitListener(queues = "foo")
    public void listen(String in, @Header("foo") String header) {
        System.out.println(in + header);
    }

}

请注意static修饰符

Spring AMQP：将消息处理器添加到自动配置的“ RabbitTemplate”中

1 个答案: