Question

我们正在构建一个Spring Boot应用程序（2.0.4-RELEASE），该应用程序通过RabbitMQ接收消息。因此application.properties包含与Rabbit相关的配置：

spring.rabbitmq.addresses=****
spring.rabbitmq.username=****
spring.rabbitmq.password=****
spring.rabbitmq.listener.simple.concurrency=2
spring.rabbitmq.listener.simple.prefetch=5
spring.rabbitmq.listener.simple.retry.enabled=true
spring.rabbitmq.listener.simple.retry.max-attempts=5

配置：

@Bean
public TopicExchange fileUpdate() {
    return new TopicExchange("my.fancy.exchange", true, false);
}

@Bean
public Queue fileUpload() {
    return new Queue("myFancyQueue", true);
}

@Bean
public Binding bindingUpload(Queue queue, TopicExchange eventExchange) {
    return BindingBuilder.bind(queue).to(eventExchange).with("");
}

消息使用者：

@RabbitListener(queues = "myFancyQueue")
public void receive(Object message) {
    ...
}

在收到特定类型的消息（例如__TypeId__: my.fancy.package.Clazz）时，会引发以下错误：

由于：java.lang.IllegalArgumentException：类'my.fancy.package.Clazz'不是在受信任的程序包中：[java.util，java.lang]。如果你相信这一点可以安全地反序列化该类，请提供其名称。如果序列化仅由受信任的来源完成，您还可以启用信任所有人（*）。

根据到目前为止我发现的，activeMQ通过application.properties为

为此提供了一个配置选项

spring.activemq.packages.trust-all=

或

spring.activemq.packages.trusted=

但是我找不到适用于RabbitMQ的任何类似选项。到目前为止，我一直在使用一种解决方法来解决我的问题，但是在配置文件中当然也可以有这样的选项。

到目前为止，我的解决方案是

添加到配置类：

@Bean
public MessageConverter jsonMessageConverter() {
    Jackson2JsonMessageConverter jsonMessageConverter = new Jackson2JsonMessageConverter(new ObjectMapper());
    jsonMessageConverter.setClassMapper(new ImporterClassMapper(FileUploadMessage.class));        
    return jsonMessageConverter;
}

@Bean
public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
    RabbitTemplate template = new RabbitTemplate(connectionFactory);
    template.setMessageConverter(jsonMessageConverter());
    return template;
}

并将消息使用者更改为

@Resource(name = "jsonMessageConverter")
private MessageConverter messageConverter;

@RabbitListener(queues = "${uploaded.files.queue}")
public void receive(Message message) {
    FileUploadMessage uploadMessage = (FileUploadMessage) messageConverter.fromMessage(message);
    ...
}

加上添加一个类映射器，该映射器允许导入未知类型并设置默认类型，以便在导入时将消息强制转换为该类型：

public class ImporterClassMapper implements ClassMapper, InitializingBean {

    private volatile Class<?> defaultType;

    public ImporterClassMapper(Class<?> defaultType) {
        this.defaultType = defaultType;
    }    

    @Override
    public void afterPropertiesSet() throws Exception {
        // nothing to do
    }

    @Override
    public void fromClass(Class<?> clazz, MessageProperties properties) {
        // avoid setting __TypeId__ header so consumers from other modules can implement their own DTOs
    }

    @Override
    public Class<?> toClass(MessageProperties properties) {
        return this.defaultType;
    }

    public void setClass(Class<?> type) {
        this.defaultType = type;
    }
}

有人建议如何改进此解决方案吗？

Answer 1

我通过在使用的Spring AMQP ClassMapper上设置受信任的软件包来修复了相同的错误。

@Configuration
public class RabbitConfig {

    @Bean
    @Scope("prototype")
    public SimpleRabbitListenerContainerFactory rabbitListenerContainerFactory(ConnectionFactory connectionFactory, ObjectMapper objectMapper) {
        SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
        factory.setConnectionFactory(connectionFactory);
        factory.setMessageConverter(jsonToMapMessageConverter(objectMapper));
        return factory;
    }

    @Bean
    public MessageConverter jsonToMapMessageConverter(ObjectMapper objectMapper) {
        Jackson2JsonMessageConverter messageConverter = new ImplicitJsonMessageConverter(objectMapper);
        DefaultClassMapper classMapper = new DefaultClassMapper();
        classMapper.setTrustedPackages("*");
        classMapper.setDefaultType(Map.class);
        messageConverter.setClassMapper(classMapper);
        return messageConverter;
    }

    public static class ImplicitJsonMessageConverter extends Jackson2JsonMessageConverter {    
        public ImplicitJsonMessageConverter(ObjectMapper jsonObjectMapper) {
            super(jsonObjectMapper, "*");
        }    
        @Override
        public Object fromMessage(Message message) throws MessageConversionException {
            message.getMessageProperties().setContentType("application/json");
            return super.fromMessage(message);
        }
    }
}

用于RabbitMQ的Spring Boot可信软件包

1 个答案: