Spring root应用程序上下文和servlet上下文混淆 [英] Spring root application context and servlet context confusion

查看：156 发布时间：2018/12/10 11:52:16 java spring spring-mvc websocket

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问题描述

我知道我需要在我的servlet上下文中注册带注释 @Controller 的类，以使我的webapp可访问。 Usualy，我按照以下方式进行：

I know that I need to register classes annotated @Controller in my servlet context to make my webapp accesible. Usualy, I do it the following way:

@Configuration
@EnableWebMvc
@ComponentScan({"foo.bar.controller"})
public class WebConfig extends WebMvcConfigurerAdapter {
    //other stuff like ViewResolvers, MessageResolvers, MessageConverters, etc.
}

我添加到根应用程序上下文中的所有其他配置类。以下是我的dispetcher初始化程序通常如下所示：

All other configuration classes I added to my root application context. Here is how my dispetcher initializer usualy look like:

public class DispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class<?>[] { RootConfig.class, ServiceConfig.class };
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class<?>[] { WebConfig.class };
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }
}

但是当我开始使用时，事情变得越来越有趣WebSockets的。要使websockets正常工作，您必须将WebSoketConfig.class放入servlet上下文。这是我的WebSocketConfig示例：

But things are getting more interesting when I started to use WebSockets. To get websockets working you have to put WebSoketConfig.class to servlet context. Here is my example of WebSocketConfig:

@Configuration
@EnableScheduling
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/chat").withSockJS();
    }

    @Override
    public void configureClientInboundChannel(ChannelRegistration channelRegistration) {
        channelRegistration.taskExecutor().corePoolSize(4).maxPoolSize(8);
    }

    @Override
    public void configureClientOutboundChannel(ChannelRegistration channelRegistration) {
        channelRegistration.taskExecutor().corePoolSize(4).maxPoolSize(8);
    }

    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        registry.enableSimpleBroker("/queue", "/topic");
        registry.setApplicationDestinationPrefixes("/app");
    }

}

此外，我创建了一个用于向主题发送消息的服务：

Also, I've created a service to send a message to the topic:

@Service
public class TimeServiceWsImpl implements TimeServiceWs {

    @Autowired
    private SimpMessagingTemplate messagingTemplate;

    @Override
    public void sentCurrentTime() {
        long currentTime = System.currentTimeMillis();
        String destination = "/topic/chatty";
        logger.info("sending current time to websocket /topic/time : " + currentTime);
        this.messagingTemplate.convertAndSend(destination, currentTime);
    }
}

我需要在其他服务中使用此服务（自动装配它）。现在我陷入僵局：

I need to use this service in some other sevices (autowire it). And now I'm in deadlock:

如果我正在尝试创建 TimeServiceWs bean在根应用程序上下文中，正如预期的那样，它看不到 SimpMessagingTemplate bean并抛出 NoSuchBeanDefinitionException

如果我在servlet上下文中尝试创建 TimeServiceWs bean，那么我无法将其自动装配到任何其他服务，因为根上下文可以'请参阅servlet上下文bean（据我所知）

如果我将所有配置移动到servlet上下文，则会成功创建所有bean，但是我得到以下异常： java.lang.IllegalStateException：找不到WebApplicationContext 并且无法访问我的webapp

If I'm trying to create TimeServiceWs bean inside root application context, as expected it doesn't see SimpMessagingTemplate bean and throws NoSuchBeanDefinitionException
If I'm trying to create TimeServiceWs bean inside servlet context, then I'm unable to autowire it to any another service, because root context can't see servlet context beans(as far as I know)
If I move all my configurations to servlet context, all beans are successfully created, but I get the following exception: java.lang.IllegalStateException: No WebApplicationContext found and can't access my webapp

什么是我该怎么办？在根上下文中应该是什么？ servlet上下文应该是什么？您能再次澄清这些背景之间的区别吗？

What am I supposed to do? What should be inside root context? What should be inside servlet context? And could you please clarify the difference between these context one more time please?

如果您需要任何额外的信息，请告诉我。

If you will need any additional inforamtion, just let me know.

Spring root应用程序上下文和servlet上下文混淆 [英] Spring root application context and servlet context confusion

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Spring root应用程序上下文和servlet上下文混淆 [英] Spring root application context and servlet context confusion

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