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

查看：46 发布时间：2021/12/25 14:07:09 java spring spring-mvc websocket

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问题描述

我知道我需要在我的 servlet 上下文中注册用 @Controller 注释的类，以使我的 web 应用程序可访问.通常，我会这样做:

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

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

我添加到我的根应用程序上下文中的所有其他配置类.这是我的调度程序初始化程序通常的样子:

All other configuration classes I added to my root application context. Here is how my dispatcher initializer usually 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 WebSockets 时，事情变得更有趣了.为了让 websockets 工作，你必须把 WebSoketConfig.class 放到 servlet 上下文中.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，我创建了一个服务来向主题发送消息:

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);
    }
}

我需要在其他一些服务中使用这个服务(Autowire it).现在我陷入了僵局:

I need to use this service in some other services (Autowire it). And now I'm in a deadlock:

如果我试图在根应用程序上下文中创建 TimeServiceWs bean，正如预期的那样，它不会看到 SimpMessagingTemplate bean 并抛出 NoSuchBeanDefinitionException
如果我试图在 servlet 上下文中创建 TimeServiceWs bean，那么我无法将它自动连接到任何其他服务，因为根上下文无法看到 servlet 上下文 bean(就我知道)
如果我将所有配置移至 servlet 上下文，则所有 bean 均已成功创建，但出现以下异常:java.lang.IllegalStateException: No WebApplicationContext found 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

我该怎么办?根上下文中应该包含什么?servlet 上下文中应该包含什么?能否请您再澄清一次这些上下文之间的区别?

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?

如果您需要任何其他信息，请告诉我.

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

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

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

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