Spring Integration Http入站网关发送空白json应答

Question

下面使用Spring integration 2.2.6的代码

我想通过应答通道将响应发送回入站网关。我正在发送来自服务激活器的回复。但是Spring不能设置响应，而是返回空消息

<int-http:inbound-gateway id="entryHttpInboundGateway"
        request-channel="entryInputChannel" path="/service/getSE/{uuid}" reply-channel="entryInboundReplyChannel"
        request-payload-type="com.test.ServiceEvent" mapped-response-headers="eventUUID, HTTP_RESPONSE_HEADERS"
        supported-methods="GET, POST"  reply-timeout="1000" view-name="/process/plain2">
        <int-http:header name="eventUUID" expression="#pathVariables.uuid"/>
 </int-http:inbound-gateway>

<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver" p:order="1" 
        p:defaultContentType="application/json">
        <property name="defaultViews">
            <list>
                <bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
            </list>
        </property>
</bean>

<int:service-activator id="sv2" input-channel="entryInputChannel" output-channel="outputChannel"
    method="sendReply" requires-reply="true" ref="checkService">
  </int:service-activator>

 <bean id="checkService" class="com.test.CheckService" />

// Preparing the message to be sent to reply channel
     InboundReplyResponse inboundReplyResponse = new InboundReplyResponse();
        inboundReplyResponse.setMessage("Success");
        inboundReplyResponse.setEventUUID("12345");

    Map<String, Object> responseHeaderMap = new HashMap<String, Object>();
                    responseHeaderMap.put("eventUUID",eventUUID);
                    responseHeaderMap.put("Content-Type","application/json");

    GenericMessage<InboundReplyResponse> message = new GenericMessage<InboundReplyResponse>(inboundReplyResponse,responseHeaderMap);


    //Reply queue -> entryInboundReplyChannel
        MessageChannel entryInboundReplyChannel =  (MessageChannel) AppFactory.getApplicationContext().getBean("entryInboundReplyChannel");

    entryInboundReplyChannel.send(message);

 <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring-integration-context.xml</param-value>
    </context-param>


    <servlet>
        <servlet-name>ssTesting</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

  <servlet-mapping>    
        <servlet-name>ssTesting</servlet-name>    
        <url-pattern>/service/*</url-pattern>  
    </servlet-mapping>

<Empty JSON content>

Answer 1

你的代码看起来很糟糕。

您可以直接发送到entryInboundReplyChannel，前提是您在网关的调用线程中。因为网关的SendandReceive依赖于MessageHeaders中的TemporaryReplyChannel。最后一个独立于入站网关上显式的应答通道。

为什么不将EntryInboundReplyChannel用作 的output-channel，而是返回来自SendReply方法的消息，并仅仅依靠Framewrok功能来正确地修改流呢？

我不手动使用entryInboundReplyChannel.send（message）。