这是我想要实现的目标。每15分钟轮询一次HTTP API并处理从中检索到的数据。我们计划使用Spring Integration。我是新手。因此，我很少理解，我已经创建了一个出站网关并添加了相同的轮询，但得到了以下错误。
另外，有人可以告诉我如何使用变换器处理来自出站网关的数据？
Error creating bean with name 'org.springframework.integration.config.ConsumerEndpointFactoryBean#0':
Invocation of init method failed; nested exception is java.lang.IllegalArgumentException:
A poller should not be specified for endpoint 'org.springframework.integration.config.ConsumerEndpointFactoryBean#0',
since 'in' is a SubscribableChannel (not pollable).
我的int-config.xml文件是
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
http://www.springframework.org/schema/integration/http http://www.springframework.org/schema/integration/http/spring-integration-http.xsd
http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm.xsd"
xmlns:int="http://www.springframework.org/schema/integration"
xmlns:oxm="http://www.springframework.org/schema/oxm"
xmlns:int-http="http://www.springframework.org/schema/integration/http">
<int:annotation-config/>
<!-- Inbound/Outbound Channels -->
<int:channel id="employeeSearchRequest" />
<int:channel id="employeeSearchResponse" />
<int:channel id="userSearchRequest" />
<int:channel id="userSearchResponse" />
<int-http:inbound-gateway id="inboundEmployeeSearchRequestGateway"
supported-methods="GET, POST"
request-channel="employeeSearchRequest"
reply-channel="employeeSearchResponse"
mapped-response-headers="Return-Status, Return-Status-Msg, HTTP_RESPONSE_HEADERS"
view-name="/employee"
path="/services/employee/{id}/search"
reply-timeout="50000">
<int-http:header name="employeeId" expression="#pathVariables.id"/>
</int-http:inbound-gateway>
<int-http:inbound-gateway id="inboundUserSearchRequestGateway"
supported-methods="GET, POST"
request-channel="userSearchRequest"
reply-channel="userSearchResponse"
mapped-response-headers="Return-Status, Return-Status-Msg, HTTP_RESPONSE_HEADERS"
view-name="/users"
path="/users/{id}/search"
reply-timeout="50000">
<int-http:header name="userId" expression="#pathVariables.id"/>
</int-http:inbound-gateway>
<!-- Consume WS Sample -->
<int:channel id="in" />
<int:channel id="out" />
<int-http:outbound-gateway request-channel="in" reply-channel="out"
url="http://echo.jsontest.com/key/value/one/two" http-method="GET"
expected-response-type="java.lang.String">
<int:poller fixed-rate="20000"/>
</int-http:outbound-gateway>
<int:transformer input-channel="in"
output-channel="out" ref="hTTPTransformer" />
<!-- Consume WS Sample Ends -->
<!-- Note: The default parameter name for favorParameter is "format". For instance, when this flag is true, a request for /services/employee/{id}/search?format=json will result
in an MappingJacksonJsonView being resolved, while the Accept header can be the browser-defined text/html,application/xhtml+xml -->
<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="order" value="1" />
<property name="contentNegotiationManager">
<bean class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
<property name="defaultContentType" value="application/json"/>
<property name="favorParameter" value="true"/>
<property name="ignoreAcceptHeader" value="true" />
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
<entry key="xml" value="application/xml" />
</map>
</property>
</bean>
</property>
<property name="defaultViews">
<list>
<bean
class="org.springframework.integration.samples.rest.json.view.ExtendedMappingJacksonJsonView" >
<property name="objectMapper" ref="jaxbJacksonObjectMapper"/>
</bean>
<bean class="org.springframework.web.servlet.view.xml.MarshallingView">
<constructor-arg ref="marshaller"/>
</bean>
</list>
</property>
</bean>
<oxm:jaxb2-marshaller id="marshaller" context-path="org.springframework.integration.samples.rest.domain" />
<int:service-activator id="employeeServiceActivator"
input-channel="employeeSearchRequest"
output-channel="employeeSearchResponse"
ref="employeeSearchService"
method="getEmployee"
requires-reply="true"
send-timeout="60000"/>
<int:service-activator id="userServiceActivator"
input-channel="userSearchRequest"
output-channel="userSearchResponse"
ref="userSearchService"
method="getUsers"
requires-reply="true"
send-timeout="60000"/>
<bean id="jaxbJacksonObjectMapper" class="org.springframework.integration.samples.rest.json.JaxbJacksonObjectMapper"/>
</beans>
有人能告诉我为什么会收到此错误？先谢谢你们！
答案 0 :(得分：1)
第一次更新：对于轮询，添加入站通道适配器
<int-http:outbound-gateway request-channel="in" reply-channel="out"
url="http://echo.jsontest.com/key/value/one/two" http-method="GET"
expected-response-type="java.lang.String">
</int-http:outbound-gateway>
<int:inbound-channel-adapter channel="in" expression="''">
<int:poller fixed-delay="60000"></int:poller>
</int:inbound-channel-adapter>
第二次更新：为了转换对bean的响应，添加了此代码
<int:json-to-object-transformer input-channel="out"
output-channel="testChannel" type="org.springframework.integration.samples.rest.domain.PlaceholderBean"/>
<int:service-activator method="dummyMethod" input-channel="testChannel" ref="dummyService"/>
最后，我能够轮询HTTP服务，获取数据并进行处理！感谢@JensKrogsboell的所有帮助！