通過Spring

Question

注入RestTemplate我有這部分代碼爲例：

public SapRestClient(final String scheme, final String host, 
    final int port, final String username, final String password, 
    final HttpClientConnectionManager connectionManager, 
    final RequestConfig requestConfig) { 

final BasicCredentialsProvider credentialsProvider = 
    new BasicCredentialsProvider(); 
credentialsProvider.setCredentials(authscope, credentials); 

final CloseableHttpClient httpClient = 
    HttpClientBuilder.create().setDefaultCredentialsProvider(credentialsProvider) 
    .setConnectionManager(connectionManager) 
    .setDefaultRequestConfig(requestConfig).build(); 

final HttpComponentsClientHttpRequestFactory requestFactory = 
    new HttpComponentsClientHttpRequestFactory(httpClient); 
final BufferingClientHttpRequestFactory bufferingRequestFactory = 
    new BufferingClientHttpRequestFactory(requestFactory; 
this.restTemplate = new RestTemplate(bufferingRequestFactory); 

我會做這樣的事情在春天。我寫了這個代碼：

<bean id="requestConfigBuilder" class="org.apache.http.client.config.RequestConfig" 
     factory-method="custom"> 
     <property name="socketTimeout" value="5000" /> 
     <property name="connectTimeout" value="5000" /> 
    </bean> 

    <bean id="requestConfig" factory-bean="requestConfigBuilder" 
     factory-method="build" /> 

    <bean id="connectionManager" 
     class="org.apache.http.conn.HttpClientConnectionManager"> 
     <property name="maxTotal" value="30" /> 
     <property name="defaultMaxPerRoute" value="50" /> 
    </bean> 

    <bean id="credentialsProvider" class="org.apache.commons.httpclient.auth.CredentialsProvider"/> 


    <bean id="httpClientBuilder" class="org.apache.http.impl.client.HttpClientBuilder" 
     factory-method="create"> 
     <property name="defaultRequestConfig" ref="requestConfig" /> 
     <property name="defaultConnectionManager" ref="connectionManager"/> 
     <property name="defaultCredentialsProvider" ref="credentialsProvider"/> 
    </bean> 

    <bean id="httpClient" factory-bean="httpClientBuilder" 
     factory-method="build" /> 

    <bean id="requestFactory" factory-bean="httpComponentsClientHttpRequestFactory"> 
     <property name="defaultHttpClient" ref="httpClient"/> 
    </bean> 

    <bean id="bufferingRequestFactory" factory-bean="bufferingClientHttpRequestFactory"> 
     <property name="defaultRequestFactory" ref="requestFactory"/> 
    </bean> 

    <bean id="bufferingClientHttpRequestFactory" class="org.springframework.http.client.BufferingClientHttpRequestFactory"/> 

    <bean id="twRestTemplate" class="org.springframework.web.client.RestTemplate"> 
     <constructor-arg> 
      <ref bean="bufferingRequestFactory" /> 
     </constructor-arg> 
     <property name="errorHandler" ref="customErrorHandler" /> 
    </bean> 

，我把的ConnectionManager（帶連接設置），以及在closeableHttpClient超時管理的要求配置器（我看到這個鏈接）。我把這個bean放在HttpComponentClientHttpRequestFactory中，然後放在BufferingRequestFactory中，最後放在RestTemplate中。

但在運行時我得到這個錯誤：

WARN [localhost-startStop-1] [CloseAwareApplicationContext] Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'defaultTwProductSearchService' defined in class path resource [jkdsfj-spring.xml]: Cannot resolve reference to bean 'twNavigatorClientGateway' while setting bean property 'twNavigatorClientGateway'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'defaultTwNavigatorClientGateway' defined in class path resource [jkdsfj-spring.xml]: Cannot resolve reference to bean 'twRestTemplate' while setting bean property 'twRestTemplate'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'twRestTemplate' defined in class path resource [joggrouptwconnector-spring.xml]: Cannot resolve reference to bean 'bufferingRequestFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bufferingRequestFactory' defined in class path resource [jkdsfj-spring.xml]: Instantiation of bean failed; nested exception is java.lang.IllegalStateException: No bean class specified on bean definition

我哪裏錯了？

Answer 1

不確定你使用的是什麼版本的spring-web。我看過spring-web.4.x。 BufferingClientHttpRequestFactory接受構造函數參數。所以，你可以使用構造帶參數的

<bean id="bufferingRequestFactory" class="org.springframework.http.client.BufferingClientHttpRequestFactory"/> 
    <constructor-arg> 
     <ref bean="requestFactory" /> 
    </constructor-arg> 
</bean> 

您可能必須爲HttpCompnentsClientHttpRequestFactory做同樣創建一個不帶豆。