配置使用连接池的httpClient

httpClient4.3开始弃用了DefaultHttpClient和PoolingClientConnectionManager.原来这样配置的连接工厂

<bean id="clientHttpRequestFactory"
		class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory"><constructor-arg><bean class="org.apache.http.impl.client.DefaultHttpClient"><constructor-arg><bean class="org.apache.http.impl.conn.PoolingClientConnectionManager"><property name="maxTotal" value="10" /><property name="defaultMaxPerRoute" value="5" /></bean></constructor-arg></bean></constructor-arg><property name="connectTimeout" value="30000" /><property name="readTimeout" value="30000" /></bean>

现在改用spring推荐的类,配置如下:

<bean id="pollingConnectionManager"
		class="org.apache.http.impl.conn.PoolingHttpClientConnectionManager"><property name="maxTotal" value="10" /><property name="defaultMaxPerRoute" value="5" /></bean><bean id="httpClientBuilder" class="org.apache.http.impl.client.HttpClientBuilder"
		factory-method="create"><property name="connectionManager" ref="pollingConnectionManager" /></bean><bean id="httpClient" factory-bean="httpClientBuilder"
		factory-method="build" /><!-- --><bean id="clientHttpRequestFactory"
		class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory"><constructor-arg ref="httpClient" /><property name="connectTimeout" value="30000" /><property name="readTimeout" value="30000" /></bean>

  配置带有连接池的org.springframework.web.client.RestTemplate

<bean id="restTemplate" class="org.springframework.web.client.RestTemplate"><constructor-arg ref="clientHttpRequestFactory" /><property name="messageConverters"><list><bean
					class="org.springframework.http.converter.StringHttpMessageConverter" /><bean
					class="org.springframework.http.converter.xml.SourceHttpMessageConverter" /><bean class="org.springframework.http.converter.FormHttpMessageConverter" /><bean
					class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" /><bean
					class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter" /></list></property></bean>