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>