HTTP连接池

　　　　 <context:property-placeholder location="classpath:conf/framework/httpclient.properties"/>

	<!-- 定义连接管理器 -->

	<bean id="httpClientConnectionManager"

		class="org.apache.http.impl.conn.PoolingHttpClientConnectionManager"

		destroy-method="close">

		<!-- 最大连接数 -->

		<property name="maxTotal" value="${http.maxTotal}" />

		<!-- 设置每个主机地址的并发数 -->

		<property name="defaultMaxPerRoute" value="${http.defaultMaxPerRoute}" />

	</bean>

	<!-- httpclient对象构建器 -->

	<bean id="httpClientBuilder" class="org.apache.http.impl.client.HttpClientBuilder">

		<!-- 设置连接管理器 -->

		<property name="connectionManager" ref="httpClientConnectionManager" />

	</bean>

	<!-- 定义Httpclient对象 -->

	<bean id="httpClient" class="org.apache.http.impl.client.CloseableHttpClient"

		factory-bean="httpClientBuilder" factory-method="build" scope="prototype">

	</bean>

	<!-- 定义清理无效连接 -->

	<bean class="com.avcon.platform.dledc.res.service.IdleConnectionEvictor"

		destroy-method="shutdown">

		<constructor-arg index="0" ref="httpClientConnectionManager" />

	</bean>

	<bean id="requestConfigBuilder" class="org.apache.http.client.config.RequestConfig.Builder">

		<!-- 创建连接的最长时间 -->

		<property name="connectTimeout" value="${http.connectTimeout}"/>

		<!-- 从连接池中获取到连接的最长时间 -->

		<property name="connectionRequestTimeout" value="${http.connectionRequestTimeout}"/>

		<!-- 数据传输的最长时间 -->

		<property name="socketTimeout" value="${http.socketTimeout}"/>

		<!-- 提交请求前测试连接是否可用 -->

		<property name="staleConnectionCheckEnabled" value="${http.staleConnectionCheckEnabled}"/>

	</bean>

	<!-- 定义请求参数 -->

	<bean id="requestConfig" class="org.apache.http.client.config.RequestConfig" factory-bean="requestConfigBuilder" factory-method="build">

	</bean>

@Service

public class HttpClientService {

	@Autowired

	private CloseableHttpClient httpClient;

	@Autowired

	private RequestConfig requestConfig;

	/**

	 * 执行GET请求

	 *

	 * @param url

	 * @return

	 * @throws IOException

	 * @throws ClientProtocolException

	 */

	public String doGet(String url) throws ClientProtocolException, IOException {

		// 创建http GET请求

		HttpGet httpGet = new HttpGet(url);

		httpGet.setConfig(this.requestConfig);

		CloseableHttpResponse response = null;

		try {

			// 执行请求

			response = httpClient.execute(httpGet);

			// 判断返回状态是否为200

			if (response.getStatusLine().getStatusCode() == 200) {

				return EntityUtils.toString(response.getEntity(), "UTF-8");

			}

		} finally {

			if (response != null) {

				response.close();

			}

		}

		return null;

	}

	/**

	 * 带有参数的GET请求

	 *

	 * @param url

	 * @param params

	 * @return

	 * @throws URISyntaxException

	 * @throws IOException

	 * @throws ClientProtocolException

	 */

	public String doGet(String url, Map<String, String> params)

			throws ClientProtocolException, IOException, URISyntaxException {

		URIBuilder uriBuilder = new URIBuilder(url);

		for (String key : params.keySet()) {

			uriBuilder.addParameter(key, params.get(key));

		}

		return this.doGet(uriBuilder.build().toString());

	}

	/**

	 * 执行POST请求

	 *

	 * @param url

	 * @param params

	 * @return

	 * @throws IOException

	 */

	public HttpResult doPost(String url, Map<String, String> params) throws IOException {

		// 创建http POST请求

		HttpPost httpPost = new HttpPost(url);

		httpPost.setConfig(this.requestConfig);

		if (params != null) {

			// 设置2个post参数，一个是scope、一个是q

			List<NameValuePair> parameters = new ArrayList<NameValuePair>();

			for (String key : params.keySet()) {

				parameters.add(new BasicNameValuePair(key, params.get(key)));

			}

			// 构造一个form表单式的实体

			UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters, "UTF-8");

			// 将请求实体设置到httpPost对象中

			httpPost.setEntity(formEntity);

		}

		CloseableHttpResponse response = null;

		try {

			// 执行请求

			response = httpClient.execute(httpPost);

			return new HttpResult(response.getStatusLine().getStatusCode(),

					EntityUtils.toString(response.getEntity(), "UTF-8"));

		} finally {

			if (response != null) {

				response.close();

			}

		}

	}

	/**

	 * 执行POST请求

	 *

	 * @param url

	 * @return

	 * @throws IOException

	 */

	public HttpResult doPost(String url) throws IOException {

		return this.doPost(url, null);

	}

	/**

	 * 提交json数据

	 *

	 * @param url

	 * @param json

	 * @return

	 * @throws ClientProtocolException

	 * @throws IOException

	 */

	public HttpResult doPostJson(String url, String json) throws ClientProtocolException, IOException {

		// 创建http POST请求

		HttpPost httpPost = new HttpPost(url);

		httpPost.setConfig(this.requestConfig);

		if (json != null) {

			// 构造一个form表单式的实体

			StringEntity stringEntity = new StringEntity(json, ContentType.APPLICATION_JSON);

			// 将请求实体设置到httpPost对象中

			httpPost.setEntity(stringEntity);

		}

		CloseableHttpResponse response = null;

		try {

			// 执行请求

			response = this.httpClient.execute(httpPost);

			return new HttpResult(response.getStatusLine().getStatusCode(),

					EntityUtils.toString(response.getEntity(), "UTF-8"));

		} finally {

			if (response != null) {

				response.close();

			}

		}

	}