如何使用HttpClient 4.5实现连接池配置示例？

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javaHttpClient工具类import java.io.IOException;import java.net.URI;import java.security.NoSuchAlgorithmException;import java.util.ArrayList;import java.util.List;import java.util.Map;import javax.net.ssl.SSLContext;import org.apache.http.Co

import java.io.IOException; import java.net.URI; import java.security.NoSuchAlgorithmException; import java.util.ArrayList; import java.util.List; import java.util.Map; import javax.net.ssl.SSLContext; import org.apache.http.Consts; import org.apache.http.NameValuePair; import org.apache.http.client.config.RequestConfig; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.utils.URIBuilder; import org.apache.http.config.Registry; import org.apache.http.config.RegistryBuilder; import org.apache.http.conn.socket.ConnectionSocketFactory; import org.apache.http.conn.socket.LayeredConnectionSocketFactory; import org.apache.http.conn.socket.PlainConnectionSocketFactory; import org.apache.http.conn.ssl.SSLConnectionSocketFactory; import org.apache.http.entity.ContentType; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; public class HttpClientUtil { private static PoolingHttpClientConnectionManager connManager = null; static{ LayeredConnectionSocketFactory sslsf = null; try { sslsf = new SSLConnectionSocketFactory(SSLContext.getDefault()); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } Registry socketFactoryRegistry = RegistryBuilder. create() .register("http", PlainConnectionSocketFactory.getSocketFactory()) .register("https", sslsf) .build(); connManager =new PoolingHttpClientConnectionManager(socketFactoryRegistry); connManager.setMaxTotal(200); connManager.setDefaultMaxPerRoute(50); } private static CloseableHttpClient getHttpClient() { RequestConfig requestConfig = RequestConfig.custom() .setConnectTimeout(3000) // 连接超时 .setSocketTimeout(3000) // 数据读取超时 .setConnectionRequestTimeout(5000) // 从连接池获取连接的超时时间 .build(); CloseableHttpClient httpClient = HttpClients.custom() .setConnectionManager(connManager) .setDefaultRequestConfig(requestConfig) .build(); return httpClient; } private HttpClientUtil() {}; public static String doGet(String url, Map params) { // 创建Httpclient对象 CloseableHttpClient httpClient = getHttpClient(); String resultString = ""; CloseableHttpResponse response = null; try { // 创建uri URIBuilder builder = new URIBuilder(url); if (params != null) { for (String key : params.keySet()) { builder.addParameter(key, params.get(key)); } } URI uri = builder.build(); // 创建http GET请求 HttpGet httpGet = new HttpGet(uri); // 执行请求 response = httpClient.execute(httpGet); // 判断返回状态是否为200 if (response.getStatusLine().getStatusCode() == 200) { resultString = EntityUtils.toString(response.getEntity(), Consts.UTF_8); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (response != null) { response.close(); } } catch (IOException e) { e.printStackTrace(); } } return resultString; } public static String doGet(String url) { return doGet(url, null); } public static String doPost(String url, Map params) { // 创建Httpclient对象 CloseableHttpClient httpClient = getHttpClient(); CloseableHttpResponse response = null; String resultString = ""; try { // 创建Http Post请求 HttpPost httpPost = new HttpPost(url); // 创建参数列表 if (params != null) { List paramList = new ArrayList<>(); for (String key : params.keySet()) { paramList.add(new BasicNameValuePair(key, params.get(key))); } // 模拟表单 UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,Consts.UTF_8); httpPost.setEntity(entity); } // 执行http请求 response = httpClient.execute(httpPost); resultString = EntityUtils.toString(response.getEntity(), Consts.UTF_8); } catch (Exception e) { e.printStackTrace(); } finally { try { if (response != null) { response.close(); } } catch (IOException e) { e.printStackTrace(); } } return resultString; } public static String doPost(String url) { return doPost(url, null); } public static String doPostJson(String url, String json) { // 创建Httpclient对象 CloseableHttpClient httpClient = getHttpClient(); CloseableHttpResponse response = null; String resultString = ""; try { // 创建Http Post请求 HttpPost httpPost = new HttpPost(url); // 创建请求内容 StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON); httpPost.setEntity(entity); // 执行http请求 response = httpClient.execute(httpPost); resultString = EntityUtils.toString(response.getEntity(), Consts.UTF_8); } catch (Exception e) { e.printStackTrace(); } finally { try { if (response != null) { response.close(); } } catch (IOException e) { e.printStackTrace(); } } return resultString; } }