HttpClient 发送 HTTP、HTTPS 请求的简单封装
import org.apache.commons.io.IOUtils; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; 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.conn.ssl.SSLConnectionSocketFactory; import org.apache.http.conn.ssl.SSLContextBuilder; import org.apache.http.conn.ssl.TrustStrategy; import org.apache.http.conn.ssl.X509HostnameVerifier; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.DefaultHttpClient; 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; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLException; import javax.net.ssl.SSLSession; import javax.net.ssl.SSLSocket; import java.io.IOException; import java.io.InputStream; import java.nio.charset.Charset; import java.security.GeneralSecurityException; import java.security.cert.CertificateException; import java.security.cert.X509Certificate; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; /** * HTTP 请求工具类 * */ public class HttpUtil { private static PoolingHttpClientConnectionManager connMgr; private static RequestConfig requestConfig; private static final int MAX_TIMEOUT = 7000; static { // 设置连接池 connMgr = new PoolingHttpClientConnectionManager(); // 设置连接池大小 connMgr.setMaxTotal(100); connMgr.setDefaultMaxPerRoute(connMgr.getMaxTotal()); RequestConfig.Builder configBuilder = RequestConfig.custom(); // 设置连接超时 configBuilder.setConnectTimeout(MAX_TIMEOUT); // 设置读取超时 configBuilder.setSocketTimeout(MAX_TIMEOUT); // 设置从连接池获取连接实例的超时 configBuilder.setConnectionRequestTimeout(MAX_TIMEOUT); // 在提交请求之前 测试连接是否可用 configBuilder.setStaleConnectionCheckEnabled(true); requestConfig = configBuilder.build(); } /** * 发送 GET 请求（HTTP），不带输入数据 * * @param url * @return */ public static String doGet(String url) { return doGet(url, new HashMap<String, Object>()); } /** * 发送 GET 请求（HTTP），K-V形式 * * @param url * @param params * @return */ public static String doGet(String url, Map<String, Object> params) { String apiUrl = url; StringBuffer param = new StringBuffer(); int i = 0; for (String key : params.keySet()) { if (i == 0) param.append("?"); else param.append("&"); param.append(key).append("=").append(params.get(key)); i++; } apiUrl += param; String result = null; CloseableHttpClient httpclient = HttpClients.createDefault(); //创建具有默认配置的CloseableHttpClient实例 try { HttpGet httpPost = new HttpGet(apiUrl); CloseableHttpResponse response = httpclient.execute(httpPost); int statusCode = response.getStatusLine().getStatusCode(); System.out.println("执行状态码 : " + statusCode); HttpEntity entity = response.getEntity(); if (entity != null) { InputStream instream = entity.getContent(); result = IOUtils.toString(instream, "UTF-8"); } } catch (IOException e) { e.printStackTrace(); } return result; } /** * 发送 POST 请求（HTTP），不带输入数据 * * @param apiUrl * @return */ public static String doPost(String apiUrl) { return doPost(apiUrl, new HashMap<String, Object>()); } /** * 发送 POST 请求（HTTP），K-V形式 * * @param apiUrl API接口URL * @param params 参数map * @return */ public static String doPost(String apiUrl, Map<String, Object> params) { CloseableHttpClient httpClient = HttpClients.createDefault(); String httpStr = null; HttpPost httpPost = new HttpPost(apiUrl); CloseableHttpResponse response = null; try { httpPost.setConfig(requestConfig); List<NameValuePair> pairList = new ArrayList<>(params.size()); for (Map.Entry<String, Object> entry : params.entrySet()) { NameValuePair pair = new BasicNameValuePair(entry.getKey(), entry .getValue().toString()); pairList.add(pair); } httpPost.setEntity(new UrlEncodedFormEntity(pairList, Charset.forName("UTF-8"))); response = httpClient.execute(httpPost); // System.out.println(response.toString()); HttpEntity entity = response.getEntity(); httpStr = EntityUtils.toString(entity, "UTF-8"); } catch (IOException e) { e.printStackTrace(); } finally { if (response != null) { try { EntityUtils.consume(response.getEntity()); } catch (IOException e) { e.printStackTrace(); } } } return httpStr; } /** * 发送 POST 请求（HTTP），JSON形式 * * @param apiUrl * @param json json对象 * @return */ public static String doPost(String apiUrl, Object json) { CloseableHttpClient httpClient = HttpClients.createDefault(); String httpStr = null; HttpPost httpPost = new HttpPost(apiUrl); CloseableHttpResponse response = null; try { httpPost.setConfig(requestConfig); StringEntity stringEntity = new StringEntity(json.toString(), "UTF-8");//解决中文乱码问题 stringEntity.setContentEncoding("UTF-8"); stringEntity.setContentType("application/json"); httpPost.setEntity(stringEntity); response = httpClient.execute(httpPost); HttpEntity entity = response.getEntity(); System.out.println(response.getStatusLine().getStatusCode()); httpStr = EntityUtils.toString(entity, "UTF-8"); } catch (IOException e) { e.printStackTrace(); } finally { if (response != null) { try { EntityUtils.consume(response.getEntity()); } catch (IOException e) { e.printStackTrace(); } } } return httpStr; } /** * 发送 SSL POST 请求（HTTPS），K-V形式 * * @param apiUrl API接口URL * @param params 参数map * @return */ public static String doPostSSL(String apiUrl, Map<String, Object> params) { CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory()).setConnectionManager(connMgr).setDefaultRequestConfig(requestConfig).build(); HttpPost httpPost = new HttpPost(apiUrl); CloseableHttpResponse response = null; String httpStr = null; try { httpPost.setConfig(requestConfig); List<NameValuePair> pairList = new ArrayList<NameValuePair>(params.size()); for (Map.Entry<String, Object> entry : params.entrySet()) { NameValuePair pair = new BasicNameValuePair(entry.getKey(), entry .getValue().toString()); pairList.add(pair); } httpPost.setEntity(new UrlEncodedFormEntity(pairList, Charset.forName("utf-8"))); response = httpClient.execute(httpPost); int statusCode = response.getStatusLine().getStatusCode(); if (statusCode != HttpStatus.SC_OK) { return null; } HttpEntity entity = response.getEntity(); if (entity == null) { return null; } httpStr = EntityUtils.toString(entity, "utf-8"); } catch (Exception e) { e.printStackTrace(); } finally { if (response != null) { try { EntityUtils.consume(response.getEntity()); } catch (IOException e) { e.printStackTrace(); } } } return httpStr; } /** * 发送 SSL POST 请求（HTTPS），JSON形式 * * @param apiUrl API接口URL * @param json JSON对象 * @return */ public static String doPostSSL(String apiUrl, Object json) { CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory()).setConnectionManager(connMgr).setDefaultRequestConfig(requestConfig).build(); HttpPost httpPost = new HttpPost(apiUrl); CloseableHttpResponse response = null; String httpStr = null; try { httpPost.setConfig(requestConfig); StringEntity stringEntity = new StringEntity(json.toString(), "UTF-8");//解决中文乱码问题 stringEntity.setContentEncoding("UTF-8"); stringEntity.setContentType("application/json"); httpPost.setEntity(stringEntity); response = httpClient.execute(httpPost); int statusCode = response.getStatusLine().getStatusCode(); if (statusCode != HttpStatus.SC_OK) { return null; } HttpEntity entity = response.getEntity(); if (entity == null) { return null; } httpStr = EntityUtils.toString(entity, "utf-8"); } catch (Exception e) { e.printStackTrace(); } finally { if (response != null) { try { EntityUtils.consume(response.getEntity()); } catch (IOException e) { e.printStackTrace(); } } } return httpStr; } /** * 创建SSL安全连接 * * @return */ private static SSLConnectionSocketFactory createSSLConnSocketFactory() { SSLConnectionSocketFactory sslsf = null; try { SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() { public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException { return true; } }).build(); sslsf = new SSLConnectionSocketFactory(sslContext, new X509HostnameVerifier() { @Override public boolean verify(String arg0, SSLSession arg1) { return true; } @Override public void verify(String host, SSLSocket ssl) throws IOException { } @Override public void verify(String host, X509Certificate cert) throws SSLException { } @Override public void verify(String host, String[] cns, String[] subjectAlts) throws SSLException { } }); } catch (GeneralSecurityException e) { e.printStackTrace(); } return sslsf; } /** * 测试方法 * * @param args */ public static void main(String[] args) throws Exception { } }
参考：http://blog.csdn.net/happylee6688/article/details/47148227
