在apache httpclient 4.3版本中对很多旧的类进行了deprecated标注，通常比较常用的就是下面两个类了。

DefaultHttpClient —> CloseableHttpClient

HttpResponse —> CloseableHttpResponse

目前互联网对外提供的接口通常都是HTTPS协议，有时候接口提供方所示用的证书会出现证书不受信任的提示，chrome访问接口（通常也不会用chrome去访问接口，只是举个例子）会出现这样的提示：

为此我们调用这类接口的时候就要忽略掉证书认证信息，我们调用接口的httpClient就要做特殊处理。下面记录下httpclient 4.3以前和之后的httpClient获取方法。

httpclient jar包4.3以前版本获取HttpClient方法如下：

1 public static HttpClient getHttpClient(HttpClient base) { 2         try { 3             SSLContext ctx = SSLContext.getInstance("SSL"); 4             X509TrustManager tm = new X509TrustManager() { 5                 public java.security.cert.X509Certificate[] getAcceptedIssuers() { 6                     return null; 7                 } 8  9                 @Override10                 public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {11                 }12 13                 @Override14                 public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {15                 }16             };17 18             ctx.init(null, new TrustManager[] {tm}, null);19             SSLSocketFactory ssf = new SSLSocketFactory(ctx, SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);20             ClientConnectionManager mgr = base.getConnectionManager();21             SchemeRegistry registry = mgr.getSchemeRegistry();22             registry.register(new Scheme("https", 443, ssf));23             return new DefaultHttpClient(mgr, base.getParams());24         } catch (Exception e) {25             log.warn("{}", e);26             return null;27         }28     }

httpclient jar包4.3之后版本获取HttpClient方法如下：

1 public static CloseableHttpClient getHttpClient() { 2         try { 3             SSLContext sslContext = SSLContext.getInstance("SSL"); 4             sslContext.init(null, new TrustManager[] {
   new X509TrustManager() { 5                 @Override 6                 public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException { 7  8                 } 9 10                 @Override11                 public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {12 13                 }14 15                 @Override16                 public X509Certificate[] getAcceptedIssuers() {17                     return new X509Certificate[0];18                 }19             }}, new SecureRandom());20             SSLConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(sslContext, NoopHostnameVerifier.INSTANCE);21             CloseableHttpClient closeableHttpClient = HttpClientBuilder.create().setSSLSocketFactory(socketFactory).build();22             return closeableHttpClient;23         } catch (Exception e) {24             log.warn("create closeable http client failed!");25             return HttpClientBuilder.create().build();26         }27     }