java中httpclient工具SSLContextImpl is not initialized异常解决

刚开始的代码如下：

SSLContext sslContext = SSLContext.getInstance("SSL");SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext,new String[] {"TLSv1"}, null,SSLConnectionSocketFactory.getDefaultHostnameVerifier());

执行后异常：

java.lang.IllegalStateException: SSLContextImpl is not initialized

at sun.security.ssl.SSLContextImpl.engineGetSocketFactory(SSLContextImpl.java:172)

at javax.net.ssl.SSLContext.getSocketFactory(SSLContext.java:294)

at org.apache.http.conn.ssl.SSLConnectionSocketFactory.<init>(SSLConnectionSocketFactory.java:275)

解决办法如下：

SSLContextBuilder sslContextBuilder = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {
   public boolean isTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
      return true;
   }
});
SSLContext sslContext =sslContextBuilder.build();

SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext,
      new String[]{"TLSv1.1", "SSLv3", "TLSv1", "TLSv1.2"},
      null, NoopHostnameVerifier.INSTANCE);