加密传输

可以通过HttpClientConfigCallback配置加密传输。 参数org.apache.http.impl.nio.client.HttpAsyncClientBuilder 公开了多个方法来配置加密传输：setSSLContext，setSSLSessionStrategy和setConnectionManager，以下是一个例子：

  2. KeyStore truststore = KeyStore.getInstance("jks");
  3. try (InputStream is = Files.newInputStream(keyStorePath)) {
  4.     truststore.load(is, keyStorePass.toCharArray());
  5. }
  6. SSLContextBuilder sslBuilder = SSLContexts.custom().loadTrustMaterial(truststore, null);
  7. final SSLContext sslContext = sslBuilder.build();
  8. RestClientBuilder builder = RestClient.builder(new HttpHost("localhost", 9200, "https"))
  9.         .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
  10.             @Override
  11.             public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
  12.                 return httpClientBuilder.setSSLContext(sslContext);
  13.             }
  14.         });

如果没有提供明确的配置，则使用系统默认配置。