keytool -genkey -keyalg RSA -alias mykey -keystore keystore.jks -validity 365 -keysize 2048 SSLContext sslContext = SSLContexts.custom() .loadTrustMaterial(new File("keystore.jks"), "password".toCharArray()) .build(); SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext); CloseableHttpClient httpClient = HttpClientBuilder.create() .setSSLSocketFactory(sslsf) .build(); HttpPost httpPost = new HttpPost("https://example.com/api"); httpPost.setEntity(new StringEntity("request body")); CloseableHttpResponse response = httpClient.execute(httpPost); int statusCode = response.getStatusLine().getStatusCode(); String responseBody = EntityUtils.toString(response.getEntity()); response.close(); httpClient.close();