如何获得HiveMQ客户机中使用的密码套件？

Question

我将HiveMQ服务器配置为识别TLS，并创建了一个TLS通信。我想打印出正在使用的密码套件。我使用了getSslConfig()，但最后得到的输出是：

可选[com.hivemq.client.internal.mqtt.mqttclientsslconfigimpl@2710]

Mqtt5BlockingClient subscriber = Mqtt5Client.builder()
        .identifier(UUID.randomUUID().toString()) // the unique identifier of the MQTT client. The ID is randomly generated between 
        .serverHost("localhost")  // the host name or IP address of the MQTT server. Kept it localhost for testing. localhost is default if not specified.
        .serverPort(8883)  // specifies the port of the server
        .addConnectedListener(context -> ClientConnectionRetreiver.printConnected("Subscriber1"))        // prints a string that the client is connected
        .addDisconnectedListener(context -> ClientConnectionRetreiver.printDisconnected("Subscriber1"))  // prints a string that the client is disconnected
        .sslWithDefaultConfig()  // << How can I specify a particular cipher suite?
        .buildBlocking();  // creates the client builder

Mqtt5ClientConfig clientConfig = client.getConfig();
System.out.println(" Ssl Configuration: " + clientConfig.getSslConfig());

Answer 1

Mqtt5Client.builder()
        ...
        .sslConfig()
            .cipherSuites(Arrays.asList("TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"))
            .applySslConfig()
        ...

GetSSLConfig返回一个可选。为了得到密码套件：

client.getConfig().getSslConfig().get().getCipherSuites()