Amazon MQ客户端使用TLSv1.2版本连接到代理商。以下是一个使用Java语言编写的Amazon MQ客户端示例代码，该代码使用TLSv1.2版本连接到代理商：

import software.amazon.awssdk.services.mq.MqClient;
import software.amazon.awssdk.services.mq.model.CreateBrokerRequest;
import software.amazon.awssdk.services.mq.model.CreateBrokerResponse;
import software.amazon.awssdk.services.mq.model.EngineType;
import software.amazon.awssdk.services.mq.model.BrokerInstanceType;
import software.amazon.awssdk.services.mq.model.Tls;
import software.amazon.awssdk.services.mq.model.User;

public class AmazonMQClientExample {
    public static void main(String[] args) {
        // 设置TLS版本
        System.setProperty("https.protocols", "TLSv1.2");

        // 创建Amazon MQ客户端
        MqClient mqClient = MqClient.builder().build();

        // 创建代理商请求
        CreateBrokerRequest createBrokerRequest = CreateBrokerRequest.builder()
                .brokerName("example-broker")
                .engineType(EngineType.ACTIVEMQ)
                .engineVersion("5.15.9")
                .hostInstanceType(BrokerInstanceType.T2_MICRO)
                .publiclyAccessible(false)
                .users(User.builder()
                        .username("admin")
                        .password("admin123")
                        .build())
                .tls(Tls.builder()
                        .certificateAuthorityArn("arn:aws:acm:us-west-2:123456789012:certificate/12345678-1234-1234-1234-123456789012")
                        .build())
                .build();

        // 创建代理商
        CreateBrokerResponse createBrokerResponse = mqClient.createBroker(createBrokerRequest);
        System.out.println("Broker ARN: " + createBrokerResponse.brokerArn());

        // 关闭Amazon MQ客户端
        mqClient.close();
    }
}

在示例代码中，通过设置系统属性https.protocols为TLSv1.2，确保客户端使用TLSv1.2版本连接到代理商。