flink sql 连 ssl kafka demo

好的，下面是使用Flink SQL连接SSL Kafka的示例代码：

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.EnvironmentSettings;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
import org.apache.flink.table.descriptors.*;
import org.apache.flink.types.Row;

public class SSLKafkaDemo {

    public static void main(String[] args) throws Exception {

        // set up the execution environment
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        StreamTableEnvironment tableEnv = StreamTableEnvironment.create(env, EnvironmentSettings.newInstance().useBlinkPlanner().inStreamingMode().build());

        // set up the Kafka connector properties
        final String topic = "test-topic";
        final String kafkaBootstrapServers = "kafka-broker-1:9092,kafka-broker-2:9092,kafka-broker-3:9092";
        final String kafkaSecurityProtocol = "SSL";
        final String kafkaSslTruststoreLocation = "/path/to/kafka.client.truststore.jks";
        final String kafkaSslTruststorePassword = "password";

        // set up the Kafka connector descriptor
        Kafka kafka = new Kafka()
                .version("universal")
                .topic(topic)
                .property("bootstrap.servers", kafkaBootstrapServers)
                .property("security.protocol", kafkaSecurityProtocol)
                .property("ssl.truststore.location", kafkaSslTruststoreLocation)
                .property("ssl.truststore.password", kafkaSslTruststorePassword);

        // set up the schema of the Kafka connector
        Schema schema = new Schema()
                .field("key", DataTypes.STRING())
                .field("value", DataTypes.STRING())
                .field("timestamp", DataTypes.BIGINT());

        // set up the format of the Kafka connector
        Json json = new Json()
                .failOnMissingField(false)
                .deriveSchema();

        // create the Kafka table and register it in the table environment
        tableEnv
                .connect(kafka)
                .withSchema(schema)
                .withFormat(json)
                .createTemporaryTable("kafka_table");

        // execute a SQL query on the Kafka table
        Table result = tableEnv.sqlQuery("SELECT * FROM kafka_table WHERE key = 'foo'");

        // print the result of the query
        tableEnv.toRetractStream(result, Row.class).print();

        // execute the Flink job
        env.execute();
    }
}

请确保将`kafkaSecurityProtocol`设置为`SSL`，并提供SSL证书的路径和密码。此外，还需要配置`Json`格式以从Kafka接收和发送数据。