springboot kafka connect

Spring Boot Kafka Connect是一种用于连接Kafka和其他数据源的框架。它允许您使用Kafka Connect API将数据从其他数据源（例如数据库，文件系统等）连接到Kafka集群中。以下是使用Spring Boot Kafka Connect的步骤：

1.添加依赖项

<dependency>
    <groupId>org.springframework.kafka</groupId>
    <artifactId>spring-kafka</artifactId>
</dependency>

2.创建Kafka连接器配置

@Configuration
public class KafkaConnectConfig {

    @Value("${kafka.bootstrap-servers}")
    private String bootstrapServers;

    @Bean
    public Map<String, String> kafkaConnectConfigs() {
        Map<String, String> props = new HashMap<>();
        props.put("bootstrap.servers", bootstrapServers);
        props.put("key.converter", "org.apache.kafka.connect.json.JsonConverter");
        props.put("value.converter", "org.apache.kafka.connect.json.JsonConverter");
        props.put("key.converter.schemas.enable", "false");
        props.put("value.converter.schemas.enable", "false");
        return props;
    }
}

3.创建Kafka连接器

@Component
public class MyKafkaConnector {

    @Autowired
    private KafkaConnectConfig kafkaConnectConfig;

    public void start() {
        Map<String, String> props = kafkaConnectConfig.kafkaConnectConfigs();
        props.put("name", "my-connector");
        props.put("connector.class", "io.confluent.connect.jdbc.JdbcSourceConnector");
        props.put("connection.url", "jdbc:mysql://localhost:3306/mydb");
        props.put("connection.user", "root");
        props.put("connection.password", "password");
        props.put("topic.prefix", "my-topic-");
        props.put("mode", "incrementing");
        props.put("incrementing.column.name", "id");
        props.put("table.whitelist", "mytable");
        props.put("tasks.max", "1");

        KafkaConnectRunner runner = new KafkaConnectRunner(props);
        runner.start();
    }
}

4.运行Kafka连接器

public class KafkaConnectRunner {

    private final RestTemplate restTemplate = new RestTemplate();

    private final String baseUrl;

    public KafkaConnectRunner(Map<String, String> props) {
        String bootstrapServers = props.get("bootstrap.servers");
        this.baseUrl = "http://" + bootstrapServers.split(",")[0] + ":8083/connectors";
    }

    public void start() {
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);

        HttpEntity<String> entity = new HttpEntity<>(toJsonString(), headers);

        restTemplate.exchange(baseUrl, HttpMethod.POST, entity, String.class);
    }

    private String toJsonString() {
        ObjectMapper mapper = new ObjectMapper();
        ObjectNode json = mapper.createObjectNode();
        json.put("name", props.get("name"));
        json.put("config", mapper.valueToTree(props));
        return json.toString();
    }
}