【SpringBoot】在Springboot中怎么设置Kafka自动创建Topic

我们在开发过程中使用Kafka会遇到topic太多，自己创建太费劲，所以想一次配置终身使用，自己去创建topic，和flyway一样自己去创建表，今天总结一下配置方式。

1.application.yml配置

kafka:
  # 自动创建topic
  topics:
    # topic
    - name: import_vulnera_topic
      #分区数
      num-partitions: 6
      #副本数
      replication-factor: 2
    #  topic
    - name: import_vulnerability_topic
      num-partitions: 6
      replication-factor: 2
    # topic
    - name: import_vulnerability_result_topic
      num-partitions: 6
      replication-factor: 2

2.配置Configuration

import org.apache.kafka.clients.admin.NewTopic;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.support.GenericWebApplicationContext;

import javax.annotation.PostConstruct;
import java.util.List;


/**
 * 自动创建topic
 */
@Configuration
@SuppressWarnings("all")
public class TopicAdministrator {
    private final TopicConfigurations configurations;
    private final GenericWebApplicationContext context;

    public TopicAdministrator(TopicConfigurations configurations, GenericWebApplicationContext genericContext) {
        this.configurations = configurations;
        this.context = genericContext;
    }

    @PostConstruct
    public void init() {
        initializeBeans(configurations.getTopics());
    }

    private void initializeBeans(List topics) {
        topics.forEach(t -> context.registerBean(t.name, NewTopic.class, t::toNewTopic));
    }


}

import lombok.Data;
import org.apache.kafka.clients.admin.NewTopic;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;

import java.util.List;

@Configuration
@ConfigurationProperties(prefix = "kafka")
@Data
public class TopicConfigurations {

    private List topics;

    @Data
    static class Topic {
        String name;
        Integer numPartitions = 3;
        Short replicationFactor = 1;

        NewTopic toNewTopic() {
            return new NewTopic(this.name, this.numPartitions, this.replicationFactor);
        }

    }
}

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