Kafka 实战演练：创建、配置与测试 Kafka全面教程

1.配置文件

1. Yml配置

spring:
  kafka:
    bootstrap-servers: 
    consumer:
      group-id: iot-testaaaaaaaaaa11aaaaaaaaa
      auto-offset-reset: earliest
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
    properties:
      security:
        protocol: SASL_SSL
      sasl:
        mechanism: PLAIN
        jaas:
          config: org.apache.kafka.common.security.plain.PlainLoginModule required 
              username="" 
              password="";
      ssl:
        truststore:
          type: JKS
          location: src/main/resources/client.truststore.jks
          password: 
        endpoint.identification.algorithm:

2.消费者

1.注解方式

    @KafkaListener(topics = {"abcd"})
    public void listen(ConsumerRecord<?, ?> record){

        Optional<?> kafkaMessage = Optional.ofNullable(record.value());

        if (kafkaMessage.isPresent()) {

            Object message = kafkaMessage.get();
            System.out.println("---->"+record);
            System.out.println("---->"+message);

        }

    }

2.KafkaConsumer

/**
 * @author XHao
 */
public class MqsConsumer {

    public static final String CONFIG_CONSUMER_FILE_NAME = "mqs.sdk.consumer.properties";

    private KafkaConsumer<Object, Object> consumer;

    MqsConsumer(String path) {
        Properties props = new Properties();
        try {
            InputStream in = new BufferedInputStream(new FileInputStream(path));
            props.load(in);
        } catch (IOException e) {
            e.printStackTrace();
            return;
        }
        consumer = new KafkaConsumer<Object, Object>(props);
    }

    public MqsConsumer() {
        Properties props = new Properties();
        try {
            props = loadFromClasspath(CONFIG_CONSUMER_FILE_NAME);
        } catch (IOException e) {
            e.printStackTrace();
            return;
        }
        consumer = new KafkaConsumer<Object, Object>(props);
    }

    public void consume(List topics) {
        consumer.subscribe(topics);
    }

    public ConsumerRecords<Object, Object> poll(long timeout) {
        return consumer.poll(timeout);
    }

    public void close() {
        consumer.close();
    }

    /**
     * get classloader from thread context if no classloader found in thread
     * context return the classloader which has loaded this class
     *
     * @return classloader
     */
    public static ClassLoader getCurrentClassLoader() {
        ClassLoader classLoader = Thread.currentThread()
                .getContextClassLoader();
        if (classLoader == null) {
            classLoader = MqsConsumer.class.getClassLoader();
        }
        return classLoader;
    }

    /**
     * 从classpath 加载配置信息
     *
     * @param configFileName 配置文件名称
     * @return 配置信息
     * @throws IOException
     */
    public static Properties loadFromClasspath(String configFileName) throws IOException {
        ClassLoader classLoader = getCurrentClassLoader();
        Properties config = new Properties();

        List<URL> properties = new ArrayList<URL>();
        Enumeration<URL> propertyResources = classLoader
                .getResources(configFileName);
        while (propertyResources.hasMoreElements()) {
            properties.add(propertyResources.nextElement());
        }

        for (URL url : properties) {
            InputStream is = null;
            try {
                is = url.openStream();
                config.load(is);
            } finally {
                if (is != null) {
                    is.close();
                    is = null;
                }
            }
        }

        return config;
    }
}

3.依赖

1.注解依赖

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

2.KafkaConsumer依赖

        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>1.1.0</version>
        </dependency>

可视化大屏项目经常用到消息转换，实时状态等 记录一下吧

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