项目集成ons-client和kafka-clients

集成ons-client和kafka-clients的过程如下：

1. 在项目的pom.xml文件中添加ons-client和kafka-clients的依赖：

<dependencies>
    <dependency>
        <groupId>com.aliyun.openservices</groupId>
        <artifactId>ons-client</artifactId>
        <version>1.0.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka-clients</artifactId>
        <version>2.2.1</version>
    </dependency>
</dependencies>

2. 在项目中编写ons-client和kafka-clients的配置文件，例如在resources目录下新建ons.properties和kafka.properties文件：

ons.properties文件：

accessKey=<your_access_key>
secretKey=<your_secret_key>
onsAddr=<your_ons_address>

kafka.properties文件：

bootstrap.servers=<your_kafka_bootstrap_servers>
acks=all
retries=0
batch.size=16384
linger.ms=1
buffer.memory=33554432
key.serializer=org.apache.kafka.common.serialization.StringSerializer
value.serializer=org.apache.kafka.common.serialization.StringSerializer
key.deserializer=org.apache.kafka.common.serialization.StringDeserializer
value.deserializer=org.apache.kafka.common.serialization.StringDeserializer

3. 在代码中使用ons-client和kafka-clients发送和接收消息，例如：

使用ons-client发送消息：

Properties properties = new Properties();
properties.load(this.getClass().getClassLoader().getResourceAsStream("ons.properties"));
Producer producer = ONSFactory.createProducer(properties);
Message message = new Message("topic_test", "tag_test", "Hello, ONS!".getBytes());
SendResult sendResult = producer.send(message);

使用kafka-clients发送消息：

Properties properties = new Properties();
properties.load(this.getClass().getClassLoader().getResourceAsStream("kafka.properties"));
Producer<String, String> producer = new KafkaProducer<>(properties);
ProducerRecord<String, String> record = new ProducerRecord<>("topic_test", "Hello, Kafka!");
producer.send(record);

使用ons-client接收消息：

Properties properties = new Properties();
properties.load(this.getClass().getClassLoader().getResourceAsStream("ons.properties"));
Consumer consumer = ONSFactory.createConsumer(properties);
consumer.subscribe("topic_test", "*", new MessageListener() {
    @Override
    public Action consume(Message message, ConsumeContext context) {
        System.out.println("Received message: " + new String(message.getBody()));
        return Action.CommitMessage;
    }
});
consumer.start();

使用kafka-clients接收消息：

Properties properties = new Properties();
properties.load(this.getClass().getClassLoader().getResourceAsStream("kafka.properties"));
Consumer<String, String> consumer = new KafkaConsumer<>(properties);
consumer.subscribe(Collections.singletonList("topic_test"));
while (true) {
    ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
    for (ConsumerRecord<String, String> record : records) {
        System.out.println("Received message: " + record.value());
    }
}