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                ### **3.1.4 使用 Spring Boot** ***** Spring Boot 可以使事情變得更加簡單。 以下 Spring Boot 應用程序將三個消息發送到一個主題,接收它們,然后停止。 ~~~ @SpringBootApplication public class Application implements CommandLineRunner { public static Logger logger = LoggerFactory.getLogger(Application.class); public static void main(String[] args) { SpringApplication.run(Application.class, args).close(); } @Autowired private KafkaTemplate<String, String> template; private final CountDownLatch latch = new CountDownLatch(3); @Override public void run(String... args) throws Exception { this.template.send("myTopic", "foo1"); this.template.send("myTopic", "foo2"); this.template.send("myTopic", "foo3"); latch.await(60, TimeUnit.SECONDS); logger.info("All received"); } @KafkaListener(topics = "myTopic") public void listen(ConsumerRecord<?, ?> cr) throws Exception { logger.info(cr.toString()); latch.countDown(); } } ~~~ <br > Boot 負責大多數配置。當我們使用本地代理時,我們需要的唯一的配置如下: **例子1. application.properties** ``` spring.kafka.consumer.group-id=foo spring.kafka.consumer.auto-offset-reset=earliest ``` 配置解析: * group-id:此消費者所隸屬的消費組的唯一標識,即消費組的名稱。 * auto-offset-reset:在 Kafka 中每當消費者查找不到所記錄的消費位移時,就會根據消費者客戶端參數 auto.offset.reset 的配置來決定如何從開始進行消費,這個參數的默認值為 “latest”,表示從分區末尾開始消費消息。如果將?auto.offset.reset?參數配置為“earliest”,那么消費者會從起始處,也就是 0 開始消費。 <br >
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