January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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34
｜
第
3
章
kafkaProps.put("bootstrap.servers", "broker1:9092,broker2:9092");
kafkaProps.put("key.serializer",
"org.apache.kafka.common.serialization.StringSerializer");
➋
kafkaProps.put("value.serializer",
"org.apache.kafka.common.serialization.StringSerializer");
producer = new KafkaProducer<String, String>(kafkaProps);
➌
➊
新建一个 Properties 对象。
➋
因为我们打算把键和值定义成字符串类型，所以使用内置的
StringSerializer
。
➌
在这里我们创建了一个新的生产者对象，并为键和值设置了恰当的类型，然后把
Properties
对象传给它。
这个接口很简单，通过配置生产者的不同属性就可以很大程度地控制它的行为。
Kafka
的
文档涵盖了所有的配置参数，我们将在这一章的后面部分介绍其中几个比较重要的参数。
实例化生产者对象后，接下来就可以开始发送消息了。发送消息主要有以下
3
种方式。
发送并忘记（
fire-and-forget
）
我们把消息发送给服务器，但并不关心它是否正常到达。大多数情况下，消息会正常到
达，因为
Kafka
是高可用的，而且生产者会自动尝试重发。不过，使用这种方式有时候 ...
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