Kafka指定patition消費

As everyone knows the kafka producer can send message to specific patition：

producer.send(new ProducerRecord<String, String>("topic", patition,"key","value"));

Now learn to receive message from kafka consumer
just simple configuration：

1、config：
配置指定消費0和1兩個partition：
partition=0,1

2、

//get partition conf
String partition = props.getProperty("partition");
//have specific patition:
if (partition != null) {
    List<TopicPartition> topicPartitions = new ArrayList<>();
    String[] partitions = partition.split(",");
    for (int i = 0; i < partitions.length; i++) {
        TopicPartition topicPartition = new TopicPartition(topic, Integer.parseInt(partitions[i]));
        topicPartitions.add(topicPartition);
    }
    consumer.assign(topicPartitions);
//do not specific patition :
} else {
    this.consumer.subscribe(Arrays.asList(topic));
}

指定partition時使用consumer.assign() 即用戶自定義partition分配策略。

未指定時使用consumer.subscribe()即消費模式爲指定topic，由kafka指定partition分配策略。