直接上代码

StreamingExamples.setStreamingLogLevels()
val Array(brokers, topics) = args // Create context with 2 second batch interval
// 创建conf,spark streaming至少要启动两个线程,一个负责接受数据,一个负责处理数据
val conf = new SparkConf().setMaster("local[4]").setAppName("NetworkWordCount") // 创建StreamingContext,每隔2秒产生一个批次
val ssc = new StreamingContext(conf, Seconds(2)); val topicsSet = topics.split(",").toSet // 配置Kafka参数
val kafkaParams = Map[String, String]("metadata.broker.list" -> brokers) // 用直连方式读取Kafka数据,在Kafka中读取偏移量
val messages = KafkaUtils.createDirectStream[String, String](
ssc,
LocationStrategies.PreferConsistent,// 位置策略(如果Kafka和spark程序在同一台机器,会从最优位置读取数据【当前位置】)
ConsumerStrategies.Subscribe[String, String](topicsSet, kafkaParams))// 订阅策略(可以指定用正则的方式读取topic【topic-*】) //====================在下面写业务逻辑============================
val lines = messages.map(_.value())
val words = lines.flatMap(_.split(" "))
val wordCounts = words.map(x=>(x, 1L)).reduceByKey(_+_)
wordCounts.print()
//====================在上面写业务逻辑============================ ssc.start()
ssc.awaitTermination()

  打包报错

Error:(44, 49) overloaded method value createDirectStream with alternatives:
(jssc: org.apache.spark.streaming.api.java.JavaStreamingContext,locationStrategy: org.apache.spark.streaming.kafka010.LocationStrategy,consumerStrategy: org.apache.spark.streaming.kafka010.ConsumerStrategy[String,String],perPartitionConfig: org.apache.spark.streaming.kafka010.PerPartitionConfig)org.apache.spark.streaming.api.java.JavaInputDStream[org.apache.kafka.clients.consumer.ConsumerRecord[String,String]] <and>
(jssc: org.apache.spark.streaming.api.java.JavaStreamingContext,locationStrategy: org.apache.spark.streaming.kafka010.LocationStrategy,consumerStrategy: org.apache.spark.streaming.kafka010.ConsumerStrategy[String,String])org.apache.spark.streaming.api.java.JavaInputDStream[org.apache.kafka.clients.consumer.ConsumerRecord[String,String]] <and>
(ssc: org.apache.spark.streaming.StreamingContext,locationStrategy: org.apache.spark.streaming.kafka010.LocationStrategy,consumerStrategy: org.apache.spark.streaming.kafka010.ConsumerStrategy[String,String],perPartitionConfig: org.apache.spark.streaming.kafka010.PerPartitionConfig)org.apache.spark.streaming.dstream.InputDStream[org.apache.kafka.clients.consumer.ConsumerRecord[String,String]] <and>
(ssc: org.apache.spark.streaming.StreamingContext,locationStrategy: org.apache.spark.streaming.kafka010.LocationStrategy,consumerStrategy: org.apache.spark.streaming.kafka010.ConsumerStrategy[String,String])org.apache.spark.streaming.dstream.InputDStream[org.apache.kafka.clients.consumer.ConsumerRecord[String,String]]
cannot be applied to (org.apache.spark.streaming.StreamingContext, org.apache.spark.streaming.kafka010.LocationStrategy, org.apache.spark.streaming.kafka010.ConsumerStrategy[Nothing,Nothing])
val messages = KafkaUtils.createDirectStream[String, String](

这是一个很长的信息,说主题需要设置[字符串],而不是设置[字符]。

我能看到解决这个问题的最佳方法是:

val topicsSet = topics.toString.split(",").toSet

但是,如果你真的只有一个主题,那么只需按照上面的Set(topics)将字符串拆分成一组单个字符。

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