Question

我试图联合两个Dstreams：

val statuses = tweets.map(status => status.getText())
    val users = tweets.map(status => status.getUser())
    val Dates = tweets.map(status => status.getCreatedAt())
    (statuses. union(Dates)).print

但我收到的错误是类型不匹配：

Found: org.apache.spark.streaming.dstream.DStream[java.util.Date]

Required: org.apache.spark.streaming.dstream.DStream[String]

我该如何进行转换？

Answer 1

试试这个

val Dates = tweets.map(status => status.getCreatedAt.toString)

或者如果你想要特定的格式

val format = new SimpleDateFormat("yyyy-MM-dd")
val Dates = tweets.map(status => format.format(status.getCreatedAt))

将DStream [java.util.Date]转换为DStream [String]

1 个答案: