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

Question

我想把两个Dstreams结合起来：

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

但我得到一个错误，类型不匹配：

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

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

我该怎么做呢？

Answer 1

尝尝这个

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

或者如果您想要特定的格式

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