scala - 如何关闭枚举文件？

Question

比如说，在我的行动中:

val linesEnu = {
    val is = new java.io.FileInputStream(path)
    val isr = new java.io.InputStreamReader(is, "UTF-8")
    val br = new java.io.BufferedReader(isr)
    import scala.collection.JavaConversions._
    val rows: scala.collection.Iterator[String] = br.lines.iterator
    Enumerator.enumerate(rows)
}

Ok.feed(linesEnu).as(HTML)

如何关闭阅读器/流？

Answer 1

有一个 onDoneEnumerating 回调函数，其功能类似于 finally(无论 Enumerator 是否失败，都会被调用)。您可以在那里关闭流。

val linesEnu = {
    val is = new java.io.FileInputStream(path)
    val isr = new java.io.InputStreamReader(is, "UTF-8")
    val br = new java.io.BufferedReader(isr)
    import scala.collection.JavaConversions._
    val rows: scala.collection.Iterator[String] = br.lines.iterator
    Enumerator.enumerate(rows).onDoneEnumerating {
        is.close()
        // ... Anything else you want to execute when the Enumerator finishes.
    }
}