在Scala中，如何从字符分隔的二进制文件中读取字节？

"功能解决方案，帮助java.nio：

import java.nio.file.{Files, Paths}

object Main {

private val delimiter = 'n'.toByte

def main(args: Array[String]): Unit = {

val byteArray = Files.readAllBytes(Paths.get(args(0)))

case class Accumulator(result: List[List[Byte]], current: List[Byte])

val items: List[Array[Byte]] = byteArray.foldLeft(Accumulator(Nil, Nil)) {
  case (Accumulator(result, current), nextByte) =>
    if (nextByte == delimiter)
      Accumulator(current :: result, Nil)
    else
      Accumulator(result, nextByte :: current)
} match {
  case Accumulator(result, current) => (current :: result).reverse.map(_.reverse.toArray)
}
items.foreach(item => println(new String(item)))

}

}
预计这种解决方案的性能会很差。这对你有多重要？你会阅读多少个文件，大小和频率？如果性能很重要，那么你应该使用输入流和可变集合：

import java.io.{BufferedInputStream, FileInputStream}

import scala.collection.mutable.ArrayBuffer

object Main {

def main(args: Array[String]): Unit = {

val items = ArrayBuffer.empty[Array[Byte]]
val item = ArrayBuffer.empty[Byte]
val bis = new BufferedInputStream(new FileInputStream(args(0)))
var nextByte: Int = -1
while ( { nextByte = bis.read(); nextByte } != -1) {
  if (nextByte == delimiter) {
    items.append(item.toArray)
    item.clear()
  } else {
    item.append(nextByte.toByte)
  }
}
items.append(item.toArray)
items.foreach(item => println(new String(item)))
bis.close()

}

}
private val delimiter = 'n'.toByte"