scala读取文件:
import scala.io.Source
val source = Source.fromFile("myfile.txt","UTF-8")//第一个参数可以是字符串或者是java.io.File;第二个参数可选
val lineIterator = source.getLines
for (l <- lineIterator) print l
可以用toArray或toBuffer方法将行放到数组或数组缓冲中:
val lines = source.getLines.toArray
把整个文件读成一个字符串:
val contents = source.mkString
val tokens = contents.split("\\s+")
val numbers = for (w <= tokens) yield w.toDoule
val numbers = tokens.map(_.toDoule)
从其它源读取:
val source1 = Source.fromURL("http://","UTF-8")
val source2 = Source.fromString("")
val source3 = Source.stdin //从标准输入读取
使用java的类库读写:
import java.io.File
val file = new File(filename)
val in = new FileInputStream(file)
val bytes = new Array[Byte](file.length.toInt)//读取二进制文件
in.read(bytes)
in.close()
val out = new PrintWriter("numbers.txt")//写文本文件
for (i <- 1 to 100) out.println(i)
out.close()
//访问目录
def subdirs(dir:File):Iterator[File] = {
val children = dir.listFiles.filter(_.isDirectory)
children.toIterator ++ children.toIterator.flatMap(subdirs _)
}
for (d <- subdirs(dir)) 处理d