import scala.io.Source

val source = Source.fromFile("myfile.txt", "UTF-8")

val lineIterator = source.getLines

val lines1 =lineIterator.toArray

val lines2 = lineIterator.toBuffer

//将文件内容读成字符串

val lines = source.mkString

source.close 

val iter = source.buffered  

while(iter.hasNext){

  if(iter.next == '王'){

    println("wang")

  }else{

    println("-")

  }

}  

val iter 2= source.mkString.split("\\s+")  

val num = for(w <- iter2) yield w.toDouble  

for(i <- num) println(i) 

val source1 = Source.fromURL("http://baidu.com")//URL读取

val source2 = Source.fromString("hello")//读取给定的字符串-多用于调试

import scala.io.StdIn

val ms=StdIn.readLine()  

import java.io.{File, FileInputStream}

val file = new File(" ")

val in = new FileInputStream(file)

val bytes = new Array[Byte](file.length.toInt)

in.read(bytes)

in.close() 

val out = new PrintWriter("numbers.txt")

for (i <- 1 to 100) {

out.println(i)

out.print(f"$quantity%6d $price%10.2f")

}

out.close() 

import java.nio.file._

val dirname = "/home/cay/scala-impatient/code"

val entries = Files.walk(Paths.get(dirname)) // or Files.list

try {

entries.forEach(p => println(p))

} finally {

entries.close()

} 

@SerialVersionUID(42L) class Person extends Serializable{}

class Person extends Serializable {

private val friends = new ArrayBuffer[Person] // OK—ArrayBuffer is serializable

}

val fred = new Person(...)

import java.io._

val out = new ObjectOutputStream(new FileOutputStream("/tmp/test.obj"))

out.writeObject(fred)

out.close()

val in = new ObjectInputStream(new FileInputStream("/tmp/test.obj"))

val savedFred = in.readObject().asInstanceOf[Person]

import scala.sys.process._

"ls -al ..".!

("ls -al /" #| "grep u").!

#输出重定向到文件

("ls -al /" #> new File("filelist.txt")).!

#追加到末尾

("ls -al /etc" #>> new File("filelist.txt")).!

#把某个文件的内容作为输入

("grep u" #< new File("filelist.txt")).!

#从URL重定向输入

("grep Scala" #< new URL("http://horstmann.com/index.html")).!