Scala Io stream operations

Lifecycle lifecycle 6. Io6.1. File I/O6.1.1. Read files

Scala is unique to Scala. Io. source, for example:

Import scala. Io ._

Source. fromfile ("cn. Scala", "utf8"). mkstring

 

Read object content row by row:

Source. fromfile(New java. Io. File ("cn. Scala ")). Getlines (). foreach (println)

 

6.1.2. Write files

Directly call Java IO:

Import java. Io. _, java. NiO. channels. _, java. NiO ._

// Write an object

Val F = new fileoutputstream ("o.txt"). getchannel

F write bytebuffer. Wrap ("a little bit long...". getbytes)

F close

 

Or:

VaR out = new java. Io. filewriter ("./out.txt") // filewriter ("./out.txt", true) is the append mode.

Out. Write ("Hello \ n ")

Out close

 

6.1.3. Copy a file

Directly call Java IO:

Val in = new fileinputstream ("in"). getchannel

Val out = new fileoutputstream ("out"). getchannel

In transferto (0, In. Size, out)

 

6.2. Network I/O

import java.net.{URL, URLEncoder} import scala.io.Source.fromURL

fromURL(new URL("http://qh.appspot.com")).mkString

Or specify the encoding:

fromURL(new URL("http://qh.appspot.com"))(io.Codec.UTF8).mkString

Scala Io stream operations