URLPrinter.scala

import java.io.{UnsupportedEncodingException, InputStreamReader, IOException}
import java.net.{ProtocolException, MalformedURLException, HttpURLConnection, URL}
import util.control.Exception._

object URLPrinter extends App {
  val defaultEncoding = "CP1251"
  val targetURL = "http://google.com"
  var readerOpt = Option.empty[InputStreamReader]

  val catchingErrors = Seq(
    classOf[MalformedURLException],
    classOf[IOException],
    classOf[ProtocolException],
    classOf[UnsupportedEncodingException]
  )

  catching(catchingErrors: _*).andFinally {
    // finally close the input reader
    allCatch.opt {
      readerOpt.map(_.close())
    }
  } .either {
    val u = new URL(targetURL)
    val con = u.openConnection().asInstanceOf[HttpURLConnection]
    con.setRequestMethod("GET")
    con.connect()
    val enc = Option(con.getContentEncoding).getOrElse(defaultEncoding)
    readerOpt = Some(new InputStreamReader(con.getInputStream, enc))
    readerOpt.map { reader =>
      val buf = Array.ofDim[Char](4048)
      reader.read(buf)
      print(buf.mkString(""))
    }
  } .left.map { e =>
    e.printStackTrace()
  }
}