scalaでhttp POST をする場合の最低限のサンプル

gistfile1.sbt

import java.io.{BufferedReader,InputStreamReader,PrintStream}
import java.net.URL
import scala.collection.mutable

// エラー処理とか全くしてないよ!

def post( url:String,header:Map[String,String] = Map() ,param:Map[String,String] = Map() ):List[String] = {

  val uc = new URL(url).openConnection
  uc.setDoOutput(true)

  header.foreach{case (key,value) =>
    uc.setRequestProperty( key , value )
  }

  val postStr = param.map{case (key,value) => key + "=" + value }.mkString("&")
  
  val ps = new PrintStream(uc.getOutputStream)
  ps.print(postStr)
  ps.close()

  val is = uc.getInputStream
  val reader = new BufferedReader(new InputStreamReader(is))
  
  var buffer = new mutable.ListBuffer[String]()
  var s:String = null
  while ({s = reader.readLine;s} != null) {
    buffer += s
  }

  reader.close
  buffer.toList
}

Seq[Byte]で取得.scala

import java.io._
import java.net.URL
import scala.collection.mutable

def post( url:String,header:Map[String,String] = Map() ,param:Map[String,String] = Map() ):Seq[Byte] = {

  val uc = new URL(url).openConnection
  uc.setDoOutput(true)

  header.foreach{case (key,value) =>
    uc.setRequestProperty( key , value )
  }

  val postStr = param.map{case (key,value) => key + "=" + value }.mkString("&")
  
  val ps = new PrintStream(uc.getOutputStream)
  ps.print(postStr)
  ps.close()

  val is = uc.getInputStream
  val buf = new BufferedInputStream(is)
  val ite = Iterator.continually(buf.read).takeWhile(-1 !=).map{_.toByte}
  new mutable.WrappedArray.ofByte(ite.toArray)
}