ignoredecodetest.scala utf-8でdecodeできないファイルをscalaで扱う

ignoredecodetest.scala

import java.io.{InputStreamReader, FileInputStream, BufferedReader}
import java.nio.charset.{Charset, CharsetDecoder, CodingErrorAction}

/*
通常 Source.fromFile("sample.txt")では
java.nio.charset.MalformedInputException: Input length = 1
エラーが出る場合使う.
*/

object IgnoreDecodeTest{
  val name = "sample.txt" // utf-8でdecodeできないcharactorを含むファイル
  def main(args: Array[String]){
    val file = new FileInputStream(name)
    val decoder = Charset.forName("UTF-8").newDecoder()
    decoder.onMalformedInput(CodingErrorAction.IGNORE)
    val reader = new BufferedReader(new InputStreamReader(file, decoder))
    var line = ""
    try{
      while ({line = reader.readLine(); line != null}) {
	println(line);
      }
    } finally{
      reader.close()
    }
  }
}