private val in = new BufferedReader(new InputStreamReader(con.getInputStream()))
  private val out = new PrintWriter(con.getOutputStream(),true)
  try {
    while (true) {
      if (in.readLine() == null)
        throw new IOException("connection reset by peer")
    }
  } catch {
    case e: Exception =>
  } finally {

    // Is this necessary?
    in.close()
    out.close()

    // Close socket
    con.shutdownInput()
    con.shutdownOutput()
    con.close()
  }

如果从套接字的输入或输出流创建任何IO流或读/写器,是否需要在套接字关闭之前或之后关闭它们？