如何从控制器发送可接受格式的数据到Highstock？

I am new to Highstock, am not able to plot the graph. I am sending an AJAX request to get the graph data.I am returning List of X-Axis Data, and List of Y-Axis Data, I also used Map but the values are coming like {1420051860000=101}, which is not acceptable format in Highstock.I am new to Highstock, am not able to plot the