get the yaw for whatever direction you want the player to look then use "player.setYaw(yaw)" I don't know the yaw values off the top of my head so you'll need to find those yourself, I recommend Google.
elementalgodz11 You could even just test the yaws by setting them in your program and using the toString() method.
There is a Location constructor with two floats, "yaw" and "pitch". Just add them to your current code.