Matching a world name string to a world?

Heyo, I'm doing a /spawn command, one that teleports you to the spawn point regardless of which world you are in. Now, I have the code for that already, but I can't have it change worlds without setting the world name equal to a world. I'm assuming there's a simple way to do this, and I feel stupid for asking, but is this possible? Here is the code I am talking about:

Code:

spawn = new Location(world, spawnX, spawnX, spawnX, spawnYaw, spawnPitch);

The "world" variable is stored as a string in a .txt file, and once it is called from the text file, it needs to be converted to a world object to match the requirements for the Location object. I'm not quite sure how to do this, however.

 

try along the lines of getServer().getWorld(world) whereas the world variable is a string (no guarantee of this working)

 

Pass a server to the method making the string, or construct the class with that method with a server.
Then use server.getWorld(world);

 

You can also do this without a server object by just doing Bukkit.getWorld(worldName).