Im now gonna show you the steps to making spider spawner. This method of building does not work on Zombie or Skeleton spawners

Also, the reason I am in creative is because I made the model spawner on build (It was a little easier having creative)
Hope it helps!:
Step 1:
Find a Spawner.

Step 2:
Place torhces around spawner.

Step 3:
Dig hole 8-14 blocks down

Step 4:
Make an area to stand in while collecting XP.

Step 5:
Remove the torches.

Step 6:
Make a guard exactly like this between you and the mobs

Step 7:
Add chests and furnaces (Optional)

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Congratulations! You now have a completed Spider XP Farm!
