How can I get string in Minecraft? Spiders are so few and far between (for me anyway), and I don't like to venture outside at night for fear of mobs, and even in the daytime there are creepers to watch out for.
Is there some sort of trap I can use to trap spiders?
Since spiders can climb walls, but not with a lip, I thought maybe a pen with a wall like this would work:
   
Would this work to trap spiders? I need some way to get spiders so I can get string.