The best method, refined by tapptapp is to light the whole mother****ing forest on fire, then just stroll through the burning logs whenever you want, as all kinds of mobs will have perished and if you got one coming at you, just keep walking, he will burn.
I build minecart tracks in a circle, whilst kiting the creeper. Then, I leave 1 minecart on behind me and run straight out. The creeper gets in. I then take shots with a tnt cannon.
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Works on servers, too