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Well, I wouldn't do it. At least use treated 4x4s for the corners. If you are dead set on using p/t 2x4s as line posts, you will either need to a) frame the fence out top and bottom as described in earlier posts (only the bottom 'rail' need be p/t) and accept a somewhat weaker fence especially...

For heaven's sake don't use 2x2s. (Treated 2x2s that are for sale are most likely short ones meant for deck railing, um, 'pickets', whatever you'd call the vertical infill). Too twisty and WAY too weak, also you probably can't get 'em in long enough lengths anyhow. Use p/t 4x4s for all corners...