Do most introductory QFT books contain QED treatment?
I do know that most books contain introductory treatment on QCD, but not usre on QED.
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Yes, it usually is. I would not say that introductory courses teach you much about QCD, rather they start with scalar fields and QED.
As the bosonic part of QED is based on a simpler gauge theory than the Yang-Mills theory for QCD, you actually want to learn QED first. (There is only the one-dimensional Lie-Group U(1) <=> one photon, SU(3) <=> 8 gluons)