A.writeObject B.readObject C.XMLEncoder D.XMLDecoder
A.Host B.Accect-Encoding C.Content-Type D.User-Agent
A.調(diào)用了系統(tǒng)命令 B.創(chuàng)建了ProcessBuilder對象 C.調(diào)用了exec函數(shù) D.創(chuàng)建了PrintWriter對象