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【多选题】
在Java EE中，如果req是HttpServletRequest的实例，要通过req获取已经存在的HttpSession对象，如果不存在就创建一个HttpSession对象，下面选项中（）可以实现。A.
req.getSession（）
B.
req.getSession（false）
C.
req.getSession（true）
D.
req.createSession（）
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