Most corporations do not hire attorneys directly from law school, but rather wait until associates have gained a few years of legal experience.
Some corporations with large legal departments may hire new law school graduates, but these are the exceptions. Most (but not all) corporations do not hire students for summer positions. LL.M. students with significant direct experience or with transferable work experience are the most frequently recruited students for these positions.
The Association of Corporate Counsel (ACC) Web site may be a helpful resource for students interested in pursuing corporate positons.