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//地址栏不变,只能访问项目内的
//String forward = "/Jsp/abc.jsp";
//RequestDispatcher rd = req.getRequestDispatcher("/Jsp/abc.jsp");
//rd.forward(req, resp);
resp.sendRedirect(req.getContextPath()+"/Jsp/abc.jsp");//地址栏变 可以访问项目外的
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原文地址:http://www.cnblogs.com/wzz1020/p/4681844.html