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//XML文件<servlet-mapping><servlet-name>RegServlet</servlet-name><url-pattern>/servlet/RegServlet</url-pattern></servlet-mapping>

request.getRequestDispatcher("../userinfo.jsp").forward(request,response);
@WebServlet("/RegServlet") //新特性 访问地址直接配置好了
request.getRequestDispatcher("userinfo.jsp").forward(request, response);
request.getRequestDispatcher("/userinfo.jsp").forward(request, response);// ‘/’表示根目录
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原文地址:http://www.cnblogs.com/Val1ant/p/5338857.html