public class BaseServlet extends HttpServlet{ @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //设置编码表 req.setCharacterEncoding("UTF-8"); resp.setContentType("text/html;charset=UTF-8"); // 接收参数: String methodName = req.getParameter("method"); //如果method传递的参数为null或者为空字符串,作出提示 if(methodName == null || "".equals(methodName)){ resp.getWriter().println("method参数为null!!!"); return; } // 获得子类的Class对象: /** * this.class代表加载继承了这个BaseServlet的class对象 * */ Class clazz = this.getClass(); // 获得子类中的方法了: try { Method method = clazz.getMethod(methodName, HttpServletRequest.class,HttpServletResponse.class); // 使方法执行,并获取子类return的字符串 String path = (String)method.invoke(this, req,resp); //转发 if(path != null){ req.getRequestDispatcher(path).forward(req, resp); } } catch (Exception e) { e.printStackTrace(); } } }