一：RequestDispatcher.forward()

       是在服务器端起作用，当使用forward()时，Servlet engine 传递HTTP请求从当前的Servlet  or jsp  到另外一个Servlet JSP 或普通HTML文件

       可以进行参数传递 如：

RequestDispatcher rd = context.getRequestDispatcher("/jsp/forward.jsp?name=zhangsan"); 

RequestDispatcher rd = context.getRequestDispatcher("/F?name=jingjing"); 

             重定向后浏览器地址栏URL不变

<p>     例：在servlet中进行重定向</p><p>          </p><pre class="java" name="code">public void doPost(HttpServletRequest request, HttpServletResponse response) 

            throws ServletException, IOException { 

        response.setContentType("text/html"); 

        ServletContext context = getServletContext(); 

        //forward()到jsp  

        RequestDispatcher rd = context.getRequestDispatcher("/jsp/forward.jsp?name=zhangsan"); 

        //forward()到令一个servlet F为servlet的url-pattern  servlet也可进行参数传递 

        //RequestDispatcher rd = context.getRequestDispatcher("/F?name=jingjing");