（十二）会话跟踪技术之servlet通信（forward和include）

一、servlet通信方法

二、具体应用

• scopeServlet.java

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out=response.getWriter();
		out.print("第yi个页面");
		RequestDispatcher dis=this.getServletContext().getRequestDispatcher("/servlet/getscope");
		dis.include(request,response);
		out.close();
	}

•    getScopeServlet.java

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {	
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out=response.getWriter();
		out.print("第er个页面");	}

 

　　　　ps:无论是RequestDispatcher dis=this.getServletContext().getRequestDispatcher("/servlet/getscope");

dis.include(request,response);还是request.getRequestDispatcher("getscope").forward(request,response); 都要添加forwa或者include方法，否则就不能跳转

ps: 特别注意上文中的out.close();的位置，如果它跟在out.print("第yi个页面");的后面，则结果

因为out流已经关闭了，即使跳转到getScopeServlet.java界面也无法输出。