（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。