How does a servlet communicate with a JSP page?
The following code snippet shows how a servlet instantiates a bean and initializes it with FORM data posted by a browser. The bean is then placed into the request, and the call is then forwarded to the JSP page, Bean1.jsp, by means of a request dispatcher for downstream processing. public void doPost (HttpServletRequest request, HttpServletResponse response) { try { govi.FormBean f = new govi.FormBean(); String id = request.getParameter(“id”); f.setName(request.getParameter(“name”)); f.setAddr(request.getParameter(“addr”)); f.setAge(request.getParameter(“age”)); //use the id to compute //additional bean properties like info //maybe perform a db query, etc. // . . . f.setPersonalizationInfo(info); request.setAttribute(“fBean”,f); getServletConfig().getServletContext().getRequestDispatcher (“/jsp/Bean1.jsp”).forward(request, response); } catch (Exception ex) { . . . } } The JSP page Bean1.jsp can then process fBean, after first extracting it from the default request scope via the useBean
