How does a servlet communicate with a JSP page?

Govind Seshadri

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 action.

<jsp:useBean id="fBean" class="govi.FormBean" scope="request"/>
<jsp:getProperty name="fBean" property="name" />
<jsp:getProperty name="fBean" property="addr" />
<jsp:getProperty name="fBean" property="age" />
<jsp:getProperty name="fBean" property="personalizationInfo" />
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