Update: A kind soul mentioned that I should be using the requestDispatcher
and not sendRedirect. This solved the problem.
>From: Java Guy <[EMAIL PROTECTED]>
>Reply-To: Java Guy <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Help, Model 2 implementation
>Date: Tue, 13 Jul 1999 11:45:36 PDT
>
>Please help!
>
>I'm using jswdk-1.0-ea on Linux 2.2 with blackdown.org's JDK 1.2,
>pre-release-v1. I'm trying to implement the model 2 approach. It
>sounds simple, I even had it working under .92 but no matter what I
>do, I can't get it to work under 1.0ea.
>
>I've read many posts from the mailing list archives including the
>excellent post from Craig McClanahan
>http://archives.java.sun.com/cgi-bin/wa?A2=ind9907&L=jsp-interest&F=&S=&P=7211
>and the JSP FAQ. Please take a look and let me know where I'm making
>the (obvious?) mistake. Any hints will be greatly appreciated.
>
>foo is the servlet. foo instantiates the bean blah.bar, sets a data
>member of the bean (userFullName) to a string, saves the bean in the
>session and performs a sendRedirect to the jsp (foo.jsp). The jsp
>simply calls a method in the bean to display the value that was saved
>by the servlet. One thing that worries me is that a NEW instance of
>the bean is created by the jsp (I know this because I have put a debug
>message in the constructor).
>
>The messages returned by the servlet runner are at the bottom.
>
>
>=============================================================================
>FILE: /usr/local/java/jswdk-1.0-ea/examples/jsp/blah/foo.jsp
>-----------------------------------------------------------------------------
><%@ page language="java" import="blah.*" %>
>
><jsp:useBean id="the_state" scope="session" class="blah.bar" />
>
><%= the_state.getUserFullName() %>
>
>
>
>=============================================================================
>FILE: /usr/local/java/jswdk-1.0-ea/examples/WEB-INF/servlets/foo.java:
>-----------------------------------------------------------------------------
>import java.io.*;
>import java.util.*;
>import javax.servlet.*;
>import javax.servlet.http.*;
>import blah.*;
>
>public class foo extends HttpServlet
>{
> private String JSPSCRIPTDIRECTORY = "/examples/jsp/blah"; // KLUDGE
>
> public void init(ServletConfig config) throws ServletException
> {
> super.init(config);
> }
>
> public void doPost (HttpServletRequest req, HttpServletResponse res)
> throws ServletException, IOException
> {
> // Get the session object. Create one if it doesn't exist
> HttpSession session = req.getSession(true);
>
> bar state = new bar();
> state.setUserFullName("THIS IS A STRING");
> session.putValue("the_state", state);
> res.sendRedirect(JSPSCRIPTDIRECTORY + "/foo.jsp");
> }
>
> public void doGet (HttpServletRequest req, HttpServletResponse res)
> throws ServletException, IOException
> {
> doPost(req, res);
> }
>}
>
>=============================================================================
>FILE: /usr/local/java/jswdk-1.0-ea/examples/WEB-INF/jsp/beans/blah/bar.java
>-----------------------------------------------------------------------------
>package blah;
>
>import java.io.*;
>
>public class bar implements Serializable
>{
> public String userFullName;
> public bar ()
> {
> System.out.println("*** IN bar::bar ***");
> }
>
> public String getUserFullName()
> {
> return ("ABCD" + userFullName);
> }
>
> public void setUserFullName(String uname)
> {
> userFullName = uname;
> }
>}
>
>
>=============================================================================
>Output:
>
>startserver print this on the console:
>
>Loaded configuration from file:/usr/local/java/jswdk-1.0-ea/default.cfg
>endpoint created: :8080
>com.sun.web.core.InvokerServlet: init
>foo: init
>*** IN bar::bar ***
>com.sun.jsp.runtime.JspServlet: init
>Scratch dir for JSP-generated servlets is: work/%3A8080%2Fexamples
>IMPORTANT: Do not modify the generated servlets
>JspEngine --> /usr/local/java/jswdk-1.0-ea/examples/jsp/blah/foo.jsp
>*** IN bar::bar ***
>
>
>NOTE that the bar object is being created twice: Once in the servlet
>and the second time by the jsp. I want the jsp to use the object that
>was created by the servlet.
>
>-----------------------------------------------------------------------------
>In lynx, I see:
>
>ABCDnull
>
>(please note the 'null')
>
>Thank you so very much for any help...
>
>
>_______________________________________________________________
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