Chris Powell wrote:
>
> Hi,
> Can anyone assist me, PLEASE.
> I have created a JSP and included a call to a simple bean which all
> works fine.
> I need to know how within my bean I can call another class/bean?
>
> I am trying to write a validate bean that calls a 'wrapped database
> procedure' class in Oracle.
>
> Any helpful comments would be appreciated.
>
> Thanks
>
> Chris
>
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You can call any other class from within a Bean in the same way as you
do in any java code eg
MyNewWierdBean bean = new my.package.MyNewWierdBean();
If you mean who do I get a reference to an existing object from within
the JSP context then you can use the javax.servlet.jsp.PageContext to
find such a reference.
Or use a remote object technology like RMI or CORBRA (using JNDI
lookup).
Or you can pass objects into the JSP session bean's sesion , say for
instance my JSP ("/Docs/hellouser.jsp") made use of the bean below
<jsp:useBean id="mybean" scope="session"
class="kcom.kms.beans.NameHandler" type="kcom.kms.beans.NameHandler" >
</jsp:useBean>
It is a session bean so i could create it from outside the JSP (say in a
servlet) and pass it into the JSP's session, The JSP checks to see if
such a bean is already in existance before it creates one. so I could
pass one in as follows
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import kcom.kms.beans.NameHandler;
public class TestServlet2 extends HttpServlet {
NameHandler mybean= new NameHandler();
public void init(ServletConfig config) throws ServletException {
super.init(config);
mybean.setUsername("Yes");
}
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
HttpSession session = req.getSession(true);
session.putValue("mybean", mybean);
String whereTo=HttpUtils.getRequestURL(req).toString();
session.putValue("where.to",whereTo);
String test = new String("wayhay");
session.putValue("test.string", test);
RequestDispatcher rd= \
getServletContext().getRequestDispatcher(res.encodeURL("/Docs/hellouser.jsp"));
try {
rd.forward(req,res);
}
catch (ServletException se) {
res.setContentType("text/plain");
PrintWriter out= res.getWriter();
out.println("ERROR in Forward\n\n"+se+"\n");
out.close();
}
}
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
doGet(req,res);
}
}
Hope it helped
Karl
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