[opencms-dev] How to access own Java Class via JSP in OpenCMS 5 RC2

ambiesense at gmx.de ambiesense at gmx.de
Sat Apr 5 12:52:14 CEST 2003 

Hi,

I send this email the THIRD time, since I think there was a technical
problem (have not received it). Sorry for possible higher traffic... :-?

I tried another approach (see JSP below). Unfortunately cmsObject is null.
Does somebody knows why? The code used should work like the useBean
setProperty appraoch - right?


<html>
  <head>
    <title>Test</title>
  </head>
  <body>
    <h2>
      Test <BR><BR>
    
    <%    
      // initialise Cms Action Element
      com.opencms.flex.jsp.CmsJspActionElement cms = new
      com.opencms.flex.jsp.CmsJspActionElement(pageContext, request,
      response);
    
      // collect the CmsObject required to access the OpenCms VFS
      com.opencms.file.CmsObject cmsObject = cms.getCmsObject();

      mypackage.MyBean myBean = new mypackage.MyBean();
      myBean.setCmsObject(cmsObject);
      myBean.dosomething();
    %>
    
    </h2>
</body>
</html>



Cheers,
Ralf


> Just some quick things on that from my side:
> 
> Get an instance from the CmsObject like this on your JSP page:
> 
> <%
>  
> // initialise Cms Action Element
> com.opencms.flex.jsp.CmsJspActionElement cms = new
> com.opencms.flex.jsp.CmsJspActionElement(pageContext, request,
> response);
>     
> // collect the CmsObject required to access the OpenCms VFS 
> com.opencms.file.CmsObject cmsObject = cms.getCmsObject(); 
> 
> %>
> 
> Now create an instance of your Bean. Your Bean should then have a method
> like "setCmsObject(CmsObject cms)". Use this method to pass the OpenCms
> object to the bean. Do stuff with the CmsObject in your bean.
> 
> I do not recommend storing the CmsObject in the session. Reason is that
> that CmsObject also contains the credentials of the user who has logged
> on to OpenCms (user is Guest if he is not logged on). This also means
> that you will have only accesss to resources that user Guest can access.
> Make sure your permissions are set accordingly. Storing the OpenCms
> object in the context is o.k. as long as it is the page or request
> context. 
> 
> Best Regards,
> Alex.
> 
> Alexander Kandzior
> Alkacon Software - The OpenCms Experts
> http://www.alkacon.com
> 
> > -----Original Message-----
> > From: owner-opencms-dev at www.opencms.org 
> > [mailto:owner-opencms-dev at www.opencms.org] On Behalf Of Marcus Redeker
> > Sent: Friday, April 04, 2003 12:30 AM
> > To: opencms-dev at www.opencms.org
> > Subject: RE: [opencms-dev] How to access own Java Class via 
> > JSP in OpenCMS 5 RC2
> > 
> > 
> > You can get access to the CmsObject from your JSP request 
> > object. Look into the nav-demo.jsp Once you have the 
> > CmsObject you can give it into your bean class using a normal 
> > setter. It should also be possible to store the CmsObject 
> > within the Web-Session or even the Context. But I am not sure 
> > about that. Maybe Alexander knows about that.
> > 
> > Cheers,
> > --Marcus
> > 
> > 
> > 
> > > -----Original Message-----
> > > From: opencms-dev-owner at www.opencms.org
> > > [mailto:opencms-dev-owner at www.opencms.org] On Behalf Of 
> > > ambiesense at gmx.de
> > > Sent: Thursday, April 03, 2003 8:08 PM
> > > To: opencms-dev at www.opencms.org
> > > Subject: RE: [opencms-dev] How to access own Java Class via 
> > > JSP in OpenCMS 5 RC2
> > > 
> > > 
> > > Hello,
> > > 
> > > thanks for your quick answer :) This sounds good. I have had
> > > a look to the usebean Tag. However this bean need to get 
> > > access to the OpenCMS instance. This seems to be a problem. I 
> > > have used that code before triggered by a content template. 
> > > Every time a website, made from this OpenCMS content 
> > > template, was accessed. My class overwrites that method:
> > > 
> > > public byte[] getContent(CmsObject cms, String templateFile,
> > > String elementName, 
> > >                              Hashtable parameters, String 
> > > templateSelector) throws CmsException {
> > > 
> > > so I got access to CmsObject. With this CmsObject I could
> > > access i.e. Files in the VFS or users in OpenCMS. 
> > > 
> > > How can I do this with the JSP approach?
> > > 
> > > Any help would be highly appreciated!
> > > 
> > > Cheers,
> > > Ralf
> > > 
> > > > Hi,
> > > > 
> > > > this is no problem. You just have to make sure that the
> > > OpenCMS webapp
> > > > is seeing your class. Either put it into the  opencms.jar or under
> > > > WEB-INF/classes. If you just want to use the class as a 
> > > bean you can
> > > > use the "useBean" - Tag. For that you don't need to write your own
> > > > tags.
> > > > 
> > > > --Marcus
> > > > 
> > > > > -----Original Message-----
> > > > > From: opencms-dev-owner at www.opencms.org 
> > > > > [mailto:opencms-dev-owner at www.opencms.org] On Behalf Of 
> > > > > ambiesense at gmx.de
> > > > > Sent: Thursday, April 03, 2003 6:23 PM
> > > > > To: opencms-dev at www.opencms.org
> > > > > Subject: [opencms-dev] How to access own Java Class via JSP
> > > > > in OpenCMS 5 RC2
> > > > > 
> > > > > 
> > > > > Hi,
> > > > > 
> > > > > I followed the advice of Tim Howland and want to use 
> > JSP and JSTL 
> > > > > for dynamic page generation. I am planning to develop an Hello 
> > > > > World example:
> > > > > 
> > > > > I want to have a JSP page with a very basic form (textfield and 
> > > > > submit button).  The user enters his name  in the 
> > textfield (i.e. 
> > > > > Bob) and press the submit button. The word get somehow 
> > transported 
> > > > > to another JSP page which calles a method in my own Java class 
> > > > > with the word as parameter. The Java class simply returns the 
> > > > > input (Echo method). This result should be displayed in 
> > this JSP 
> > > > > so it finally produces the output: "Hello World Bob".
> > > > > 
> > > > > Is this generally possible? Will I need to develop my 
> > own TLD file 
> > > > > declaring the tags I want to be able to use? Does somebody has 
> > > > > already developed some JSP which access a own
> > > > > (non-OpenCMS) Java class (i.e. a Java Bean) ?
> > > > > 
> > > > > Thanks in advance,
> > > > > Ralf
> > > > > 
> > > > > --
> > > > > +++ GMX - Mail, Messaging & more  http://www.gmx.net +++
> > > > > Bitte lächeln! Fotogalerie online mit GMX ohne eigene Homepage!
> > > > > 
> > > > > 
> > > > 
> > > > 
> > > 
> > > --
> > > +++ GMX - Mail, Messaging & more  http://www.gmx.net +++
> > > Bitte lächeln! Fotogalerie online mit GMX ohne eigene Homepage!
> > > 
> > > 
> > 
> > 
> > 
> > 
> 

-- 
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