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Re: dom and jsp interacation

  • From: Philippe Poulard <Philippe.Poulard@xxxxxxxxxxxxxxx>
  • To: Seetha Rama Krishna <ram_kurra@xxxxxxxxxxx>
  • Date: Thu, 31 Aug 2006 14:12:04 +0200

jsp dom
Seetha Rama Krishna wrote:
> Hello Techies,
>           I am having one jsp thru which I am getting  tag's of the xml 
> file. I want to get the values of these tags when perticular tag is 
> required.
>        Here is sample xml file
> <Date>
> <Today>
>    <Today_Id>12345</Today_Id>
>    <Today_Name>TODAY</Today_Name>
>    <Today_Data_Type>date</Today_Data_Type>
> </Today>
> <EndOfWeek>
>    <EndOfWeek_Id>6789</EndOfWeek_Id>
>    <EndOfWeek_Name>ENDOFWEEK</EndOfWeek_Name>
>    <EndOfWeek_Data_Type>date</EndOfWeek_Data_Type>
> </EndOfWeek>
> </Date>
>     lets us suppose that from jsp I got "Today" as request. Now I 
> created the instance and parsing the xml file.
> DocumentBuilderFactory factory = DocumentBuilderFactory
>                     .newInstance();
>             DocumentBuilder parser = factory.newDocumentBuilder();
>             Document document = parser.parse(xmlFileName);
>             Element documentElement = document.getDocumentElement();
>             NodeList nl = documentElement
>                     .getElementsByTagName("Today");
>             ArrayList mapp = iteratingEachNodeChildValueList(nl);
>        For the next request is EndOfWeek. Here the question arises
> "does i need to create the instance of parser and  read the file for 
> each request??"

Not at all.

IMHO, you should put in the init() method of a servlet the code that 
parses that document and register the DOM document to an attribute of 
your application :
ServletContext#setAttribute(String name, Object object)
that is readable when processing HTTP requests :
ServletContext#getAttribute(String name)

              (. .)
|      Philippe Poulard       |
        Have the RefleX !

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