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Reading an XML file in WEB-INF with Bean

Hi there experts,

i have a short question:
I'm currently writing my own Web Application with Java and this Webapplication has its own configuration xml files. These files are under the WEB-INF folder, so only the Servlet or JSP can access it.
Now i want to write a Java Bean that reads this config-files and provides some getter functions...
The reason, why i want to write a bean is, because this config files should be accessed by many servlets and some JSPs.

How can i access the config files with a java bean?
and what would be the best way to parse the XMLs?


thx for your help and best regards!
manuel
0
mesX
Asked:
mesX
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2 Solutions
 
rrzCommented:
Please read
previous discussion  
We can help you with anyway you want to go with this.
JSTL is the easy way to go.  
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mesXAuthor Commented:
Hi and thx for your comment!
As i understand JSTL is only for JSP pages, isn't it?
... and i can't use it within a Java Bean?

Or is my understanding of a Java Bean wrong?
What i want to do is, that my Servlets and JSPs create an Object from my "ApplicationConfig" class which parses the XML and has some getter functions like "String[] getAllEmployeeNames()". So if i change the XML file one day, i just have to re-write my ApplicationConfig class.

Please correct me if my idea is not a good one, because i'm very new to all this :)

regards
Manuel
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rrzCommented:
To get started, try this code.
The file employees.xml contains  
<?xml version="1.0"?>
<company>
	<employee>
		<firstname>John</firstname>
		<lastname>Smith</lastname>
	</employee>
	<employee>
		<firstname>Jane</firstname>
		<lastname>Doe</lastname>
	</employee>
	<employee>
		<firstname>Jerry</firstname>
		<lastname>Brown</lastname>
	</employee>
</company>

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put that xml file into your web app's classes folder.

Create a JSP containing  
<jsp:useBean id="reader" class="rrz.XMLReader" />
<%=reader.read()%>

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This is just quick and dirty demo code. We should create getter and setter methods for fields in your bean.
Show us an example of your XML and tell us what you want to access, if you want more help.

package rrz;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class XMLReader {
  public String read(){
      StringBuilder sb = new StringBuilder();
      try {
           DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
           DocumentBuilder db = dbf.newDocumentBuilder();
           Document doc = db.parse(getClass().getClassLoader().getResourceAsStream("employees.xml"));
           doc.getDocumentElement().normalize();
           sb.append("Root element " + doc.getDocumentElement().getNodeName() + "<br/>");
           NodeList nodeLst = doc.getElementsByTagName("employee");
           sb.append("Information of all employees" + "<br/>");
           for (int s = 0; s < nodeLst.getLength(); s++) {
              Node fstNode = nodeLst.item(s);
              if (fstNode.getNodeType() == Node.ELEMENT_NODE) {
                 Element fstElmnt = (Element) fstNode;
                 NodeList fstNmElmntLst = fstElmnt.getElementsByTagName("firstname");
                 Element fstNmElmnt = (Element) fstNmElmntLst.item(0);
                 NodeList fstNm = fstNmElmnt.getChildNodes();
                 sb.append("First Name : "  + ((Node) fstNm.item(0)).getNodeValue() + "<br/>");
                 NodeList lstNmElmntLst = fstElmnt.getElementsByTagName("lastname");
                 Element lstNmElmnt = (Element) lstNmElmntLst.item(0);
                 NodeList lstNm = lstNmElmnt.getChildNodes();
                 sb.append("Last Name : " + ((Node) lstNm.item(0)).getNodeValue() + "<br/>");
              }
           }
      } catch (Exception e) {
                             e.printStackTrace();
        }
      return sb.toString();
  }
}

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mesXAuthor Commented:
You're absolutely awesome!!!! THANK YOU VERY MUCH!

I just have a very small question:
What if i put the employee.xml directly under the WEB-INF folder? Or in my case /WEB-INF/configs/employee.xml? How can i access files inside the WEB-INF folder but outside the classes folder?


best regards
Manuel
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rrzCommented:
>How can i access files inside the WEB-INF folder but outside the classes folder?  
There are several ways. One simple way is pass the path from JSP to bean.
<jsp:useBean id="reader" class="rrz.XMLReader" />
<%
  String path = application.getRealPath("/WEB-INF/configs/employees.xml");
  reader.setPath(path);
%>
<%=reader.read()%>

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and in source code  
File file = new File(path);
           DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
           DocumentBuilder db = dbf.newDocumentBuilder();
           Document doc = db.parse(file);

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Better to solution at  previous discussion
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mesXAuthor Commented:
Thank you so much for all your help! You're a truly expert ;)

I hope you can help me in my future questions too (and i will surely have many  ;) )

best regards
Manuel
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