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writing values into a XML file from a JSP

Posted on 2003-11-18
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Last Modified: 2008-01-16
Hi

Well i am just new to XML . So, i just need some help.
I have a XML file with a sample structure as follows :

<?xml version="1.0" encoding="UTF-8"?>
<Company>
      <Employee>
            <EmployeeDetails>      
                  <name>A</name>
                  <code>001</code>
                  <Designation>SET</Designation>
                  <place>PLACE1</place>
            </EmployeeDetails>      
            <EmployeeDetails>      
                  <name>B</name>
                  <code>002</code>
                  <Designation>SE</Designation>
                  <place>PLACE2</place>
            </EmployeeDetails>            
      </Employee>
</Company>

i am able to retrieve these values to a JSP and Display them in order.

Now i've a a few text fields to enter new data in the JSP .
How do i Enter these values entered in the JSP to the XML file in the same structure. Can anyone give me some idea regarding this. Iam using the APIs in org.xml.*, org.w3c.*, javax.xml.parsers.*.

Thanx in advance
Regards
GPR27
 
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Question by:GPR27
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LVL 6

Expert Comment

by:PeterCiuffetti
ID: 9779364
Hi,

I posted an answer to a previous question that covered the same topic here: http://www.experts-exchange.com/Web/Web_Languages/XML/Q_11806358.html
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Accepted Solution

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PeterCiuffetti earned 90 total points
ID: 9779672
I think I may have misunderstood the original question.  I see now you want to add XML fragmests where the input comes from a form processed by JSP.  Assuming you have your original XML in a DOM, you add elements to the DOM this way:

        Element company = dom.getDocumentElement();
        Element employee = dom.createElement( "Employee" );
        Element employeeDetails = dom.createElement( "EmployeeDetails" );

        if ( request.getParameter("name") != null ) {
                name_text = request.getParameter("name");
                Element name = dom.createElement( "name" );
                Text text = dom.createTextNode( name_text );
                name.appendChild( text );
                employeeDetails.appendChild( name );
        }

        if ( request.getParameter("code") != null ) {
                code_text = request.getParameter("code");
                Element code = dom.createElement( "code" );
                Text text = dom.createTextNode( code_text );
                code.appendChild( text );
                employeeDetails.appendChild( code );
        }

        if ( request.getParameter("designation") != null ) {
                designation_text =  request.getParameter("designation");
                Element designation = dom.createElement( "Designation" );
                Text text = dom.createTextNode( designation_text );
                designation.appendChild( text );
                employeeDetails.appendChild( designation );
        }

        if ( request.getParameter("place") != null ) {
                place_text =  request.getParameter("place");
                Element place = dom.createElement( "Place" );
                Text text = dom.createTextNode( place_text );
                place.appendChild( text );
                employeeDetails.appendChild( place );
        }

        employee.appendChild( employeeDetails );
        company.appendChild( employee );
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Author Comment

by:GPR27
ID: 9784720
Hi  PeterCiuffetti

Your comment is of  a great help to me.

Thanx a lot.

Regards
GPR27
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Author Comment

by:GPR27
ID: 9785111
Hi

The idea suggested to write into a  XML file, is not writing into the XML file ??? i guess, it is getting lost in the dom object.

My intention is to get the data written into the XML file.. currently i open th exml file using the DocumantBuilderFactory with "parse" function, is this correct ???  OR do i need to open the XML File in the write mode using some other API ???

Please suggest

Regards
GPR27
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LVL 6

Expert Comment

by:PeterCiuffetti
ID: 9787357
Yes, the DOM is a memory object.  To write it out after modifying it, you have to use a serializer.  See http://xml.apache.org/xerces-j/apiDocs/org/apache/xml/serialize/XMLSerializer.html

import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.Document;
import org.apache.xml.serialize.OutputFormat;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.IOException;

/**
 * Utility class to serialize a DOM to an OutputStream
 */
public class DOMSerializer
{
    /**
     * Serializer the supplied DOM
     * @param Document - the DOM to serialize
     * @param OutputStream - stream to serialize to
     * @param boolean - true if XML entities are escaped
     * @param String[] - elements in which not to escape entities null if escapeEntities is true
     * @param boolean - true if pretty print in, use only if going to file
     */
    public static void serialize( Document dom,
                                  OutputStream output,
                                  boolean escapeEntities,
                                  String[] nonEscapingElements,
                                  boolean prettyPrint ) throws IOException
    {
        // Set up output format depending on options
        OutputFormat format = new OutputFormat( dom, null, prettyPrint );
        // Always preserve whitespace
        format.setPreserveSpace( true );
        if( escapeEntities )
        {
            format.setNonEscapingElements( nonEscapingElements );
        }

        // Now create a serializer, give it the output
        XMLSerializer serializer = new XMLSerializer( format );
        serializer.setOutputCharStream( new OutputStreamWriter(output, "UTF-8"));
        // Do it
        serializer.serialize( dom );
    }


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