asked on

writing values into a XML file from a JSP

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

PeterCiuffetti

Hi,

I posted an answer to a previous question that covered the same topic here: https://www.experts-exchange.com/questions/11806358/Passing-parameter-to-stylesheet-from-servlet.html

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PeterCiuffetti

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GPR27

ASKER

Hi PeterCiuffetti

Your comment is of a great help to me.

Thanx a lot.

Regards
GPR27

GPR27

ASKER

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

PeterCiuffetti

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 );
}