modifing a xml file using SAX parser

Question

Can we modify or update xml file using SAX parser. If yes, please provide me the sample code or any helpful link

my xml file looks like this

<vertices>
<vertex>
<name>user1</name>
<type>Ashok</type>
<nickname>nickuser1</nickname>
</vertex>
</vertices>"

I want to change "user1" to say "user2". Help me out

You have many options , modifying the XML its best suited for a dom parser. Sax is intended for quick read access with minimal memory overhead , not for writing documents. http://www.mkyong.com/java/how-to-modify-xml-file-in-java-dom-parser/ http://stackoverflow.com/questions/12459712/modify-xml-file-with-xpath — Kenneth Clark, May 09 '14 at 08:39
This question helped me with the same issue http://stackoverflow.com/questions/13687799/parsing-and-modifying-xml-string-with-sax-parser — a.hrdie, May 09 '14 at 08:43
@ Kenneth Clark if I use DOM entire xml file will be loaded that should not happen in my case. And does this xpath load the entire xml file? — user3322698, May 09 '14 at 08:56
@ a.hrdie: this link produces the updated result but I want to put the updated result into the same xml file. — user3322698, May 09 '14 at 09:05

score 2 · Answer 1 · edited May 23 '17 at 12:22

2

If you are reluctant to use a DOM parser because you have a large XML you can use the XPATH or XLST to transform the xml.

What is best way to change one value in XML files in Java?

edited May 23 '17 at 12:22

Community

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answered May 09 '14 at 09:35

Kenneth Clark

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score 0 · Answer 2 · answered Apr 27 '16 at 00:33

Below is the code to do it in vtd-xml... It is a lot more efficient/simpler than DOM or SAX based solutions... for further reading here is an article entitled manipulate XML the Ximple Way...

import java.io.*;
public class modifyXML {
    public static void main(String[] s) throws VTDException, IOException{
        VTDGen vg = new VTDGen();
        if (!vg.parseFile("input.xml", false))
            return;
        VTDNav vn = vg.getNav();
        AutoPilot ap = new AutoPilot(vn);
        ap.selectXPath("/vertices/vertex/name/text()");
        XMLModifier xm = new XMLModifier(vn);
        // using XPath
        int i=ap.evalXPath();
        if(i!=-1){
            xm.updateToken(i, "user2");
        }
        xm.output("output.xml");
    }
}

modifing a xml file using SAX parser

2 Answers2