使用SAX解析器修改xml文件

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

Answer 1

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?

Answer 2

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");
    }
}