Re: How to compare numeric values between two xml files?

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <>
Sun, 11 Nov 2007 22:09:50 -0500
Arne VajhHj wrote:

www wrote:

I have a xml file, something like:

<?xml version="1.0" encoding="UTF-8"?>
<event date="1985-09-01" flag="1" time="06:00:00" value="1.400"/>
<event date="1985-09-01" flag="1" time="12:00:00" value="2.500"/>
<event date="1985-09-01" flag="1" time="18:00:00" value="5.900"/>
<event date="1985-09-02" flag="1" time="00:00:00" value="3.000"/>

Another xml file:

<?xml version="1.0" encoding="UTF-8"?>
<event date="1985-09-01" flag="1" time="06:00:00" value="1.500"/>
<event date="1985-09-01" flag="1" time="12:00:00" value="2.600"/>
<event date="1985-09-01" flag="1" time="18:00:00" value="5.950"/>
<event date="1985-09-02" flag="1" time="00:00:00" value="3.100"/>

I hope to compare, between the two files, date, time and value(in
JUnit test). Hopefully, when comparing the values, I can set some
error tolerance. Is there a way to do it? I don't want to extract
substring from each line, because the exact locations(the index) can
be different in next run.

I hope this will get you started.

I forgot the code.


import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.xpath.XPathAPI;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

public class XmlDiff {
     public static void main(String[] args) throws Exception {
         DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
         DocumentBuilder db = dbf.newDocumentBuilder();
         Document doc1 = db.parse("C:\\ser1.xml");
         Document doc2 = db.parse("C:\\ser2.xml");
         NodeList events1 = doc1.getElementsByTagName("event");
         for(int i = 0; i < events1.getLength(); i++) {
             Element event1 = (Element) events1.item(i);
             String d1 = event1.getAttribute("date");
             String t1 = event1.getAttribute("time");
             String v1 = event1.getAttribute("value");
             Element event2 =
"//Series/event[@date='" + d1 + "' and @time='" + t1 + "']");
             if(event2 != null) {
                 String v2 = event2.getAttribute("value");
                 if(!v1.equals(v2)) {
                     System.out.println(d1 + " " + t1 + " changed from "
+ v1 + " to " + v2);
                 } else {
                     System.out.println(d1 + " " + t1 + " identical");
             } else {
                 System.out.println(d1 + " " + t1 + " missing");


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