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Judul : How To Compare 2 Xml Files Inward Coffee - Xmlunit Example
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How To Compare 2 Xml Files Inward Coffee - Xmlunit Example

The XMLUnit library tin live on used to compare 2 XML files inwards Java. Similar to JUnit, XMLUnit tin also live on used to attempt XML files for comparing past times extending the XMLTestcase class. It is a rich library in addition to provides a detailed comparing of XML files. Btw, comparing XML is completely dissimilar than comparing String inwards Java or comparing object using equals(), every bit 2 XML which contains dissimilar comment in addition to whitespace tin live on equals, which is non truthful for String or grapheme comparison. Also spell comparing XML files, it's real of import to know just which content or move is dissimilar in addition to XMLUnit non entirely shows the content which is dissimilar but also XPath of elements which is getting compared.

The view in addition to mortal of XMLUnit are the DifferenceEngine shape but nosotros won't usage it directly. Instead, you lot volition usage Diff in addition to DetailedDiff the 2 of import classes for XML comparison. They render comparing engine for comparing XML. The XMLUnit library non entirely compares consummate XML document but also tin perform a lot of useful activities related to XPath e.g. it tin banking concern friction match if an XPATH exists or non exists. It tin fifty-fifty banking concern friction match if XPath contains expected value or not.

The XMLUnit library tin also render validation support. So, if you lot desire to banking concern friction match if an XML file confirms to DTD or not, you lot tin exercise that using XMLUnit's Validator class. The default validation is using DTD but if you lot desire to confirm against XSD schema, you lot tin exercise that past times using pick Validator.useXMLSChema flag.

Java programme to compare 2 XML documents inwards Java.

It internally uses JAXP for XSLT transformation in addition to XPath evaluation. It at to the lowest degree needs JAXP 1.2 which is included inwards Java 1.5 but if you lot desire to usage to a greater extent than advanced XPath engine based upon JAXP 1.3 in addition to thence you lot quest to include Java 1.5 or higher version inwards the classpath. In this Java in addition to XML tutorial, you lot volition acquire how to compare 2 XML documents inwards Java past times next a uncomplicated illustration using XMLUnit.Overall it's a nice, handy utility library for testing in addition to comparing XML files inwards Java applications.

Here is consummate Java programme to compare 2 XML documents using XMLUnit library. In this example, nosotros lead keep 2 XML files source.xml in addition to target.xml, afterward is created past times copying the quondam file in addition to I lead keep made i change, inwards a telephone publish to compare these 2 XML files. In club to compare in addition to demonstrate differences betwixt XML documents, I lead keep created 2 static methods compareXML() in addition to printDifferences().

The code to read XML file is real similar to the code of reading text files inwards Java, nosotros are reading XML files every bit InputStream in addition to passing it to compareXML() every bit Reader object. Real XML comparing begins inwards this method alongside Diff in addition to DetailedDiff class.

The DetailedDiff render all differences every bit List, if at that topographic point is no divergence than the size of this List would live on aught in addition to nosotros tin order 2 XML files are identical inwards data. printDifference() method takes this List of Differences in addition to prints it on Console. If you lot human face divergence provided past times XMLUnit, you lot volition notice that it shows both what is the divergence in addition to where is that divergence occur past times showing consummate XPATH.

Java Program to compare XML files

package test;  import java.io.BufferedReader; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.io.Reader; import java.util.List; import org.custommonkey.xmlunit.DetailedDiff; import org.custommonkey.xmlunit.Diff; import org.custommonkey.xmlunit.Difference; import org.xml.sax.SAXException;  /**   *   * Java programme to compare 2 XML files using XMLUnit illustration    * @author Javin Paul   */ public class XMLComparator {         public static void main(String args[]) throws FileNotFoundException,                                                    SAXException, IOException {               // reading 2 xml file to compare inwards Java program         FileInputStream fis1 = new FileInputStream("C:/test/source.xml");         FileInputStream fis2 = new FileInputStream("C:/test/target.xml");               // using BufferedReader for improved performance         BufferedReader  rootage = new BufferedReader(new InputStreamReader(fis1));         BufferedReader  target = new BufferedReader(new InputStreamReader(fis2));               //configuring XMLUnit to ignore white spaces         XMLUnit.setIgnoreWhitespace(true);               //comparing 2 XML using XMLUnit inwards Java         List differences = compareXML(source, target);               //showing differences establish inwards 2 xml files         printDifferences(differences);         }           public static List compareXML(Reader source, Reader target) throws                   SAXException, IOException{               //creating Diff instance to compare 2 XML files         Diff xmlDiff = new Diff(source, target);               //for getting detailed differences betwixt 2 xml files         DetailedDiff detailXmlDiff = new DetailedDiff(xmlDiff);               return detailXmlDiff.getAllDifferences();     }       public static void printDifferences(List differences){         int totalDifferences = differences.size();         System.out.println("===============================");         System.out.println("Total differences : " + totalDifferences);         System.out.println("================================");               for(Difference divergence : differences){             System.out.println(difference);         }     } }

You tin encounter that nosotros are showtime printing total publish of differences betwixt 2 XML files in addition to and thence printing each dissimilar past times going through the List which contains each Difference.

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one trace of piece of employment XML file for comparison. Now our target.xml volition human face like

<employees>  <employee id="1">    <name>James</name>      <department>Sales</department>    <phone>9843267462</phone>     </employee> </employees>

Output:

=============================== Total differences : 13 ================================ Expected publish of tiddler nodes '3' but was '1' -  comparing at /employees[1] to at /employees[1]

All these differences spell comparing rootage in addition to target XML files comes because of white infinite in addition to they are non truthful differences.

Since inwards real-world scenario, it's ever possible to compare 2 XML files alongside a divergence inwards whitespace, it's best to ignore white infinite spell comparing XML files in addition to thankfully XMLUnit tin live on configured to ignore whitespace past times using static method XMLUnit.setIgnoreWhitespace(true).

Now if you lot re-run this Java programme after adding a telephone phone to XMLUnit.setIgnoreWhitespace(true), alongside the same input, you lot volition i time once to a greater extent than encounter a unmarried divergence every bit shown below.

=============================== Total differences : 1 ================================ Expected text value '8034832190' but was '9843267462

Similarly you lot tin also ignore comments past times calling XMLUnit.setIgnoreComments(true) earlier comparing XML files inwards Java.  You tin fifty-fifty usage overloaded method XMLUnit.compareXML(source, target) to compare 2 XML files. This method takes Document, Reader, or String to acquire XML content.


That's all on how to compare 2 XML files inwards Java using XMLUnit example. XMLUnit library is rich in addition to powerful in addition to provides several other options to compare XML documents including differences inwards XPath, comparing transformations etc.

XMLUnit library tin also live on used every bit JUnit past times extending XMLTestCase class, which provides methods similar assertXMLEqual(org.w3c.dom.Document source, org.w3c.dom.Document target) in addition to several other overloaded versions for testing XML files. You tin banking concern friction match if an XPath exists or non in addition to whether it incorporate the expected value or not. It's a real expert tool to write automated tests if your programme is generating or modifying XML files.

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Thanks for reading this tutorial thence far, if you lot actually similar this tutorial in addition to thence delight similar our Facebook page in addition to don't forget to part alongside your friends in addition to colleagues. If you lot lead keep whatever proposition or feedback in addition to thence delight drib a comment. If you lot but desire to exercise i affair at the moment, in addition to thence read Test Driven to acquire to a greater extent than practical in addition to automated ways to attempt your applications. 

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