t uses these maven dependencies
<dependency>
<groupId>org.xmlunit</groupId>
<artifactId>xmlunit-core</artifactId>
<version>2.0.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.xmlunit</groupId>
<artifactId>xmlunit-matchers</artifactId>
<version>2.0.0</version>
<scope>test</scope>
</dependency>
..and here's the test code
import static org.junit.Assert.assertThat;
import static org.xmlunit.matchers.CompareMatcher.isIdenticalTo;
import org.xmlunit.builder.Input;
import org.xmlunit.input.WhitespaceStrippedSource;
public class SomeTest extends XMLTestCase {
@Test
public void test() {
String result = "<root></root>";
String expected = "<root> </root>";
// ignore whitespace differences
// https://github.com/xmlunit/user-guide/wiki/Providing-Input-to-XMLUnit#whitespacestrippedsource
assertThat(result, isIdenticalTo(new WhitespaceStrippedSource(Input.from(expected).build())));
assertThat(result, isIdenticalTo(Input.from(expected).build())); // will fail due to whitespace differences
}
}
Another Extendedn code;
import java.io.ByteArrayInputStream;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
public class XmlDiff
{
private boolean nodeTypeDiff = true;
private boolean nodeValueDiff = true;
public boolean diff( String xml1, String xml2, List<String> diffs ) throws Exception
{
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
dbf.setCoalescing(true);
dbf.setIgnoringElementContentWhitespace(true);
dbf.setIgnoringComments(true);
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc1 = db.parse(new ByteArrayInputStream(xml1.getBytes()));
Document doc2 = db.parse(new ByteArrayInputStream(xml2.getBytes()));
doc1.normalizeDocument();
doc2.normalizeDocument();
return diff( doc1, doc2, diffs );
}
/**
* Diff 2 nodes and put the diffs in the list
*/
public boolean diff( Node node1, Node node2, List<String> diffs ) throws Exception
{
if( diffNodeExists( node1, node2, diffs ) )
{
return true;
}
if( nodeTypeDiff )
{
diffNodeType(node1, node2, diffs );
}
if( nodeValueDiff )
{
diffNodeValue(node1, node2, diffs );
}
System.out.println(node1.getNodeName() + "/" + node2.getNodeName());
diffAttributes( node1, node2, diffs );
diffNodes( node1, node2, diffs );
return diffs.size() > 0;
}
/**
* Diff the nodes
*/
public boolean diffNodes( Node node1, Node node2, List<String> diffs ) throws Exception
{
//Sort by Name
Map<String,Node> children1 = new LinkedHashMap<String,Node>();
for( Node child1 = node1.getFirstChild(); child1 != null; child1 = child1.getNextSibling() )
{
children1.put( child1.getNodeName(), child1 );
}
//Sort by Name
Map<String,Node> children2 = new LinkedHashMap<String,Node>();
for( Node child2 = node2.getFirstChild(); child2!= null; child2 = child2.getNextSibling() )
{
children2.put( child2.getNodeName(), child2 );
}
//Diff all the children1
for( Node child1 : children1.values() )
{
Node child2 = children2.remove( child1.getNodeName() );
diff( child1, child2, diffs );
}
//Diff all the children2 left over
for( Node child2 : children2.values() )
{
Node child1 = children1.get( child2.getNodeName() );
diff( child1, child2, diffs );
}
return diffs.size() > 0;
}
/**
* Diff the nodes
*/
public boolean diffAttributes( Node node1, Node node2, List<String> diffs ) throws Exception
{
//Sort by Name
NamedNodeMap nodeMap1 = node1.getAttributes();
Map<String,Node> attributes1 = new LinkedHashMap<String,Node>();
for( int index = 0; nodeMap1 != null && index < nodeMap1.getLength(); index++ )
{
attributes1.put( nodeMap1.item(index).getNodeName(), nodeMap1.item(index) );
}
//Sort by Name
NamedNodeMap nodeMap2 = node2.getAttributes();
Map<String,Node> attributes2 = new LinkedHashMap<String,Node>();
for( int index = 0; nodeMap2 != null && index < nodeMap2.getLength(); index++ )
{
attributes2.put( nodeMap2.item(index).getNodeName(), nodeMap2.item(index) );
}
//Diff all the attributes1
for( Node attribute1 : attributes1.values() )
{
Node attribute2 = attributes2.remove( attribute1.getNodeName() );
diff( attribute1, attribute2, diffs );
}
//Diff all the attributes2 left over
for( Node attribute2 : attributes2.values() )
{
Node attribute1 = attributes1.get( attribute2.getNodeName() );
diff( attribute1, attribute2, diffs );
}
return diffs.size() > 0;
}
/**
* Check that the nodes exist
*/
public boolean diffNodeExists( Node node1, Node node2, List<String> diffs ) throws Exception
{
if( node1 == null && node2 == null )
{
diffs.add( getPath(node2) + ":node " + node1 + "!=" + node2 + "\n" );
return true;
}
if( node1 == null && node2 != null )
{
diffs.add( getPath(node2) + ":node " + node1 + "!=" + node2.getNodeName() );
return true;
}
if( node1 != null && node2 == null )
{
diffs.add( getPath(node1) + ":node " + node1.getNodeName() + "!=" + node2 );
return true;
}
return false;
}
/**
* Diff the Node Type
*/
public boolean diffNodeType( Node node1, Node node2, List<String> diffs ) throws Exception
{
if( node1.getNodeType() != node2.getNodeType() )
{
diffs.add( getPath(node1) + ":type " + node1.getNodeType() + "!=" + node2.getNodeType() );
return true;
}
return false;
}
/**
* Diff the Node Value
*/
public boolean diffNodeValue( Node node1, Node node2, List<String> diffs ) throws Exception
{
if( node1.getNodeValue() == null && node2.getNodeValue() == null )
{
return false;
}
if( node1.getNodeValue() == null && node2.getNodeValue() != null )
{
diffs.add( getPath(node1) + ":type " + node1 + "!=" + node2.getNodeValue() );
return true;
}
if( node1.getNodeValue() != null && node2.getNodeValue() == null )
{
diffs.add( getPath(node1) + ":type " + node1.getNodeValue() + "!=" + node2 );
return true;
}
if( !node1.getNodeValue().equals( node2.getNodeValue() ) )
{
diffs.add( getPath(node1) + ":type " + node1.getNodeValue() + "!=" + node2.getNodeValue() );
return true;
}
return false;
}
/**
* Get the node path
*/
public String getPath( Node node )
{
StringBuilder path = new StringBuilder();
do
{
path.insert(0, node.getNodeName() );
path.insert( 0, "/" );
}
while( ( node = node.getParentNode() ) != null );
return path.toString();
}
Another Extract code:
import org.apache.xml.security.c14n.CanonicalizationException;
import org.apache.xml.security.c14n.Canonicalizer;
import org.apache.xml.security.c14n.InvalidCanonicalizerException;
import org.w3c.dom.Element;
import org.w3c.dom.bootstrap.DOMImplementationRegistry;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSSerializer;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;
import java.io.IOException;
import java.io.StringReader;
import static org.apache.xml.security.Init.init;
import static org.junit.Assert.assertEquals;
public class XmlUtils {
static {
init();
}
public static String toCanonicalXml(String xml) throws InvalidCanonicalizerException, ParserConfigurationException, SAXException, CanonicalizationException, IOException {
Canonicalizer canon = Canonicalizer.getInstance(Canonicalizer.ALGO_ID_C14N_OMIT_COMMENTS);
byte canonXmlBytes[] = canon.canonicalize(xml.getBytes());
return new String(canonXmlBytes);
}
public static String prettyFormat(String input) throws TransformerException, ParserConfigurationException, IOException, SAXException, InstantiationException, IllegalAccessException, ClassNotFoundException {
InputSource src = new InputSource(new StringReader(input));
Element document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(src).getDocumentElement();
Boolean keepDeclaration = input.startsWith("<?xml");
DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();
DOMImplementationLS impl = (DOMImplementationLS) registry.getDOMImplementation("LS");
LSSerializer writer = impl.createLSSerializer();
writer.getDomConfig().setParameter("format-pretty-print", Boolean.TRUE);
writer.getDomConfig().setParameter("xml-declaration", keepDeclaration);
return writer.writeToString(document);
}
public static void assertXMLEqual(String expected, String actual) throws ParserConfigurationException, IOException, SAXException, CanonicalizationException, InvalidCanonicalizerException, TransformerException, IllegalAccessException, ClassNotFoundException, InstantiationException {
String canonicalExpected = prettyFormat(toCanonicalXml(expected));
String canonicalActual = prettyFormat(toCanonicalXml(actual));
assertEquals(canonicalExpected, canonicalActual);
}
}
Another piece of code:
import org.apache.xml.security.c14n.CanonicalizationException;
import org.apache.xml.security.c14n.Canonicalizer;
import org.apache.xml.security.c14n.InvalidCanonicalizerException;
import org.w3c.dom.Element;
import org.w3c.dom.bootstrap.DOMImplementationRegistry;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSSerializer;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;
import java.io.IOException;
import java.io.StringReader;
import static org.apache.xml.security.Init.init;
import static org.junit.Assert.assertEquals;
public class XmlUtils {
static {
init();
}
public static String toCanonicalXml(String xml) throws InvalidCanonicalizerException, ParserConfigurationException, SAXException, CanonicalizationException, IOException {
Canonicalizer canon = Canonicalizer.getInstance(Canonicalizer.ALGO_ID_C14N_OMIT_COMMENTS);
byte canonXmlBytes[] = canon.canonicalize(xml.getBytes());
return new String(canonXmlBytes);
}
public static String prettyFormat(String input) throws TransformerException, ParserConfigurationException, IOException, SAXException, InstantiationException, IllegalAccessException, ClassNotFoundException {
InputSource src = new InputSource(new StringReader(input));
Element document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(src).getDocumentElement();
Boolean keepDeclaration = input.startsWith("<?xml");
DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();
DOMImplementationLS impl = (DOMImplementationLS) registry.getDOMImplementation("LS");
LSSerializer writer = impl.createLSSerializer();
writer.getDomConfig().setParameter("format-pretty-print", Boolean.TRUE);
writer.getDomConfig().setParameter("xml-declaration", keepDeclaration);
return writer.writeToString(document);
}
public static void assertXMLEqual(String expected, String actual) throws ParserConfigurationException, IOException, SAXException, CanonicalizationException, InvalidCanonicalizerException, TransformerException, IllegalAccessException, ClassNotFoundException, InstantiationException {
String canonicalExpected = prettyFormat(toCanonicalXml(expected));
String canonicalActual = prettyFormat(toCanonicalXml(actual));
assertEquals(canonicalExpected, canonicalActual);
}
}
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