java search specific attribut name in the xml file

I wouldlike to search in my xml file all attribut (name) without use element tag node :

xml :

<test 1><test1/>
<test2> <test2/>
<test 3 id="aaa"> </test3>
<test 5> </test5>
<test 6 id="bbb" name="ijof"> </test6>

JAVA :

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new File(path));
root = document.getDocumentElement();

String attribut = root.getAttribute("name");
System.out.println(attribut); // Expected ijof

Did you execute your code at least once? I dont't think so. Otherwise you would have surely noticed that your XML cannot be parsed.

There are several flaws in your example XML:

1. No root element.
2. Wrong end tags: It should be <test1></test1> and not <test1><test1/>.
3. Element names must not contain whitespace and start and end tag must match. It should be <test5> </test5> and not <test 5> </test5>

Apart of that you can use XPATH to get all elements with a name attribute.

Here is a complete example with the XML as a string but this should be irrelevant:

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import java.io.IOException;
import java.io.StringReader;
public class FindNameAttribute {
private static final String XML =
"<root>\n" +
"  <test1></test1>\n" +
"  <test2> </test2>\n" +
"  <test3 id=\"aaa\"> </test3>\n" +
"  <test4 name=\"4\"/>\n" +
"  <test5> </test5>\n" +
"  <test6 id=\"bbb\" name=\"ijof\"> </test6>\n" +
"  <test7 id=\"bbb\"><child name=\"childname\"/> </test7>\n" +
"</root>\n";
public static void main(String[] args) {
System.out.println(XML);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try {
builder = factory.newDocumentBuilder();
StringReader reader = new StringReader(XML);
InputSource source = new InputSource(reader);
Document document = builder.parse(source);
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList) xpath.evaluate("//*[@name]", document, XPathConstants.NODESET);
for(int i = 0; i < nodes.getLength(); i++) {
Element el = (Element) nodes.item(i);
String elementName = el.getTagName();
String nameAttribute = el.getAttribute("name");
System.out.println(String.format("Element name: %s, name attribute: %s", elementName, nameAttribute));
}
} catch (ParserConfigurationException | SAXException | IOException | XPathExpressionException e) {
e.printStackTrace();
}
}
}

This is the output:

<root>
<test1></test1>
<test2> </test2>
<test3 id="aaa"> </test3>
<test4 name="4"/>
<test5> </test5>
<test6 id="bbb" name="ijof"> </test6>
<test7 id="bbb"><child name="childname"/> </test7>
</root>
Element name: test4, name attribute: 4
Element name: test6, name attribute: ijof
Element name: child, name attribute: childname

The relevant XPATH expression is: //*[@name]

• //: Looks for every element in the document
• *: Placeholder for element name. Each name matches.
• *[@name]: The [] denotes the predicate. We only want elements with a name attribute.
• @: Means the following name is the name of an attribute. Whithout it would be interpreted as an element name