In this article we will show you the solution of how to get tag value from xml string in java, you can use JAXP & either XPath or DOM parsers in Java to obtain tag values from an XML string. Include the required JAR files in your project first.

The XML string should next be parsed using a DocumentBuilder object to produce a Document object.

You have two choices for the Document object: XPath or DOM. To find the desired tag, build an XPath object and give the XPath expression.

To get the value of the tag, use the evaluate() method. As an alternative, you can acquire a NodeList containing every instance of the tag by using the DOM function getElementsByTagName().

Utilize the getTextContent() method on the relevant node to retrieve the desired tag value.

Make sure tagname is replaced with the correct name of the XML tag you want to obtain.

It's crucial to keep in mind that the offered code snippets count on there only being one instance of the tag in the XML.

You can effectively extract tag values from an XML string in Java by following these steps. Now we'll talk about the idea of getting a tag value from an XML text in Java.

Step By Step Guide On How To Get Tag Value From XML String In Java :-

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
public class XMLParserExample {
    public static void main(String[] args) {
        try {
            String xmlString = "<root><tagname>Hello, World!</tagname></root>";
            // Create a DocumentBuilder object
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(new InputSource(new StringReader(xmlString)));
            // Create an XPath object
            XPath xpath = XPathFactory.newInstance().newXPath();
            // Specify the XPath expression
            String expression = "//tagname";
            // Retrieve the tag value using XPath
            String tagValue = xpath.evaluate(expression, document);
            System.out.println("Tag Value: " + tagValue);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

1. Along with additional necessary classes from the org.w3c.dom and org.xml.sax packages, we import the necessary classes from the javax.xml.parsers and javax.xml.xpath packages.
2. The main() function of the XMLParserExample class, which we define, is where the execution begins.
3. We declare a sample XML string, xmlString, inside the main() method to represent the XML data we wish to parse and extract information from.
4. Using newInstance(), which offers a factory API for producing a DocumentBuilder object, we then create a DocumentBuilderFactory object factory.
5. The factory's newDocumentBuilder() function is used to create the DocumentBuilder object builder.
6. To create a Document object document, we wrap the XML string xmlString in a StringReader and deliver it to the builder's parse() method.
7. Using the implementation of the XPath specification provided by XPathFactory.newInstance().newXPath(), we build an XPath object called xpath.
8. Using the expression variable, we define the XPath expression //tagname.
9. Regardless of where the <tagname> element is located in the XML structure, this statement indicates that we wish to obtain its value.
10. To retrieve the tag value, we call the XPath objects evaluate() method passing the expression and document as inputs.
11. The tagValue variable holds the resultant value.
12. At last, we print the obtained tag value on the console using System.out.println()
13. In order to handle any potential exceptions that can arise during parsing or evaluating the data, we included exception handling. If an exception is handled, we print the stack trace.

Conclusion :-

Thus, we were able to understand how to obtain a tag value from an XML text in Java.

Additionally, we discovered that the JAXP framework offers a strong and adaptable method for parsing and extracting data from XML texts in Java.

You can find and get the values of particular XML tags by utilising XPath or DOM parsers.

I hope this article on how to get tag value from xml string in java helps you and the steps and method mentioned above are easy to follow and implement.