How Java uses JDOM parser to read XML files and obtain Document objects
To read an XML file and obtain a Document object using a JDOM parser, follow the following steps:
1. Add Maven dependency: Add the following dependency relationships in the pom.xml file of the project:
<dependency>
<groupId>org.jdom</groupId>
<artifactId>jdom2</artifactId>
<version>2.0.6</version>
</dependency>
2. Create an XML sample file: Assuming we have an XML file called "example. xml", the content is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<root>
<element1>Hello</element1>
<element2>World</element2>
<element3>
<subelement>Example</subelement>
</element3>
</root>
3. Use the JDOM parser to read the XML file and obtain the Document object:
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;
import java.io.File;
public class JDOMExample {
public static void main(String[] args) {
try {
File file = new File("example.xml");
SAXBuilder saxBuilder = new SAXBuilder();
Document document = saxBuilder.build(file);
Element rootElement = document.getRootElement();
System.out.println("Root element name: " + rootElement.getName());
Element element1 = rootElement.getChild("element1");
System.out.println("element1 value: " + element1.getValue());
Element element3 = rootElement.getChild("element3");
Element subElement = element3.getChild("subelement");
System.out.println("subelement value: " + subElement.getValue());
} catch (Exception e) {
e.printStackTrace();
}
}
}
The above code first specifies the XML file to be parsed through the File object, and then creates a new XML parser using SAXBuilder. Next, call the 'saxBuilder. build (file)' method to parse the file and return a Document object. By using the Document object, we can obtain the root element, child element, and print their values.
Note that this example is only a simple demonstration, and if more complex XML operations are required, more detailed code may be required.
