如何将使用XPath的这种简单C＃方法转换为Java方法？

Question

I am pretty new in the use of XPath in Java and I don't know C# .

In this time I have to convert some C# methods that use XPath into Java methods and I have some doubts about it.

In a C# method I found the following lines of code:

System.Xml.XmlNode element;
System.Xml.XmlNode filter;

filter = _document.CreateElement("filter");
element = _document.CreateElement("name");
element.InnerText = es.Descrizione;
filter.AppendChild(element);

and I am trying to convert it into Java code.

I think that the first 2 lines can be translated as:

Element element;
Element filter;

(it is simple a declaration of a Jdom Element objects)

But I have many doubts about how translate these lines in Java:

filter = _document.CreateElement("filter");
element = _document.CreateElement("name");

filter.AppendChild(element);

Can you help me?

Tnx

Andrea

Answer 1

The Java equivalent would be the following:

import javax.xml.parsers.*;
import org.w3c.dom.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        Element element;                            // System.Xml.XmlNode element;
        Element filter;                             // System.Xml.XmlNode filter;

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();

        Document _document = db.newDocument();
        filter = _document.createElement("filter"); // filter = _document.CreateElement("filter");
        element = _document.createElement("name");  // element = _document.CreateElement("name");
        element.setTextContent(es.Descrizione);     // element.InnerText = es.Descrizione;
        filter.appendChild(element);                // filter.AppendChild(element);
        _document.appendChild(filter);
    }

}

Answer 2

Why are you mentioning XPath? I don't see any use of it. If you want to continue to use the DOM API then you could do that even in Java with http://docs.oracle.com/javase/7/docs/api/org/w3c/dom/package-summary.html and your code would be

import org.w3c.dom;


Element element;
Element filter;

filter = _document.createElement("filter");
element = _document.createElement("name");
element.setTextContent(es.Descrizione);
filter.appendChild(element);

If you want to use JDOM then you would need to change the approach and instead of using the DOM based factory methods like document.createElement(..) you would simply use constructor methods like new Element(..) .