如何在 Java 中获取 XML 元素的兄弟元素(使用 DOM 解析器)? [英] How can i get the siblings of an XML element in Java (using the DOM parser)?

问题描述

我想在 Java 中获取 XML 元素的兄弟元素.

I would like to get the siblings of an XML element in Java.

xml文件如下:

  <parent>
    <child1> value 1 </child1>
    <child2> value 2 </child2>
    <child3> value 3 </child3>
  </parent>

我在 JAVA 中使用 DOM 解析器的代码如下:

My code in JAVA with DOM parser is as follows:

 package dom_stack;

 import java.io.File;
 import java.io.IOException;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;
 import org.w3c.dom.Document;
 import org.w3c.dom.NodeList;
 import org.xml.sax.SAXException;


 public class DOM_stack {


     public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {


      File file = new File("root.xml");
      if (file.exists()){
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

            Document doc;
             doc = dbf.newDocumentBuilder().parse("root.xml");


            NodeList elemNodeList = doc.getElementsByTagName("child1");                 

            for(int j=0; j<elemNodeList.getLength(); j++) {

                System.out.println("The node's value that you are looking now is : " +  elemNodeList.item(j).getTextContent());
                System.out.println(" Get the Name of the Next Sibling " + elemNodeList.item(j).getNextSibling().getNodeName());
                System.out.println(" Get the Value of the Next Sibling " + elemNodeList.item(j).getNextSibling().getNodeValue());

            }


        }//if file exists
     }
    }

不幸的结果是:

    run:
    The node's value that you are looking now is :  value 1 
     Get the Name of the Next Sibling #text
     Get the Value of the Next Sibling 

它应该是:

    run:
    The node's value that you are looking now is :  value 1 
     Get the Name of the Next Sibling child2
     Get the Value of the Next Sibling value2

那么，我怎样才能获得理想的输出?

So, how can i get the desirable output?

谢谢，提前

推荐答案

<parent>
  <child1> value 1 </child1>
  <child2> value 2 </child2>
  <child3> value 3 </child3>
</parent>

你得到的是空白 textchild1 和 child2 元素之间的节点.

What you are getting is the whitespace text node between the child1 and child2 elements.

您需要继续走兄弟姐妹以跳过空格、注释等，以获得下一个元素节点:

You need to keep walking the siblings to skip over whitespace, comments, etc, to get the next element node:

Node child1 = elemNodeList.item(j);
Node sibling = child1.getNextSibling();
while (!(sibling instanceof Element) && sibling != null) {
  sibling = sibling.getNextSibling();
}
System.out
      .println(" Get the Name of the Next Sibling " + sibling.getNodeName());
System.out
      .println(" Get the Value of the Next Sibling " + sibling.geTextContent());

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