如何在Java中修改xml标记的特定值？

Question

我是xml.i的新手，我使用了xml文件，如下所示：

<?xml version="1.0" encoding="UTF-8" ?> 
      - <root>
      - <key>
           <Question>Is the color of the car</Question> 
           <Ans>black?</Ans> 
       </key>
     - <key>
           <Question>Is the color of the car</Question> 
           <Ans>black?</Ans> 
       </key>
     - <key>
           <Question>Is the news paper</Question> 
           <Ans>wallstreet?</Ans> 
      </key>
    - <key>
          <Question>fragrance odor</Question> 
          <Ans>Lavendor?</Ans> 
     </key>
   - <key>
          <Question>Is the baggage collector available</Question> 
         <Ans /> 
     </key>
  </root>

从上面的xml我只想更改

             <Ans>wallstreet?</Ans> as <Ans>WonderWorld</Ans>.

我该如何更改walltreet？作为WonderWorld？通过我的Java应用程序。

我写了如下所示的java方法：

  public void modifyNodeval(){
 try{
        DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
        Document doc = docBuilder.parse(new File(path));
        Node nodes1 = doc.getElementsByTagName("*");
        for(int j=0;j<nodes1.getLength();j++)
        {
            //Get the staff element by tag name directly
            Node nodes = doc.getElementsByTagName("key").item(j);
            //loop the staff child node
            NodeList list = nodes.getChildNodes();

            for (int i = 0; i != list.getLength(); ++i)
            {
                Node child = list.item(i);

               if (child.getNodeName().equals("Ans")) {

                   child.getFirstChild().setNodeValue("WonderWorld") ;
                   System.out.println("tag val modified success fuly");
               }

           }
       }
       TransformerFactory transformerFactory = TransformerFactory.newInstance();
       Transformer transformer = transformerFactory.newTransformer();
       DOMSource source = new DOMSource(doc);
       StreamResult result = new StreamResult(path);
       transformer.transform(source, result);
   }
   catch (Exception e) 
   {
       e.printStackTrace();
   }
}

通过使用上面的代码，我能够将所有标签文本更改为奇迹世界，但是我的意图是我只想更改walltreet？作为WonderWorld。

任何人请帮助我.....

Answer 1

用

if (child.getNodeName().equals("Ans") && child.getTextContent().equals("wallstreet?"))

作为您的条件。