xml在java中使用dom更新值

Question

我必须更改在eElement中找到的与旧值匹配的值。

我试用eElement.setAttribute(...)功能和setTextContent功能，但它不起作用。

如果我们假设新值存储在名为newValue的字符串变量中，我该如何让我的代码运行？

NodeList leaf = doc.getElementsByTagName(relativeLeaf); 
System.out.println(leaf.item(0).getNodeName()); 
for (int temp = 0; temp < leaf.getLength(); temp++) { 
    Node nNode = leaf.item(temp); 
    if (nNode.getNodeType() == Node.ELEMENT_NODE) { 
     Element eElement = (Element) nNode; 
     String oldValueInCells = eElement.getElementsByTagName(relativeLeaf).item(0).getTextContent(); 
     System.out.println("old tag : " + eElement.getElementsByTagName(relativeLeaf).item(0).getTextContent()); 
     if(oldValueInCells.contentEquals(oldVal)){ 
      // #### 
      // here i have to change tha value in eElement 
      // where it match with the old Value with a new one  
     } 
    } 
} 

Answer 1

基于文档，我认为你可以得到节点元素，然后设置一个值。你首先应该得到的节点元素是这样的：

Node node = eElement.getElementsByTagName(relativeLeaf).item(0); //You get the node here so you can use it as well to create OldValueInCells 
String oldValueInCells = node.getTextContent(); 
     System.out.println("old tag : " + oldValueInCells); 
     if(oldValueInCells.contentEquals(oldVal)){ 
      // #### 
      // here i have to change tha value in eElement 
      // where it match with the old Value with a new one  
      node.setTextContent("new value"); //Here you will set the value to the node 
     } 

来源：https://docs.oracle.com/javase/7/docs/api/org/w3c/dom/Node.html