java - 从 java DOM 获取文本值

Question

public static void printNode(NodeList nodeList, Document d) 
{
    for (int count = 0; count < nodeList.getLength(); count++)
    {           
        Node tempNode = nodeList.item(count);
        if (tempNode.getNodeType() == Node.ELEMENT_NODE) 
        {               
            if(tempNode.getChildNodes().getLength()==1)
                {
                    if(tempNode.getNodeName()=="param-name")
                    {                               
                        tempNode = tempNode.getNextSibling();
                        System.out.println(tempNode.getTextContent());  
                    }

                }
            else if (tempNode.getChildNodes().getLength() > 1)              
                {                       
                printNode(tempNode.getChildNodes(),d);                  
                }

            else
            {
            print("ELSE")
            }
        }
    }
}

我只想从此 xml.file 中的标签访问和获取文本值

<context-param>
    <param-name>A</param-name>
    <param-value>604800000</param-value>        
</context-param>

<context-param>
    <param-name>B</param-name>
    <param-value>50</param-value>
</context-param>

<context-param>
    <param-name>C</param-name>
    <param-value>1</param-value>        
</context-param>

但它不起作用，输出是 BLANKLINE _BLANKLINE_ BLANKLINE 。. . .

那么，有人有想法吗？

非常感谢你 。

Answer 1

您可能想尝试这样的事情：

public static void printNode(NodeList nodeList, Document d) {

  for (int i = 0; i < nodeList.getLength(); i++) {
    Node node = nodeList.item(i);

    if (node instanceof Element) {
      Element outerElement = (Element) node;
      NodeList paramElements = outerElement
          .getElementsByTagName("param-name");

      if (paramElements.getLength() != 1) {
        throw new RuntimeException("Wish I wasn't doing this by hand!");
      }

      Element element = (Element) paramElements.item(0);
      System.out.println(element.getTextContent());
    }
  }
}

Answer 2

您似乎想要与param-name节点同级的值。

1. 使用equals方法检查对象是否相等（not ==）
2. 空格创建文本节点

考虑使用XPath：

  public static void printNode(Document d) {
    try {
      NodeList values = (NodeList) XPathFactory.newInstance()
          .newXPath()
          .evaluate("//param-value/text()", d, XPathConstants.NODESET);

      for (int i = 0; i < values.getLength(); i++) {
        System.out.println(values.item(i).getTextContent());
      }
    } catch (XPathExpressionException e) {
      throw new IllegalStateException(e);
    }
  }