Java getChildNodes给出了意外的结果

我的XML看起来像这样-

<collected_objects>
        <object flag="complete" id="objId" version="1">
          <variable_value variable_id="varId">ValueGoesHere</variable_value>
          <reference item_ref="2"/>
        </object>
        <object comment="objComment" flag="complete" id="objId" version="1">
          <reference item_ref="1"/>
        </object>
</collected_objects>

我的问题是为什么“#的孩子是”分别是5岁和3岁？我不应该分别期待2和1吗？ 因为第一个对象有“

variable\u value

”和“

reference

”，而第二个对象只有“

reference

”

---

本质上，我的目的是处理“对象”的子对象。

确保节点子对象之间没有空格。空格被视为子节点，并作为子节点返回

测试如果

childNode.getNodeType() == Node.ELEMENT_NODE

---

应该足够了。

您只计算元素节点类型。如果您只对子元素感兴趣，可以更改代码以包含以下检查

 if (aNode.getNodeType() == Node.ELEMENT_NODE) 
{
...
}

---

这是因为在每个子节点之间有2个

TEXT\u节点

（

#TEXT

）

以下内容包括文本节点及其相应的值

<object flag="complete" id="objId" version="1">
    <TEXT_NODE />
    <variable_value variable_id="varId">ValueGoesHere</variable_value>
    <reference item_ref="2"/>
    <TEXT_NODE />
</object>

其中，3=

TEXT\u节点

和1=

ELEMENT\u节点

 if (aNode.getNodeType() == Node.ELEMENT_NODE) 
{
...
}

<object flag="complete" id="objId" version="1">
    <TEXT_NODE />
    <variable_value variable_id="varId">ValueGoesHere</variable_value>
    <reference item_ref="2"/>
    <TEXT_NODE />
</object>

DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
        Document dom = dBuilder.parse(new ByteArrayInputStream(S.getBytes()));
        NodeList collected_objects = dom.getElementsByTagName("object");
        System.out.println("Number of collected objects are "
                + collected_objects.getLength());

        for (int i = 0; i < collected_objects.getLength(); i++) {

            Node aNode = collected_objects.item(i);
            // get children of "objects"
            NodeList refNodes = aNode.getChildNodes();

            System.out.println("# of chidren are " + refNodes.getLength());

            //
            for (int x = 0; x < refNodes.getLength(); x++) {
                Node n = refNodes.item(x);
                System.out.println(n.getNodeType() + " = " + n.getNodeName() + "/" + n.getNodeValue());
            }

            // print attributes of "objects"

            NamedNodeMap attributes = aNode.getAttributes();
            for (int a = 0; a < attributes.getLength(); a++) {
                Node theAttribute = attributes.item(a);
                System.out.println(theAttribute.getNodeName() + "="
                        + theAttribute.getNodeValue());

            }

        }

Number of collected objects are 2
# of chidren are 5
3 = #text/          
1 = variable_value/null
3 = #text/          
1 = reference/null
3 = #text/        
flag=complete
id=objId
version=1
# of chidren are 3
3 = #text/          
1 = reference/null
3 = #text/        
comment=objComment
flag=complete
id=objId
version=1