java 如何读取特定元素的 XML 子节点值？
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How to read XML child node values of specific element?
提问by user1652549
I am trying to read child node value with attribute value of a specific element using DOM parser.. My xml file:
我正在尝试使用 DOM 解析器读取具有特定元素的属性值的子节点值。我的 xml 文件：
<?xml version="1.0" encoding="UTF-8"?>
<RootNode>
<SubNode Sid="1">
<title>some text</title>
<data dId="1">some text</data>
<data dId="2">some text</data>
<ExData>1</ExData>
</SubNode>
<SubNode Sid="2">
<title>some text</title>
<data dId="1">some text</data>
<data dId="2">some text</data>
<data dId="3">some text</data>
<data dId="4">some text</data>
<data dId="5">some text</data>
<ExData>1</ExData>
</SubNode>
<SubNode Sid="3">
<title>some text</title>
<data dId="1">some text</data>
<data dId="2">some text</data>
<data dId="3">some text</data>
<ExData>1</ExData>
</SubNode>
</RootNode>
i am trying to read datanodes value of a one SubNode. i have checked with below code:
我正在尝试读取一个data节点的值SubNode。我已经检查了以下代码：
private void parseDocument()
{
Element docEle = dom.getDocumentElement();
NodeList nl = docEle.getElementsByTagName("SubNode");
if(nl!= null && nl.getLength()>0)
{
for(int i=0; i<nl.getLength();i++)
{
Element el = (Element)nl.item(i);
InfoBean que = getInfoBean(el);
InfoBeanSet.add(que);
}
}
}
private InfoBean getInfoBean(Element el)
{
int sId = Integer.parseInt(el.getAttribute("Sid"));
String title = getTextValue(el,"title");
NodeList SingleOptionNode = el.getElementsByTagName("data");
int nodeLen = SingleOptionNode.getLength();
if(SingleOptionNode != null && nodeLen>0)
{
for(int i=0; i<nodeLen; i++)
{
Element el1 = (Element)SingleOptionNode.item(i);
NodeList nextOption = el1.getChildNodes();
Node currentNode = (Node) nextOption.item(0);
int dId = Integer.parseInt(el1.getAttribute("dId"));
String data = currentNode.getNodeValue();
opt.add(new Option(data, dId));
}
}
String ExData = getTextValue(el,"ExData");
InfoBean ifb = new InfoBean(sId,title,opt,ExData);
return ifb;
}
it gives data node values of all 3 SubNodes. how to read one SubNode element child node values with attribute value. Can i know the reason why am getting all data node value? can i get some code examples how to read data node value of a one SubNode element.. Any help would appreciated.
它给出了所有 3 个子节点的数据节点值。如何使用属性值读取一个 SubNode 元素的子节点值。我能知道获取所有数据节点值的原因吗？我可以得到一些代码示例如何读取一个子节点元素的数据节点值.. 任何帮助将不胜感激。
回答by Paul Butcher
This line introduces a loop over all of the SubNode elements in your node list.
此行在节点列表中的所有 SubNode 元素上引入了一个循环。
for(int i=0; i<nl.getLength();i++)
Try not doing that.
尽量不要那样做。
