java DOM XML Parser Inner Element

Question

我能够通过使用XML DOM解析器解析xml的主要元素，例如我可以获取getElementsByTagName("id")或getElementsByTagName("stock_number")，等等，但是我遇到了一个问题，因为在标签中我需要能够仅返回的信息。

我在文件提要中有一个 XML.xml如下所示：

<inventory>
<item UnitID="1234" Record="0">
<id>1234</id>
<dealerid>455</dealerid>
<stock_number>1600Xtreme</stock_number>
<make>Nvidia</make>
<noteshtml>This is some random info about the product1234.<br><br> 
Buy with trust from a LQZ dealership.<br><br> Contact&nbsp;Dave at 
Burnaby location - 604 123 4578.<br>
</noteshtml>
<images>
<Image1 image="1" UnitID="1234">
https://anydomain.com/photo54.jpg
</Image1>
<Image2 image="2" UnitID="1234">
https://anydomain.com/photo22.jpg
</Image2>
<Image3 image="3" UnitID="1234">
https://anydomain.com/photo32.jpg
</Image3>
</images>
</item>
<item UnitID="7854" Record="1">
<id>7854</id>
<dealerid>587</dealerid>
<stock_number>12TMAX5500</stock_number>
<make>Realtek</make>
<noteshtml>This is some random info about the product 7854.<br><br> 
Buy with trust from a LQZ dealership.<br><br> Contact&nbsp;Dave at 
Burnaby location - 604 123 4578.<br>
</noteshtml>
<images>
<Image1 image="1" UnitID="7854">
https://anydomain.com/photo656.jpg
</Image1>
<Image2 image="2" UnitID="7854">
https://anydomain.com/photo6565.jpg
</Image2>
<Image3 image="3" UnitID="7854">
https://anydomain.com/photo908.jpg
</Image3>
</images>
</item>
</inventory>

这通常是我到目前为止得到的 Java 代码：

File fXmlFile=new File("feed.xml");
DocumentBuilderFactory dbFactory=DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder=dbFactory.newDocumentBuilder();
Document doc=dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
NodeList nList=doc.getElementsByTagName("item");
for (int temp=0; temp < nList.getLength(); temp++)
{
Node nNode=nList.item(temp);
Element eElement2=(Element)nNode;
int search=1234;
System.out.println("This is the value to search from my variable: " + search);
int toTest=Integer.parseInt(eElement2.getAttribute("UnitID"));
System.out.println("toTest is equal to: " + toTest);
if (toTest == search)
{
System.out.println("stock Number: " + eElement2.getElementsByTagName("stock_number").item(0).getTextContent());
}
}

我的问题是如何现在进入图像标签并仅打印该 image=1 标识符的 url。

我已经搜索了很多并研究了如何使用 DOM 解析器，我尝试通过创建节点的子元素来尝试，但我收到错误。 感谢您的回答。

Answer 1

要在 images标签中获取 child，不能直接调用 getChildNode 中的 images 标签，因为还有一些额外的节点，请参考 java xml cast Node to Element。 因此，请尝试通过getElementsByTagName直接获取孩子。

File fXmlFile=new File("feed.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
NodeList nList = doc.getElementsByTagName("item");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
Element eElement2 = (Element) nNode;
int search = 1234;
System.out.println("This is the value to search from my variable: " + search);
int toTest = Integer.parseInt(eElement2.getAttribute("UnitID"));
System.out.println("toTest is equal to: " + toTest);
if (toTest == search) {
System.out.println(
"stock Number: " + eElement2.getElementsByTagName("stock_number").item(0).getTextContent());
Element images = (Element) eElement2.getElementsByTagName("images").item(0);
Element image1Node = (Element) images.getElementsByTagName("Image1").item(0);
Element image2Node = (Element) images.getElementsByTagName("Image2").item(0);
Element image3Node = (Element) images.getElementsByTagName("Image3").item(0);
if (image1Node.getAttribute("image").equals("1")) {
System.out.println("image1Node id attribute is 1");
}
if (image2Node.getAttribute("image").equals("1")) {
System.out.println("image2Node id attribute is 1");
}
if (image3Node.getAttribute("image").equals("1")) {
System.out.println("image3Node id attribute is 1");
}
}
}