Android dom parses xml method

First create an xml file yourself: DomTest.xml

<?xml version="1.0" encoding="utf-8"?>
<classes>
	<group name="一年级" num="10">
		<person name="小明" age="7">
			<chinese>
				语文80
			</chinese>
			<english>
				英语89
			</english>
		</person>
		<person name="小强" age="8">
			<chinese>
				语文90
			</chinese>
			<english>
				英语99
			</english>
		</person>
	</group>
	<group name="二年级" num="20">
		<person name="小文" age="8">
			<chinese>
				语文85
			</chinese>
			<english>
				英语95
			</english>
		</person>
		<person name="小中" age="9">
			<chinese>
				语文80
			</chinese>
			<english>
				英语90
			</english>
		</person>
	</group>
</classes>

The parsed result is shown as follows:

Let’s analyze the source code:

/**
 * 用dom方式 解析xml 文件
 * @param fileName
 */
	private String domXmlParse(String fileName) {
		String str="";
		// xml文档创建工厂
		DocumentBuilderFactory docFactory = DocumentBuilderFactory
				.newInstance();
		// xml文档创建实例
		DocumentBuilder docBuilder;
		// xml文档
		Document doc = null;
		InputStream inStream = null;
		try {
			docBuilder = docFactory.newDocumentBuilder();
			// 从assets文件夹下获取文件 转换成输入流
			inStream = this.getResources().getAssets().open(fileName);
			doc = docBuilder.parse(inStream);
			// 获取xml跟元素
			Element rootEle = doc.getDocumentElement();
			// 二级父元素的list列表
			NodeList groupNode = rootEle.getElementsByTagName("group");
			// NodeList childNode = rootEle.getElementsByTagName("person");
			// 遍历Classe下所有的group
			for (int i = 0; i < groupNode.getLength(); i++) {

				Element groupEle = (Element) groupNode.item(i);
				String groupName = groupEle.getAttribute("name");
				String num = groupEle.getAttribute("num");
				str =str+"name ="+groupName+" num = "+num+"\n";
				
				Log.e("xml", "name = " + groupName + "  num = " + num);

//				NodeList personNode = groupNode.item(i).getChildNodes();
				NodeList personNode = groupEle.getElementsByTagName("person");
				// 遍历group下的所有person
				for (int j = 0; j < personNode.getLength(); j++) {
					Element personEle = (Element) personNode.item(j);
					String name = personEle.getAttribute("name");
					String age = personEle.getAttribute("age");
					str =str+"personName ="+name+" personAge = "+age+"\n";
					
					Log.e("xml", "name = " + name + "   age = " + age);

					Element chineseEle = (Element) personEle
							.getElementsByTagName("chinese").item(0);
					Element englistEle = (Element) personEle
							.getElementsByTagName("english").item(0);
					String chinese = chineseEle.getFirstChild().getNodeValue();
					String english = englistEle.getFirstChild().getNodeValue();
					str =str+"chinese = "+chinese+" english = "+english+"\n";
					
					Log.e("xml", "chinese = " + chinese + "   english = "
							+ english);
				}
			}

		} catch (ParserConfigurationException e1) {
			e1.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		}
		return str;
	}

Defines a set of interfaces for the parsed version of an XML document. The parser reads in the entire document and builds a memory-resident tree structure that code can then manipulate using the DOM interface. Advantages: The entire document tree is in memory, easy to operate; supports multiple functions such as deletion, modification, and rearrangement; Disadvantages: Transferring the entire document into memory (including useless nodes) wastes time and space; Usage occasions: Once parsed Documents also need to access this data multiple times; hardware resources are sufficient (memory, CPU).

The above is the content of the android dom parsing xml method. For more related content, please pay attention to the PHP Chinese website (m.sbmmt.com)!