DOM
DOM 是最容易使用的java XML解析器。它可以解析一个完整的XML文档并将其加载到内存中，然后用对象对其进行建模，以实现简单的node遍历。DMO是将XML直接加载到内存中进行处理的，所以不建议解析较大的XML文件。
读取XML文件
目标文件xmlDemo.xml
代码语言：javascript复制<?xml version="1.0" encoding="UTF-8"?>
<note auth="Byron.y.y">
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>java代码使用dom4j解析XML文件
代码语言：javascript复制package byron4j.xml;
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class DomDemo1 {
public static void main(String[] args) throws Exception{
String classPath = DomDemo1.class.getClass()
.getResource("/").getPath();
File file = new File(classPath);
String fth = file.getParent();
File fFile = new File(fth);
String xmlPath = fFile.getParent() "\src\xmlDemo.xml";
File fXmlFile = new File(xmlPath);
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
System.out.println("Root element :" doc.getDocumentElement().getNodeName());
NodeList nList = doc.getElementsByTagName("note");
System.out.println("----------------------------");
for (int temp = 0; temp < nList.getLength(); temp ) {
Node nNode = nList.item(temp);
System.out.println("nCurrent Element :" nNode.getNodeName());
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
System.out.println("author==> : " eElement.getAttribute("auth"));
System.out.println("1==> : " eElement.getElementsByTagName("to").item(0).getTextContent());
System.out.println("2==> : " eElement.getElementsByTagName("from").item(0).getTextContent());
System.out.println("3==> : " eElement.getElementsByTagName("heading").item(0).getTextContent());
System.out.println("4==> : " eElement.getElementsByTagName("body").item(0).getTextContent());
}
}
}
}运行结果：
代码语言：javascript复制Root element :note
----------------------------
Current Element :note
author==> : Byron.y.y
1==> : Tove
2==> : Jani
3==> : Reminder
4==> : Don't forget me this weekend!
