DOM4J是JDOM项目的部分人员开发的另一个XML解析框架,与JDOM差不多。
创建XML文档并在命令行输出,同时输出为文件:
- import java.io.FileOutputStream;
- import java.io.FileWriter;
- import java.io.IOException;
- import org.dom4j.Document;
- import org.dom4j.DocumentHelper;
- import org.dom4j.Element;
- import org.dom4j.io.OutputFormat;
- import org.dom4j.io.XMLWriter;
- public class Test1
- {
- public static void main(String[] args) throws Exception
- {
- //创建文档并设置文档的根元素节点:第一种方式
- // Document document = DocumentHelper.createDocument();
- //
- // Element root = DocumentHelper.createElement("student");
- //
- // document.setRootElement(root);
- //创建文档并设置文档的根元素节点:第二种方式
- Element root = DocumentHelper.createElement("student");
- Document document = DocumentHelper.createDocument(root);
- root.addAttribute("name", "zhangsan");
- Element helloElement = root.addElement("hello");
- Element worldElement = root.addElement("world");
- helloElement.setText("hello");
- worldElement.setText("world");
- helloElement.addAttribute("test", "haha");
- XMLWriter xmlWriter = new XMLWriter();
- xmlWriter.write(document);
- OutputFormat format = new OutputFormat(" ",true);
- XMLWriter xmlWriter2 = new XMLWriter(new FileOutputStream("student2.xml"),format);
- xmlWriter2.write(document);
- XMLWriter xmlWriter3 = new XMLWriter(new FileWriter("student3.xml"),format);
- xmlWriter3.write(document);
- xmlWriter3.flush();
- //
- }
- }
对一个已有xml进行解析
- import java.io.File;
- import java.util.Iterator;
- import java.util.List;
- import javax.xml.parsers.DocumentBuilder;
- import javax.xml.parsers.DocumentBuilderFactory;
- import javax.xml.parsers.ParserConfigurationException;
- import org.dom4j.Document;
- import org.dom4j.DocumentException;
- import org.dom4j.Element;
- import org.dom4j.io.DOMReader;
- import org.dom4j.io.SAXReader;
- public class Test2
- {
- public static void main(String[] args) throws Exception
- {
- SAXReader saxReader = new SAXReader();
- Document doc = saxReader.read(new File("student2.xml"));
- Element root = doc.getRootElement();
- System.out.println("root element:" + root.getName());
- List childList = root.elements();
- System.out.println(childList.size());
- List childList2 = root.elements("hello");
- System.out.println(childList2.size());
- Element first = root.element("hello");
- System.out.println(first.attributeValue("test"));
- for(Iterator iter = root.elementIterator();iter.hasNext();)
- {
- Element e = (Element)iter.next();
- System.out.println(e.attributeValue("test"));
- }
- System.out.println("---------------------");
- DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
- DocumentBuilder db = dbf.newDocumentBuilder();
- org.w3c.dom.Document document = db.parse(new File("student2.xml"));
- DOMReader domReader = new DOMReader();
- //将JAXP的Document转换为dom4j的Document
- Document d = domReader.read(document);
- Element rootElement = d.getRootElement();
- System.out.println(rootElement.getName());
- }
- }
DOMReader的read方法可以将JAXP的Document转换为dom4j的Document,然后使用dom4j的方法来进行解析。
如果你的myeclipse的工作空间文本文件的编码方式为默认(默认为GBK),使用JDOM或dom4j的输出方法默认输出的xml文件编码是utf-8,如果xml中有汉字,则将出现乱码现象,好的作法是将工作空间的编码格式改为utf-8。