//创建Document 对象，代表整个 xml文档
Document document = DocumentHelper.createDocument();

//创建根节点
Element school = document.addElement("school");

//创建子节点
Element student = school.addElement("student");
//子节点的属性
student.addAttribute("id", "1");

//创建 student下的子节点
Element name = student.addElement("name");
//添加内容
name.setText("张三");

//自动格式化xml 文件
OutputFormat format = OutputFormat.createPrettyPrint();

//创建 XML 文件
File file =new File("DOM4JXML.xml");XMLWriter writer = new XMLWriter(new FileOutputStream(file),format);
//特殊字符，是否转义，默认为true
writer.setEscapeText(false);
writer.write(document);
writer.close();

<?xml version="1.0" encoding="UTF-8"?><school><student id="1"><name>张三</name></student>
</scho

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;public class createDOM4JTest {public static void main(String[] args) {//创建Document 对象，代表整个 xml文档Document document = DocumentHelper.createDocument();//创建根节点Element school = document.addElement("school");//创建子节点Element student = school.addElement("student"); //子节点的属性student.addAttribute("id", "1");//创建 student下的子节点Element name = student.addElement("name");//添加内容name.setText("张三");//自动格式化xml 文件OutputFormat format = OutputFormat.createPrettyPrint();//创建 XML 文件File file =new File("DOM4JXML.xml");//XMLWriter writer;try {XMLWriter writer = new XMLWriter(new FileOutputStream(file),format);//特殊字符，是否转义，默认为truewriter.setEscapeText(false);writer.write(document);writer.close();} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} }
}