代碼如下：

 1 package xml; 2  3 import java.io.FileWriter; 4 import java.io.IOException; 5 import java.io.Writer; 6 import org.dom4j.Document; 7 import org.dom4j.DocumentHelper; 8 import org.dom4j.Element; 9 import org.dom4j.io.OutputFormat;10 import org.dom4j.io.XMLWriter;11 12 public class Dom4jCreateXML{13     public void testCreateXml() {14         //創建一個xml文檔15         Document doc = DocumentHelper.createDocument();16         //向xml文件中添加注釋17         doc.addComment("這里是注釋");18         //創建一個名為students的節點，因為是第一個創建，所以是根節點,再通過doc創建一個則會報錯。19         Element root = doc.addElement("students");20         //在root節點下創建一個名為student的節點21         Element stuEle = root.addElement("student");22         //給student節點添加屬性23         stuEle.addAttribute("id", "101");24         //給student節點添加一個子節點25         Element nameEle = stuEle.addElement("name");26         //設置子節點的文本27         nameEle.setText("張三");28         //用于格式化xml內容和設置頭部標簽29         OutputFormat format = OutputFormat.createPRettyPrint();30         //設置xml文檔的編碼為utf-831         format.setEncoding("utf-8");32         Writer out;33         try {34             //創建一個輸出流對象35             out = new FileWriter("E://xml//new.xml");36             //創建一個dom4j創建xml的對象37             XMLWriter writer = new XMLWriter(out, format);38             //調用write方法將doc文檔寫到指定路徑39             writer.write(doc);40             writer.close();41             System.out.print("生成XML文件成功");42         } catch (IOException e) {43             System.out.print("生成XML文件失敗");44             e.printStackTrace();45         }46     }47     48     public static void main(String[] args){49         Dom4jCreateXML xml = new Dom4jCreateXML();50         xml.testCreateXml();51     }52 }

生成的XML文件：

1 <?xml version="1.0" encoding="utf-8"?>2 3 <!--這里是注釋-->4 <students>5   <student id="101">6     <name>張三</name>7   </student>8 </students>