使用JDom来创建XML文档实例，需要引入jdom.jar包

import java.io.FileOutputStream;
import java.io.IOException;
import org.jdom.Attribute;
import org.jdom.Comment;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;




/**
 * 使用JDom来创建XML文档
 * @author jiangqq
 *
 */
public class JDomTest01 {
  public static void main(String[] args) throws Exception, IOException {
  
Document  document=new Document();

Element root=new Element("root");

document.addContent(root);

Comment comment=new Comment("This is the comment");

root.addContent(comment);

Element e = new Element("hello");

e.setAttribute("sohu","www.sohu.com");

root.addContent(e);

Element e2=new Element("world");

Attribute attr=new Attribute("test","haha");

e2.setAttribute(attr);

e.addContent(e2);

e2.addContent(new Element("aaa")
.setAttribute("a","b").setAttribute("b","b").setAttribute("c","c")
.setText("aaa"));

Format format=Format.getPrettyFormat();

format.setIndent("    ");
format.setEncoding("UTF-8");

XMLOutputter out=new XMLOutputter(format);

out.output(document, new FileOutputStream("jdom.xml"));
 }

}

生成的XML文档如下：

     <?xml version="1.0" encoding="UTF-8"?>
<root>
    <!--This is the comment-->
    <hello sohu="www.sohu.com">
        <world test="haha">
            <aaa a="b" b="b" c="c">aaa</aaa>
        </world>
    </hello>
</root>