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  首先下载jdom的压缩文件:http://www.jdom.org/dist/binary/，解压后在build文件下找到jdom.jar添加到你的工程里。

//添加根节点animal
Element root = new Element("animal");
Document myDocument = new Document(root);

//为根节点添加子节点dog
Element dog = new Element("dog");
  root.addContent(dog);

//为dog节点添加相应的属性节点
dog.addContent(new Element("name").addContent("小次郎"));
  dog.addContent(new Element("sex").addContent("male"));
  dog.addContent(new Element("age").addContent("3"));
  dog.addContent(new Element("color").addContent("黑白"));

//设置输出的格式及编码
org.jdom.output.Format format = org.jdom.output.Format.getCompactFormat();
   format.setEncoding("UTF-8");
   format.setIndent("  "); //缩进2个空格后换行,空格数自己设

//输出xml
try {
   XMLOutputter outputter = new XMLOutputter(format);
      outputter.output(myDocument, new FileOutputStream("d:\\1.xml"));
  } catch (Exception e) {
      e.printStackTrace();
  }

//生成的xml文件内容如下:
<?xml version="1.0" encoding="UTF-8"?>
<animal>
  <dog>
    <name>小次郎</name>
    <sex>male</sex>
    <age>3</age>
    <color>黑白</color>
  </dog>
</animal>