안드로이드 돔 방식으로 XML 생성

<?xml version="1.0" encoding="utf-8"?>  
<classes>  
    <group name="一年级" num="10">  
        <person name="小明" age="7">  
            <chinese>语文90</chinese>  
            <english>英语80</english>  
        </person>  
    </group>  
</classes>

// 从assets文件夹下获取文件 转换成输入流  
//          inStream = this.getResources().getAssets().open(fileName);  
//          doc = docBuilder.parse(inStream);  
            InputStream fosStream = openFileInput(fileName);  
            doc = docBuilder.parse(fosStream);

String[] fileNames = getFilesDir().list();

String fileName = fileNames[0];

private void createXmlFile(){  
          
        try {  
            DocumentBuilderFactory factory = DocumentBuilderFactory  
                    .newInstance();  
            DocumentBuilder builder = factory.newDocumentBuilder();  
            Document doc  = builder.newDocument();  
            //创建xml根元素  
            Element rootEle = doc.createElement("classes");  
            doc.appendChild(rootEle);  
            //创建xml二级元素  
            Element groupEle = doc.createElement("group");  
            groupEle.setAttribute("name", "一年级");  
            groupEle.setAttribute("num", "10");  
            //创建xml person元素  
            Element personEle = doc.createElement("person");  
            //personEle 的属性和属性值  
            personEle.setAttribute("name", "小明");  
            personEle.setAttribute("age", "7");  
            //创建personELe的子元素  
            Element chinese = doc.createElement("chinese");  
            //创建personELe的子元素的值  
            chinese.appendChild(doc.createTextNode("语文90"));  
            personEle.appendChild(chinese);  
            Element english = doc.createElement("english");  
            english.appendChild(doc.createTextNode("英语80"));  
            personEle.appendChild(english);  
              
            groupEle.appendChild(personEle);  
            rootEle.appendChild(groupEle);  
              
            TransformerFactory tf = TransformerFactory.newInstance();  
            Transformer transformer = tf.newTransformer();  
              
            DOMSource source = new DOMSource(doc);  
            transformer.setOutputProperty(OutputKeys.ENCODING, "utf-8");  
            transformer.setOutputProperty(OutputKeys.INDENT, "no");  
            //创建文件存放在 /data/data/cn.xxx.xxx(当前包)/files   
            FileOutputStream fos = openFileOutput("Dom.xml", Context.MODE_PRIVATE);  
            //创建文件存放在 /data/data/cn.xxx.xxx(当前包)/cache  
//          FileOutputStream fos = Op  
            PrintWriter pw = new PrintWriter(fos);  
            StreamResult result = new StreamResult(pw);  
            transformer.transform(source, result);  
              
            System.out.println("生成XML文件成功!");  
        } catch (ParserConfigurationException e) {  
            System.out.println(e.getMessage());  
        } catch (TransformerConfigurationException e) {  
            System.out.println(e.getMessage());  
        } catch (TransformerException e) {  
            System.out.println(e.getMessage());  
        } catch (FileNotFoundException e) {  
            System.out.println(e.getMessage());  
        }  
          
    }