[记录]Android操作XML - w3c

languages.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<languages cat="it">
    <lan id="1">
        <name>Java</name>
        <ide>Eclipse</ide>
    </lan>
    <lan id="2">
        <name>Swift</name>
        <ide>Xcode</ide>
    </lan>
    <lan id="3">
        <name>C#</name>
        <ide>Visual Studio</ide>
    </lan>
</languages>

 

解析xml关键代码

　　　　txt = (TextView) findViewById(R.id.txt);
        try {
            //创建一个DocumentBuilderFactory实例
            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
            //创建一个DocumentBuilder对象
            DocumentBuilder builder =  builderFactory.newDocumentBuilder();
            //创建一个Document,对应一个xml文件
            Document document = builder.parse(getAssets().open("languages.xml"));
            //获取Document的所有元素
            Element element = document.getDocumentElement();
            //获取标签为lan的所有元素,返回NodeList
            NodeList list = element.getElementsByTagName("lan");
            //遍历NodeList
            for (int i = 0; i < list.getLength(); i++) {
                //获取当前循环到的一项
                Element lan = (Element) list.item(i);
                //获取当前元素中属性名为id的值
                txt.append("\n"+lan.getAttribute("id")+"\n");
                txt.append(lan.getElementsByTagName("name").item(0).getTextContent()+"\n");
                txt.append(lan.getElementsByTagName("ide").item(0).getTextContent()+"\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        }

 生成XML关键代码：

txt = (TextView) findViewById(R.id.txt);

try {
            //创建一个DocumentBuilderFactory实例
            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
            //创建一个DocumentBuilder对象
            DocumentBuilder builder = builderFactory.newDocumentBuilder();
            //创建一个新的document
            Document docment = builder.newDocument();
            //创建一个根元素，名为languages
            Element languages = docment.createElement("languages");
            //为languages元素添加cat属性,值为it
            languages.setAttribute("cat", "it");
            
            String[] names={"Java","Swift","C#"};
            String[] ides={"Eclipse","Xcode","Visual Studio"};
            //循环创建子元素
            for (int i = 0; i < 3; i++) {
                //创建一个元素,名为lan
                Element lan = docment.createElement("lan");
                //为lan元素添加id属性,值为当前循环的索引+1
                lan.setAttribute("id",(i+1)+"");
                //为上面添加的lan元素添加子元素
                Element name = docment.createElement("name");
                name.setTextContent(names[i]);
                Element ide = docment.createElement("ide");
                name.setTextContent(ides[i]);
                //将上面创建的两个元素添加到lan元素中
                lan.appendChild(name);
                lan.appendChild(ide);
                //将lan元素添加到languages元素中
                languages.appendChild(lan);
                
            }
            //将languages元素添加到docment中
            docment.appendChild(languages);
            //创建一个TransformerFactory实例
            TransformerFactory factory = TransformerFactory.newInstance();
            //创建一个Transformer对象
            Transformer former = factory.newTransformer();
            //设置former的属性
            former.setOutputProperty("encoding", "utf-8");
            StringWriter writer = new StringWriter();
            former.transform(new DOMSource(docment), new StreamResult(writer));
            txt.append(writer.toString());
            
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (TransformerConfigurationException e) {
            e.printStackTrace();
        } catch (TransformerException e) {
            e.printStackTrace();
        }