Android中写入读取XML

获取XML文件的基本思路是，通过getResources().getXml()获的XML原始文件，得到XmlResourceParser对象，通过该对象来判断是文档的开头还是结尾，是某个标签的开始还是结尾，并通过一些获取属性的方法来遍历XML文件，从而访问XML文件的内容，下面是一个访问XML文件内容的例子，并将内容更显示在一个TextView上

数据写入xml:

ReadXMLTest.java

//xml数据生成
    private String WriteToString() {
        XmlSerializer serializer = Xml.newSerializer();
        StringWriter writer = new StringWriter();
        try {
            serializer.setOutput(writer);
            serializer.startDocument("utf-8", true);
            serializer.startTag("", "users");

            serializer.startTag("", "userName");
            serializer.text(txtUser.getText().toString());
            serializer.endTag("", "userName");

            serializer.startTag("", "userEmail");
            serializer.text(txtEmail.getText().toString());
            serializer.endTag("", "userEmail");

            serializer.startTag("", "passWord");
            serializer.text(txtPass.getText().toString());
            serializer.endTag("", "passWord");

            serializer.endTag("", "users");
            serializer.endDocument();

        } catch (IllegalArgumentException e) {
            // TODO: handle exception
            e.printStackTrace();
        } catch (IllegalStateException e) {
            // TODO: handle exception
            e.printStackTrace();
        } catch (IOException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return writer.toString();
    }

    //将字符串保存为apk的私有文件
    private boolean writeToXml(String str) {
        try {

            OutputStream out = openFileOutput("users.xml",MODE_PRIVATE);
            OutputStreamWriter outWriter = new OutputStreamWriter(out);
            try {
                outWriter.write(str);
                outWriter.close();
                out.close();
                return true;
            } catch (IOException e) {
                // TODO: handle exception
                return false;
            }
        } catch (Exception e) {
            // TODO: handle exception
            return false;
        }
    }

调用时:

if(writeToXml(WriteToString()))

{

      //成功

}

数据读取 xml:

//tag ,存入的节点名

private String ReadXmlUser(String tag)
    {
        String re="";
        DocumentBuilderFactory documentBuilderFactory;
        DocumentBuilder documentBuilder;
        Document document;
        try {
            documentBuilderFactory=DocumentBuilderFactory.newInstance();
            documentBuilder=documentBuilderFactory.newDocumentBuilder();
            //xml文件放到assets目录下
            document=documentBuilder.parse(this.openFileInput("users.xml"));
            org.w3c.dom.Element root= document.getDocumentElement();
            NodeList nodeList=root.getElementsByTagName(tag);
            Node nd=nodeList.item(0);
            re= nd.getFirstChild().getNodeValue();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }finally{
            document=null;
            documentBuilder=null;
            documentBuilderFactory=null;
        }
        return re;
    }