8001511072夏先国实验七：第八章：Android数据存储主要技术（上）

android:text=\李兴华\ />

android:layout_width=\ android:layout_height=\ android:textSize=\ android:text=\邮箱：\ /> android:id=\

android:layout_width=\ android:layout_height=\ android:text=\ />

android:id=\

android:layout_width=\ android:layout_height=\ android:text=\保存\ />

MyDOMDemo.java文件代码： package org.lxh.demo;

import java.io.File;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerConfigurationException; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import android.app.Activity; import android.os.Bundle;

import android.os.Environment; import android.view.View;

import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText;

public class MyDOMDemo extends Activity { private EditText name = null ; private EditText email = null ; private Button but = null ; @Override

public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); super.setContentView(R.layout.main);

this.name = (EditText) super.findViewById(R.id.name) ; this.email = (EditText) super.findViewById(R.id.email) ; this.but = (Button) super.findViewById(R.id.but) ;

this.but.setOnClickListener(new OnClickListenerImpl()) ; }

private class OnClickListenerImpl implements OnClickListener{

@Override

public void onClick(View v) {

if (!Environment.getExternalStorageState().equals(

Environment.MEDIA_MOUNTED)) { // 不存在不操作

return; // 返回到程序的被调用处 }

File file = new File(Environment.getExternalStorageDirectory() + File.separator + \ + \要输出文件的路径

if (!file.getParentFile().exists()) { // 父路径不存在

file.getParentFile().mkdirs() ; // 创建父文件夹 }

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance() ; DocumentBuilder builder = null ; try {

builder = factory.newDocumentBuilder() ; } catch (ParserConfigurationException e) { e.printStackTrace(); }

Document doc = null ;

doc = builder.newDocument() ; // 创建一个新的文档 Element addresslist = doc.createElement(\ Element linkman = doc.createElement(\ Element name = doc.createElement(\ Element email = doc.createElement(\

name.appendChild(doc.createTextNode(MyDOMDemo.this.name.getText()

.toString()));

email.appendChild(doc.createTextNode(MyDOMDemo.this.email.getText()

.toString()));

linkman.appendChild(name) ; linkman.appendChild(email) ;

addresslist.appendChild(linkman) ; doc.appendChild(addresslist) ;

TransformerFactory tf = TransformerFactory.newInstance() ; Transformer t = null ; try {

t = tf.newTransformer() ;

} catch (TransformerConfigurationException e) { e.printStackTrace();

}

t.setOutputProperty(OutputKeys.ENCODING, \ DOMSource source = new DOMSource(doc); StreamResult result = new StreamResult(file) ; try {

t.transform(source, result) ; } catch (TransformerException e) { e.printStackTrace(); } } } }

实验效果截图：

iii）XMLPullProject（XMLPull读取）

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