Android 创建与解析XML（二）—— Dom方式(源码)

package yy.android.xml;

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

public class YXMLActivity extends Activity {

private TextView tvXMLCreate;
private TextView tvXMLResolve;

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

tvXMLCreate = (TextView)findViewById(R.id.tvXMLCreate);
tvXMLResolve = (TextView)findViewById(R.id.tvXMLResolve);

String xml = "";
XMLDom xmlDom = new XMLDom(this);
xml = xmlDom.XMLCreate();
tvXMLCreate.setText(xml);

xml = xmlDom.XMLResolve();
tvXMLResolve.setText(xml);
}

}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package yy.android.xml;

public class Person {
private int id;
private String name;
private String blog;

public Person() {
this.id = -1;
this.name = "";
this.blog = "";
}

public Person(int id, String name, String blog) {
this.id = id;
this.name = name;
this.blog = blog;
}

public Person(Person person) {
this.id = person.id;
this.name = person.name;
this.blog = person.blog;
}

public Person getPerson(){
return this;
}

public void setId(int id) {
this.id = id;
}

public int getId(){
return this.id;
}

public void setName(String name) {
this.name = name;
}

public String getName() {
return this.name;
}

public void setBlog(String blog) {
this.blog = blog;
}

public String getBlog() {
return this.blog;
}

public String toString() {
return "Person \nid = " + id + "\nname = " + name + "\nblog = " + blog + "\n";
}
}
/////////////////////////////////////////////////////////////////////////////////////////////

package yy.android.xml;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringWriter;
import java.util.Properties;

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.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import android.content.Context;

public class XMLDom {

private final String fileName = "myDomXML.xml";
private Context mContext = null;

public XMLDom(Context context){
this.mContext = context;
}

/** Dom方式，创建 XML */
public String XMLCreate() {
String xmlWriter = null;

Person []persons = new Person[3]; // 创建节点Person对象
persons[0] = new Person(1, "sunboy_2050", "http://blog.csdn.net/sunboy_2050");
persons[1] = new Person(2, "baidu", "http://www.baidu.com");
persons[2] = new Person(3, "google", "http://www.google.com");

try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.newDocument();

Element eleRoot = doc.createElement("root");
eleRoot.setAttribute("author", "homer");
eleRoot.setAttribute("date", "2012-04-26");
doc.appendChild(eleRoot);

int personsLen = persons.length;
for(int i=0; i<personsLen; i++) {
Element elePerson = doc.createElement("person");
eleRoot.appendChild(elePerson);

Element eleId = doc.createElement("id");
Node nodeId = doc.createTextNode(persons[i].getId() + "");
eleId.appendChild(nodeId);
elePerson.appendChild(eleId);

Element eleName = doc.createElement("name");
Node nodeName = doc.createTextNode(persons[i].getName());
eleName.appendChild(nodeName);
elePerson.appendChild(eleName);

Element eleBlog = doc.createElement("blog");
Node nodeBlog = doc.createTextNode(persons[i].getBlog());
eleBlog.appendChild(nodeBlog);
elePerson.appendChild(eleBlog);
}

//设置XML属性
Properties properties = new Properties();
properties.setProperty(OutputKeys.INDENT, "yes");
properties.setProperty(OutputKeys.MEDIA_TYPE, "xml");
properties.setProperty(OutputKeys.VERSION, "1.0");
properties.setProperty(OutputKeys.ENCODING, "utf-8");
properties.setProperty(OutputKeys.METHOD, "xml");
properties.setProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");

TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperties(properties);

DOMSource domSource = new DOMSource(doc.getDocumentElement());
OutputStream output = new ByteArrayOutputStream();
StreamResult result = new StreamResult(output);
transformer.transform(domSource, result);

xmlWriter = output.toString();

} catch (ParserConfigurationException e) { // factory.newDocumentBuilder
e.printStackTrace();
} catch (DOMException e) { // doc.createElement
e.printStackTrace();
} catch (TransformerFactoryConfigurationError e) { // TransformerFactory.newInstance
e.printStackTrace();
} catch (TransformerConfigurationException e) { // transformerFactory.newTransformer
e.printStackTrace();
} catch (TransformerException e) { // transformer.transform
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}

savedXML(fileName, xmlWriter.toString());

return xmlWriter.toString();
}

/** Dom方式，解析 XML */
public String XMLResolve() {
StringWriter xmlWriter = new StringWriter();

InputStream is= readXML(fileName);
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(is);//is是一个输入流，返回与输入流对应的文件

doc.getDocumentElement().normalize();
NodeList nlRoot = doc.getElementsByTagName("root");
Element eleRoot = (Element)nlRoot.item(0);
String attrAuthor = eleRoot.getAttribute("author");
String attrDate = eleRoot.getAttribute("date");
xmlWriter.append("root").append("\t\t");
xmlWriter.append(attrAuthor).append("\t");
xmlWriter.append(attrDate).append("\n");

NodeList nlPerson = eleRoot.getElementsByTagName("person");
int personsLen = nlPerson.getLength();
Person []persons = new Person[personsLen];
for(int i=0; i<personsLen; i++) {
Element elePerson = (Element) nlPerson.item(i);
Person person = new Person();

NodeList nlId = elePerson.getElementsByTagName("id");
Element eleId = (Element)nlId.item(0);
String id = eleId.getChildNodes().item(0).getNodeValue();
person.setId(Integer.parseInt(id));

NodeList nlName = elePerson.getElementsByTagName("name");
Element eleName = (Element)nlName.item(0);
String name = eleName.getChildNodes().item(0).getNodeValue();
person.setName(name);

NodeList nlBlog = elePerson.getElementsByTagName("blog");
Element eleBlog = (Element)nlBlog.item(0);
String blog = eleBlog.getChildNodes().item(0).getNodeValue();
person.setBlog(blog);

xmlWriter.append(person.toString()).append("\n");
persons[i] = person;
}

} catch (ParserConfigurationException e) { // factory.newDocumentBuilder
e.printStackTrace();
} catch (SAXException e) { // builder.parse
e.printStackTrace();
} catch (IOException e) { // builder.parse
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}

return xmlWriter.toString();
}

private void savedXML(String fileName, String xml) {
FileOutputStream fos = null;

try {
fos = mContext.openFileOutput(fileName, mContext.MODE_PRIVATE);
byte []buffer = xml.getBytes();
fos.write(buffer);
fos.close();
} catch (FileNotFoundException e) { // mContext.openFileOutput
e.printStackTrace();
} catch (IOException e) { // fos.write
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
//有文件名获取要解析的文件的输入流
private InputStream readXML(String fileName) {
FileInputStream fin = null;

try {
fin = mContext.openFileInput(fileName);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (Exception e) {
e.printStackTrace();
}
return fin;
}
}
///////////////////////////////////////////////////////////////////////////////////////////

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

<TextView
android:id="@+id/tvXMLCreate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dip" />

<TextView
android:id="@+id/tvXMLResolve"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dip" />
</LinearLayout>

</ScrollView>

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