Android 創建與解析XML（二）—— Dom方式
1. Dom概述Dom方式創建XML，應用了標準xml構造器javax.xml.parsers.DocumentBuilder來創建XML文檔，需要導入以下內容javax.xml.parsersjavax.xml.parsers.DocumentBuilder
javax.xml.parsers.DocumentBuilderFactory
javax.xml.parsers.ParserConfigurationException;
javax.xml.transformjavax.xml.transform.TransformerFactory
javax.xml.transform.Transformer
javax.xml.transform.dom.DOMSource
javax.xml.transform.stream.StreamResult
javax.xml.transform.OutputKeys;
javax.xml.transform.TransformerFactoryConfigurationError;
javax.xml.transform.TransformerConfigurationException;
javax.xml.transform.TransformerException;
org.w3c.dom org.w3c.dom.Document;
org.w3c.dom.Element;
org.w3c.dom.Node;
org.w3c.dom.DOMException;
org.w3c.dom.NodeList;
org.xml.sax.SAXException;sdk源碼查看路徑（google code）
創建和解析xml的效果圖：http://my.csdn.net/uploads/201204/29/1335707958_1276.png
2、Dom 創建XMLDom，借助javax.xml.parsers.DocumentBuilder，可以創建org.w3c.dom.Document 對象。使用來自DocumentBuilderFactory 的DocumentBuilder 對像在Android 設備上創建與解析XML 文檔。您將使用XML pull 解析器的擴展來解析XML 文檔。/** Dom方式，創建 XML */
public String domCreateXML() {
String xmlWriter = null;
Person []persons = new Person; //創建節點Person對象
persons = new Person(1, "sunboy_2050", "http://blog.csdn.net/sunboy_2050");
persons = new Person(2, "baidu", "http://www.baidu.com");
persons = 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.getId() + "");
eleId.appendChild(nodeId);
elePerson.appendChild(eleId);
Element eleName = doc.createElement("name");
Node nodeName = doc.createTextNode(persons.getName());
eleName.appendChild(nodeName);
elePerson.appendChild(eleName);
Element eleBlog = doc.createElement("blog");
Node nodeBlog = doc.createTextNode(persons.getBlog());
eleBlog.appendChild(nodeBlog);
elePerson.appendChild(eleBlog);
}
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();
}運行結果：
3、Dom 解析XML
Dom方式，解析XML是創建XML的逆過程，主要用到了builder.parse(is)進行解析，然後通過Tag、NodeList、Element、childNotes等得到Element和Node屬性或值。/** Dom方式，解析 XML*/
public String domResolveXML() {
StringWriter xmlWriter = new StringWriter();
InputStream is= readXML(fileName);
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(is);
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;
for(int i=0; i<personsLen; i++) {
Element elePerson = (Element) nlPerson.item(i); // person節點
Person person = new Person(); //創建Person對象
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 = 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();
}
運行結果：
4、Person類Person類，是創建xml的單位實例，基於Java面向對象定義的一個類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";
}
}代碼下載
頁:
[1]