Basic android development tutorial-xml file parsing in three ways

1. sax Method Copy codeThe Code is as follows :/**
* Use sax for parsing
*/
Public class SaxParse {
/**
* Sax Parser
*/
Private SAXParser parser;
Public SaxParse (){
Try {
SAXParserFactory f = SAXParserFactory. newInstance ();
Parser = f. newSAXParser ();
} Catch (ParserConfigurationException e ){
E. printStackTrace ();
} Catch (Exception e ){
E. printStackTrace ();
}
}
Public List <Person> doParse (InputStream is ){
Try {
XmlHandler h = new XmlHandler ();
Parser. parse (is, h );
Return h. getpersons ();
} Catch (Exception e ){
E. printStackTrace ();
}
Return null;
}
/**
* Processor
*/
Class XmlHandler extends DefaultHandler {
List <Person> persons = null;
Person person = null;
// Name of the current element
Private String currEleName;
/**
* This method is triggered by a text node.
*/
Public void characters (char [] ch, int start, int length) throws SAXException {
String str = new String (ch, start, length );
// Name
If ("name". equals (currEleName )){
Person. name = str;
}
Else if ("age". equals (currEleName )){
Person. age = Integer. parseInt (str );
}
}
Public void endDocument () throws SAXException {
}
/**
* Element end
*/
Public void endElement (String uri, String localName, String qName)
Throws SAXException {
If ("person". equals (localName )){
Persons. add (person );
}
// Empty the current element
Else if ("name". equals (currEleName) | ("age". equals (currEleName ))){
This. currEleName = "";
}
}
/**
* Document start event
*/
Public void startDocument () throws SAXException {
Persons = new ArrayList <Person> ();
}
/**
* Element start event
* LocalName: local place name
* Uri: namespace
* QName: qualified name, prefix + local place name
*/
Public void startElement (String uri, String localName, String qName,
Attributes attributes) throws SAXException {
// Instantiate the person object
If ("person". equals (localName )){
Person = new Person ();
Person. id = Integer. parseInt (attributes. getValue (0 ));
}
// Name Element
Else if ("name". equals (localName )){
This. currEleName = "name ";
}
// Name Element
Else if ("age". equals (localName )){
This. currEleName = "age ";
}
}
Public List <Person> getpersons (){
Return persons;
}
}
}

2. dom ModeCopy codeThe Code is as follows :/**
* DOM Parsing
*/
Public class DomParse {
//
Private DocumentBuilder builder;
Public DomParse (){
Try {
DocumentBuilderFactory f = DocumentBuilderFactory. newInstance ();
This. builder = f. newDocumentBuilder ();
} Catch (Exception e ){
E. printStackTrace ();
}
}
Public List <Person> doParse (InputStream is ){
List <Person> persons = new ArrayList <Person> ();
Person person = null;
Try {
Document doc = builder. parse (is );
NodeList list = doc. getElementsByTagName ("person ");
Element ele = null;
For (int I = 0; I <list. getLength (); I ++ ){
Ele = (Element) list. item (I );
Person = new Person ();
Person. id = Integer. parseInt (ele. getAttribute ("id "));
Person. name = getSubElementTextContent (ele, "name ");
Person. age = Integer. parseInt (getSubElementTextContent (ele, "age "));
Persons. add (person );
}
} Catch (Exception e ){
E. printStackTrace ();
}
Return persons;
}
/**
* Obtain the text content in the middle of the specified resource.
*/
Private String getSubElementTextContent (Element ele, String tagName ){
NodeList list = ele. getElementsByTagName (tagName );
Element e = (Element) list. item (0 );
// Obtain the intermediate text node
Return e. getTextContent ();
}
}

3. pull ModeCopy codeThe Code is as follows :/**
* Pull resolution and pull mode. You can manually control whether the next event is triggered.
*/
Public class PullParse {
Public List <Person> doParse (InputStream is ){
List <Person> persons = null;
Person person = null;
Try {
XmlPullParser parser = Xml. newPullParser ();
// Set the resolution data source
Parser. setInput (is, "UTF-8 ");
// Obtain the Event Type
Int eventType = parser. getEventType ();
String eleName = null;
While (eventType! = XmlPullParser. END_DOCUMENT ){
Switch (eventType ){
// Start the document
Case XmlPullParser. START_DOCUMENT:
Persons = new ArrayList <Person> ();
Break;
// Element start
Case XmlPullParser. START_TAG:
EleName = parser. getName ();
If ("person". equals (eleName )){
Person = new Person ();
Person. id = Integer. parseInt (parser. getAttributeValue (0 ));
}
Else if ("name". equals (eleName )){
Person. name = parser. nextText ();
}
Else if ("age". equals (eleName )){
Person. age = Integer. parseInt (parser. nextText ());
}
Break;
// Mark the end
Case XmlPullParser. END_TAG:
EleName = parser. getName ();
If ("person". equals (eleName )){
Persons. add (person );
}
Break;
}
// Manually activate the trigger of the next event
EventType = parser. next ();
}
} Catch (Exception e ){
E. printStackTrace ();
}
Return persons;
}
}