kxmldemo_pull.java~3~

使用kxml解析xml

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;
import org.kxml.parser.*;
import org.kxml.*;

/**
 * A simple app to demonstrate pull parsing using kXML.  It opens
 * a file from the resource directory /res then passes the InputStream
 * to a kXML parser.  The application will then ask the parser for the
 * next event.  If the start tag of an <address> element is
 * encountered then control is passed to the parseAddress function
 * which will begin retrieving data and continue doing so until
 * an end tag for </address> is encountered.
 *
 * This demonstrates how easy it is to use a pull parser by
 * fragmenting node parsing between functions.
 *
 * @author Robert Cadena
 */
//xml
/*
 <address_book>
         <!-- Just some info here for the owner of the
              address book -->
         <info>
                 <owner>Robert Cadena</owner>
         </info>
         <address>
                 <name>Robert Cadena</name>
                 <street_1>5555 Fake Street </street_1>
                 <street_2>Suit 202</street_2>
                 <city>Fake City</city>
                 <state>CA</state>
                 <zipcode>900099</zipcode>
         </address>
         <address>
                 <name>Fake Name</name>
                 <street_1>3232 Another Street </street_1>
                 <city>Another City</city>
                 <state>TX</state>
                 <zipcode>79999</zipcode>
         </address>

 </address_book>

*/
public class kXMLDemo_pull extends javax.microedition.midlet.MIDlet {

	/**
	 * Name of resource file we'll use later
	 */
	public static final String resfile_name = "/res/address_book.xml";

	/**
	 * Creates an XML parser and parses a file in the local store looking
	 * for address tags.  When it encounters such a tag it passes the
	 * parser to another function.  If the end of document is reached
	 * it exits.
	 */
	public void beginParse() {
		XmlParser parser = null;

		try {
			// create the parser and pass it the input stream for a file
			// Here you could also pass it an HTTP input stream
			parser = new XmlParser( new InputStreamReader( this.getClass().getResourceAsStream(resfile_name) ), 300);

			// this is the event object we'll use to test against
			ParseEvent event = null;

			// now begin parsing the address and read until we get the
			// END_DOCUMENT event.
			while ( (event = parser.read()).getType() != Xml.END_DOCUMENT ) {


				// If it's a start tag, then test to see what kind it is
				if (event.getType() == Xml.START_TAG) {

					// get the name and find out if it's "address"
					String name = event.getName();
					if (name != null && name.equals("address")) {
						// Print notification to System.err
						System.err.println("--[ ADDRESS ]-----------");

						// it is an address tag, so pass the parser over
						// to the function that will parse the address
						parseAddressTag( parser );

						// Print end notification to System.err
						System.err.println("------------------------\n");
					}

					name = null;
				}

				event = null;
			}


		} catch (IOException ioe) {
			// report error
			System.err.println("XML Parsing Error: " + ioe);
			ioe.printStackTrace();
		} finally {
			// try to close, and ignore any exceptions
			try {
				parser = null;
			} catch (Exception ignored) { }
		}
	}

	/**
	 * Parses the portion of the document between <address> tags.  Once
	 * the end of that tag is reached control is returned to the calling
	 * function.
	 *
	 * @throws IOException Exception thrown by XmlParser
	 */
	public void parseAddressTag( XmlParser parser ) throws IOException {
		ParseEvent event = null;

		// Instead of actually reading the next event we "peek" for the
		// next event.  It basically returns the next event but doesn't
		// move the parser ahead towards the next event.
		while ((event = parser.peek()).getType() != Xml.END_DOCUMENT) {

			// we'll use these later
			String name = event.getName();
			int type = event.getType();

			// test to see if it's the end tag of an address tag
			// and then return control to calling function
			if (type == Xml.END_TAG && name.equals("address")) {
				event = null;
				name = null;
				return;
			}

			// now we read the event
			event = parser.read();

			// if it's not a start tag, then continue
			if (type != Xml.START_TAG) {
				// help out gc
				event = null;
				continue;
			}

			// if we know it's a start tag, then we skip forward one event
			// and read the TEXT between that tag
			ParseEvent next = parser.read();

			// if it's not a text event then skip it
			if (next.getType() != Xml.TEXT) {
				event = null;
				next = null;
				continue;
			}

			// now we get the text between those tags
			String text = next.getText();

			// and finally we print it out
			System.err.println( name + ": " + text );

			event = null;
			text = null;
			next = null;

		}
	}


	/**
	 * Starts the parser
	 *
	 * @see javax.microedition.midlet.MIDlet#startApp()
	 */
	protected void startApp() throws MIDletStateChangeException {
		beginParse();
	}

	/**
	 * @see javax.microedition.midlet.MIDlet#destroyApp(boolean)
	 */
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
	}

	/**
	 * @see javax.microedition.midlet.MIDlet#pauseApp()
	 */
	protected void pauseApp() {
	}


}