Home J2me Kxml KXML Parse Example
Questions:Ask|Latest


 
 

Share on Google+Share on Google+

KXML Parse Example

Advertisement
In this section, we will develop a J2ME application to parses the RSS document and then display the data on the mobile screen.

J2ME Kxml Connection Example

     

This is the XML connection example. In this section, we'll develop a J2ME application that a user can connect to the xml file from localhost and print it on the console.

To develop this type of application we have the following steps:

  • create a AddressBook.xml file in root folder of your server with name and address tags.
  • run the server by startup.bat
  • create the MIDlet (AddressDB.java).
  • build the midlet and then run.
  • approve to send and receive the data using network.
  • output display on console.  

AddressBook is a simple XML format that summarizes name and address tags. when the program will executed,AddressBook displays the name and address from the addressbook data on the console.

 

The Entire Application is as follows:

 

 

AddressDB.java

import java.io.*;

import org.kxml.*;
import org.kxml.io.*;
import org.kxml.kdom.*;
import org.kxml.parser.*;

import javax.microedition.io.*;
import javax.microedition.rms.*;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class AddressDB extends MIDlet{
  private static RecordStore rs = null;

  public void startApp(){
  try {
  rs = RecordStore.openRecordStore("addressbook", true);
  loadXML();
  addAddress("Sandeep Kumar Suman", "Gorakhpur");
  getName(1);
  getAddress(1);
  } catch (RecordStoreException e) {
  System.out.println(e);
  e.printStackTrace();
  }
  }

  public void addAddress(String Name, String Address)  {
  ByteArrayOutputStream os = new ByteArrayOutputStream();
  DataOutputStream output = new DataOutputStream(os);

  try {
  output.writeUTF(Name + "," + Address);
  } catch (IOException e) {
  System.out.println(e);
  e.printStackTrace();
  }
  byte[] b = os.toByteArray();
  try {
  rs.addRecord(b, 0, b.length);
  } catch (RecordStoreException e) {
  System.out.println(e);
  e.printStackTrace();
  }
  }

  public static String getName(int index)  {
  int counter = 1;
  int commalocation = 0;
  String name = null;
  try {
  RecordEnumeration enumRec =  rs.enumerateRecords(null, null, false);
  while ((counter <= index) && (enumRec.hasNextElement())) {
  String strTemp = new String(enumRec.nextRecord());
  commalocation = strTemp.indexOf(',');
  name = strTemp.substring(2, commalocation);
  counter++;
  }
  } catch (Exception e) {
  System.out.println(e);
  e.printStackTrace();
  }
  System.out.println("Name::::::::"+name);
  return name;  
  }

  public static String getAddress(int index)  {
  int counter = 1;
  int commalocation = 0;
  String address = null;

  try {
  RecordEnumeration enumRec = rs.enumerateRecords(null, null, false);
  while ((counter <= index) && (enumRec.hasNextElement())){
  String strTemp = new String(enumRec.nextRecord());
  commalocation = strTemp.indexOf(',');
  address = strTemp.substring(commalocation + 1);
  counter++;
  }
  } catch (Exception e) {
  System.out.println(e);
  e.printStackTrace();
  }
  System.out.println("Address::::::::"+address);
  return address;
  }

  public static int recordCount(){
  int count = 0;
  try  {
  count = rs.getNumRecords();
  } catch (Exception e) {
  System.out.println(e);
  e.printStackTrace();
  }
  return count;
  }

  public void loadXML()  {
  StreamConnection c = null;
  InputStream s = null;
  Attribute att = null;
  String Name = null;
  String Address = null;
  try {
  rs.closeRecordStore();
  rs.deleteRecordStore("addressbook");
  rs = RecordStore.openRecordStore("addressbook", true);
  } catch (Exception e) {
  System.out.println(e);
  e.printStackTrace();
  }
  try {
  c = (StreamConnection)Connector.open("http://localhost:8080/AddressBook.xml");
  s = c.openInputStream();

  XmlParser parser = new XmlParser(new InputStreamReader(s));
  Document document = new Document();
  document.parse(parser);
  System.out.println(document);
  Element root = document.getRootElement();
  int children = root.getChildCount();
  
  for(int i=0; i < children; i++) {
  if (root.getType(i) == Xml.ELEMENT) {
  Element el = root.getElement(i);
  int babies = el.getChildCount();
  for(int j=0; j < babies; j++){
  if (el.getType(j) == Xml.ELEMENT) {
  Element elName = (Element)el.getChild(j);
  if (elName.getName().equals("name")){
  att = elName.getAttribute("value");
  Name = att.getValue();
  } else if (elName.getName().equals("address")){
  att = elName.getAttribute("value");
  Address = att.getValue();
  }
  }
  }
  addAddress(Name, Address);
  }
  }
  } catch (IOException err) {
  System.out.println(err);
  err.printStackTrace();
  }
  }
  
  public void pauseApp(){}
  
  public void destroyApp(boolean unconditional){
  notifyDestroyed();
  }
} 

AddressBook.xml

<?xml version="1.0"?>

<addressbook >

  <name>Sandeep Kumar Suman</name> 
   <address>Gorakhpur</address> 

</addressbook>

Download Source Code

Advertisements

Liked it!  Share this Tutorial


Follow us on Twitter, or add us on Facebook or Google Plus to keep you updated with the recent trends of Java and other open source platforms.

Posted on: December 18, 2008

Ask Questions?    Discuss: KXML Parse Example   View All Comments

Post your Comment


Your Name (*) :
Your Email :
Subject (*):
Your Comment (*):
  Reload Image
 
 
Comments
DMCA.com