activity_main.xml:
MainActivity.java:
package com.example.xmlparsingex;
import java.io.File;
import java.io.FileOutputStream;
import java.nio.charset.CharacterCodingException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import org.w3c.dom.Element;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import android.text.style.BulletSpan;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
EditText et1,et2,et3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et1=(EditText)findViewById(R.id.editText1);
et2=(EditText)findViewById(R.id.editText2);
et3=(EditText)findViewById(R.id.editText3);
}
public void insert(View v)
{
try
{
DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
DocumentBuilder builder=factory.newDocumentBuilder();
String path=Environment.getExternalStorageDirectory()+"/xml/students.xml";
File f=new File(path);
Document d;
Element e;
if(!f.exists())
{
d=builder.newDocument();
e=d.createElement("Students");
}
else
{
d=builder.parse(f);
e=d.getDocumentElement();
}
Element e1=d.createElement("Student");
Element e2=d.createElement("Sid");
Element e3=d.createElement("Sname");
Element e4=d.createElement("Course");
Node n1=d.createTextNode(et1.getText().toString());
Node n2=d.createTextNode(et2.getText().toString());
Node n3=d.createTextNode(et3.getText().toString());
e2.appendChild(n1);
e3.appendChild(n2);
e4.appendChild(n3);
e1.appendChild(e2);
e1.appendChild(e3);
e1.appendChild(e4);
e.appendChild(e1);
if(!f.exists())
{
d.appendChild(e);
}
TransformerFactory Tfactory=TransformerFactory.newInstance();
Transformer transformer=Tfactory.newTransformer();
DOMSource source=new DOMSource(d);
FileOutputStream f1=new FileOutputStream(path);
StreamResult result=new StreamResult(f1);
transformer.transform(source, result);
Toast.makeText(getApplicationContext(), "file inserted successfully", 2000).show();
}
catch (Exception e)
{
e.printStackTrace();
}
}
public void read(View v)
{
try
{
DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
DocumentBuilder builder=factory.newDocumentBuilder();
String path=Environment.getExternalStorageDirectory()+"/xml/students.xml";
File f=new File(path);
Document d = null;
Element e;
if(!f.exists())
{
Toast.makeText(getApplicationContext(), "file not available", 2000).show();
}
else
{
d=builder.parse(f);
e=d.getDocumentElement();
}
NodeList list;
list=d.getElementsByTagName("Sname");
for(int i=0;i
Node n=list.item(i);
Toast.makeText(getApplicationContext(),n.getFirstChild().getNodeValue(),2000).show();
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
public void update(View v) throws ParserConfigurationException
{
try
{
DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
DocumentBuilder builder=factory.newDocumentBuilder();
String path=Environment.getExternalStorageDirectory()+"/xml/students.xml";
File f=new File(path);
Document d=null;
Element e;
if(!f.exists())
{
Toast.makeText(getApplicationContext(), "file not found with this name", 2000).show();
}
else
{
d=builder.parse(f);
e=d.getDocumentElement();
}
NodeList list;
list=d.getElementsByTagName("Sname");
for(int i=0;i
Node n=list.item(i);
if(n.getFirstChild().getNodeValue().equals(et2.getText().toString()))
{
n.getFirstChild().setNodeValue("Mahesh");
}
}
TransformerFactory Tfactory=TransformerFactory.newInstance();
Transformer trasform=Tfactory.newTransformer();
DOMSource source=new DOMSource(d);
File f1=new File(path);
StreamResult result=new StreamResult(f1);
trasform.transform(source, result);
Toast.makeText(getApplicationContext(), "updated successfully", 2000).show();
}
catch (Exception e)
{
// TODO: handle exception
}
}
public void delete(View v)
{
try
{
DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
DocumentBuilder builder=factory.newDocumentBuilder();
String path=Environment.getExternalStorageDirectory()+"/xml/students.xml";
File f=new File(path);
Document d=null;
Element e;
if(!f.exists())
{
Toast.makeText(getApplicationContext(), "file not found with this name", 2000).show();
}
else
{
d=builder.parse(f);
e=d.getDocumentElement();
}
NodeList list;
list=d.getElementsByTagName("Sid");
for(int i=0;i
Node n=list.item(i);
if(n.getFirstChild().getNodeValue().equals(et1.getText().toString()))
{
n.removeChild(n.getFirstChild());
}
}
TransformerFactory Tfactory=TransformerFactory.newInstance();
Transformer transform=Tfactory.newTransformer();
DOMSource source=new DOMSource(d);
File f1=new File(path);
StreamResult result=new StreamResult(f1);
transform.transform(source, result);
Toast.makeText(getApplicationContext(), "deleted successfully", 2000).show();
}
catch (Exception e)
{
// TODO: handle exception
}
}
public void sax(View v)
{
try
{
SAXParserFactory factory=SAXParserFactory.newInstance();
SAXParser parser=factory.newSAXParser();
String path=Environment.getExternalStorageDirectory()+"/xml/students.xml";
File f=new File(path);
parser.parse(f, new DefaultHandler()
{
public void characters(char[] ch, int start, int length) throws SAXException
{
Toast.makeText(getApplicationContext(), new String(ch,start,length), 2000).show();
};
}
);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
No comments:
Post a Comment