Aim:
To create simple SAX parser to parse
XML document
Algorithm:
- Create
a Sax parser and parse the xml
- In the
event handler create the employee object
- Print
out the data
Program:
SAXParserExample.java
import
java.io.IOException;
import
java.util.ArrayList;
import
java.util.Iterator;
import
java.util.List;
import
javax.xml.parsers.ParserConfigurationException;
import
javax.xml.parsers.SAXParser;
import
javax.xml.parsers.SAXParserFactory;
import
org.xml.sax.Attributes;
import
org.xml.sax.SAXException;
import
org.xml.sax.helpers.DefaultHandler;
public class
SAXParserExample extends DefaultHandler{
List myEmpls;
private String tempVal;
//to maintain context
private Employee tempEmp;
public SAXParserExample(){
myEmpls = new
ArrayList();
}
public void runExample() {
parseDocument();
printData();
}
private void parseDocument() {
//get a factory
SAXParserFactory spf =
SAXParserFactory.newInstance();
try {
//get a new
instance of parser
SAXParser sp
= spf.newSAXParser();
//parse the
file and also register this class for call backs
sp.parse("employees.xml",
this);
}catch(SAXException se)
{
se.printStackTrace();
}catch(ParserConfigurationException
pce) {
pce.printStackTrace();
}catch (IOException ie)
{
ie.printStackTrace();
}
}
/**
* Iterate through the list and print
* the contents
*/
private void printData(){
System.out.println("No
of Employees '" + myEmpls.size() + "'.");
Iterator it =
myEmpls.iterator();
while(it.hasNext()) {
System.out.println(it.next().toString());
}
}
//Event Handlers
public void startElement(String uri,
String localName, String qName, Attributes attributes) throws SAXException {
//reset
tempVal = "";
if(qName.equalsIgnoreCase("Employee"))
{
//create a
new instance of employee
tempEmp =
new Employee();
tempEmp.setType(attributes.getValue("type"));
}
}
public void characters(char[] ch,
int start, int length) throws SAXException {
tempVal = new
String(ch,start,length);
}
public void endElement(String uri,
String localName, String qName) throws SAXException {
if(qName.equalsIgnoreCase("Employee"))
{
//add it to
the list
myEmpls.add(tempEmp);
}else if
(qName.equalsIgnoreCase("Name")) {
tempEmp.setName(tempVal);
}else if (qName.equalsIgnoreCase("Id"))
{
tempEmp.setId(Integer.parseInt(tempVal));
}else if
(qName.equalsIgnoreCase("Age")) {
tempEmp.setAge(Integer.parseInt(tempVal));
}
}
public static void main(String[]
args){
SAXParserExample spe =
new SAXParserExample();
spe.runExample();
}
}
Employee.java
public class
Employee {
private String name;
private int age;
private int id;
private String type;
public Employee(){
}
public Employee(String name, int id,
int age,String type) {
this.name = name;
this.age = age;
this.id = id;
this.type = type;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
