SAX Parser Example

Author: Pankaj Kumar

CoreJavaProjects/SAX-Parser-Example/employees.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<Employees>
+	<Employee id="1">
+		<age>29</age>
+		<name>Pankaj</name>
+		<gender>Male</gender>
+		<role>Java Developer</role>
+	</Employee>
+	<Employee id="2">
+		<age>35</age>
+		<name>Lisa</name>
+		<gender>Female</gender>
+		<role>CEO</role>
+	</Employee>
+	<Employee id="3">
+		<age>40</age>
+		<name>Tom</name>
+		<gender>Male</gender>
+		<role>Manager</role>
+	</Employee>
+	<Employee id="4">
+		<age>25</age>
+		<name>Meghna</name>
+		<gender>Female</gender>
+		<role>Manager</role>
+	</Employee>
+</Employees>

CoreJavaProjects/SAX-Parser-Example/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.journaldev.xml</groupId>
+  <artifactId>SAX-Parser-Example</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+</project>

CoreJavaProjects/SAX-Parser-Example/src/main/java/com/journaldev/xml/Employee.java

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+
+package com.journaldev.xml;
+
+public class Employee {
+	private int id;
+	private String name;
+	private String gender;
+	private int age;
+	private String role;
+
+	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 getGender() {
+		return gender;
+	}
+
+	public void setGender(String gender) {
+		this.gender = gender;
+	}
+
+	public int getAge() {
+		return age;
+	}
+
+	public void setAge(int age) {
+		this.age = age;
+	}
+
+	public String getRole() {
+		return role;
+	}
+
+	public void setRole(String role) {
+		this.role = role;
+	}
+
+	@Override
+	public String toString() {
+		return "Employee:: ID=" + this.id + " Name=" + this.name + " Age=" + this.age + " Gender=" + this.gender
+				+ " Role=" + this.role;
+	}
+
+}

CoreJavaProjects/SAX-Parser-Example/src/main/java/com/journaldev/xml/sax/MyHandler.java

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+
+package com.journaldev.xml.sax;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.DefaultHandler;
+
+import com.journaldev.xml.Employee;
+
+public class MyHandler extends DefaultHandler {
+
+	// List to hold Employees object
+	private List<Employee> empList = null;
+	private Employee emp = null;
+	private StringBuilder data = null;
+
+	// getter method for employee list
+	public List<Employee> getEmpList() {
+		return empList;
+	}
+
+	boolean bAge = false;
+	boolean bName = false;
+	boolean bGender = false;
+	boolean bRole = false;
+
+	@Override
+	public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
+
+		if (qName.equalsIgnoreCase("Employee")) {
+			// create a new Employee and put it in Map
+			String id = attributes.getValue("id");
+			// initialize Employee object and set id attribute
+			emp = new Employee();
+			emp.setId(Integer.parseInt(id));
+			// initialize list
+			if (empList == null)
+				empList = new ArrayList<>();
+		} else if (qName.equalsIgnoreCase("name")) {
+			// set boolean values for fields, will be used in setting Employee variables
+			bName = true;
+		} else if (qName.equalsIgnoreCase("age")) {
+			bAge = true;
+		} else if (qName.equalsIgnoreCase("gender")) {
+			bGender = true;
+		} else if (qName.equalsIgnoreCase("role")) {
+			bRole = true;
+		}
+		// create the data container
+		data = new StringBuilder();
+	}
+
+	@Override
+	public void endElement(String uri, String localName, String qName) throws SAXException {
+		if (bAge) {
+			// age element, set Employee age
+			emp.setAge(Integer.parseInt(data.toString()));
+			bAge = false;
+		} else if (bName) {
+			emp.setName(data.toString());
+			bName = false;
+		} else if (bRole) {
+			emp.setRole(data.toString());
+			bRole = false;
+		} else if (bGender) {
+			emp.setGender(data.toString());
+			bGender = false;
+		}
+		
+		if (qName.equalsIgnoreCase("Employee")) {
+			// add Employee object to list
+			empList.add(emp);
+		}
+	}
+
+	@Override
+	public void characters(char ch[], int start, int length) throws SAXException {
+		data.append(new String(ch, start, length));
+	}
+}

CoreJavaProjects/SAX-Parser-Example/src/main/java/com/journaldev/xml/sax/XMLParserSAX.java

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+
+package com.journaldev.xml.sax;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.parsers.SAXParser;
+import javax.xml.parsers.SAXParserFactory;
+
+import org.xml.sax.SAXException;
+
+import com.journaldev.xml.Employee;
+
+public class XMLParserSAX {
+
+	public static void main(String[] args) {
+		SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
+		try {
+			SAXParser saxParser = saxParserFactory.newSAXParser();
+			MyHandler handler = new MyHandler();
+			saxParser.parse(new File("employees.xml"), handler);
+			// Get Employees list
+			List<Employee> empList = handler.getEmpList();
+			// print employee information
+			for (Employee emp : empList)
+				System.out.println(emp);
+		} catch (ParserConfigurationException | SAXException | IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+}