Class Code 9/20/17

student.xml

<?xml version="1.0" encoding="UTF-8" ?>
<students>
  <student id="800">
    <name>Sherlock Holmes</name>
    <address>221B Baker Street</address>
  </student>
  <student id="801">
    <name>John Watson</name>
    <address>221B Baker Street</address>
  </student>
</students>

<?xml version="1.0" encoding="UTF-8" ?>

<name>Sherlock Holmes</name>

<address>221B Baker Street</address>

</student>

<name>John Watson</name>

<address>221B Baker Street</address>

</student>

</students>

Student.java

public class Student {
    private int id;
    private String name;
    private String address;

    public Student(int id, String name, String address){
        this.id = id;
        this.name = name;
        this.address = address;
    }

    public String toString(){
        return name + " (" + id + ") lives at " + address;
    }
}

public class Student {

private int id;

private String name;

private String address;

public Student(int id, String name, String address){

this.id = id;

this.name = name;

this.address = address;

}

public String toString(){

return name + " (" + id + ") lives at " + address;

}

StudentXMLParser.java

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;

import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;

import java.util.ArrayList;

public class StudentXMLParser extends DefaultHandler {
    private int readId;
    private String readName, readAddress;

    private String stringBuffer;

    private ArrayList<Student> students;
    
    public void startDocument() throws SAXException {
        System.out.println("Start Document");
        students = new ArrayList<Student>();
    }

    public void startElement(String namespaceURI,
                             String localName,
                             String qName, 
                             Attributes atts) throws SAXException {
        System.out.println("Start Element: " + qName);

        if (qName.equals("student")){
            String xmlId = atts.getValue("id");
            System.out.println("id: " + xmlId);
            readId = Integer.parseInt(xmlId);
        }
    }

    public void endElement(String namespaceURI,
                           String localName,
                           String qName) throws SAXException {
        System.out.println("End Element: " + qName);

        if (qName.equals("name"))
            readName = stringBuffer;
        else if (qName.equals("address"))
            readAddress = stringBuffer;
        else if (qName.equals("student")){
            students.add(new Student(readId, readName, readAddress));
            //System.out.println("read ID : " + readId);
            //System.out.println("read Name : " + readName);
            //System.out.println("read Address : " + readAddress);
            readName = "";
            readAddress = "";
        }
    }

    public void endDocument() throws SAXException {
        System.out.println("End Document");
    }

    public void characters(char ch[], int start, int length)
        throws SAXException {
        stringBuffer = new String(ch, start, length).trim();
        System.out.println(stringBuffer);
    }

    public ArrayList<Student> getStudents(){
        return students;
    }

    public static void main(String[] args){
        SAXParserFactory spf = SAXParserFactory.newInstance();
        try {
            InputStream xmlInput  = new FileInputStream("student.xml");
            SAXParser saxParser = spf.newSAXParser();
            StudentXMLParser sxp = new StudentXMLParser();
            saxParser.parse(xmlInput, sxp);

            for (Student s : sxp.getStudents()){
                System.out.println(s);
            }
        }
        catch(SAXException|ParserConfigurationException|IOException e){
            e.printStackTrace();
        }
    }
}

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;

import javax.xml.parsers.ParserConfigurationException;

import java.io.FileInputStream;

import java.io.InputStream;

import java.io.IOException;

import java.util.ArrayList;

public class StudentXMLParser extends DefaultHandler {

private int readId;

private String readName, readAddress;

private String stringBuffer;

private ArrayList<Student> students;

public void startDocument() throws SAXException {

System.out.println("Start Document");

students = new ArrayList<Student>();

}

public void startElement(String namespaceURI,

String localName,

String qName,

Attributes atts) throws SAXException {

System.out.println("Start Element: " + qName);

if (qName.equals("student")){

String xmlId = atts.getValue("id");

System.out.println("id: " + xmlId);

readId = Integer.parseInt(xmlId);

}

public void endElement(String namespaceURI,

String localName,

String qName) throws SAXException {

System.out.println("End Element: " + qName);

if (qName.equals("name"))

readName = stringBuffer;

else if (qName.equals("address"))

readAddress = stringBuffer;

else if (qName.equals("student")){

students.add(new Student(readId, readName, readAddress));

//System.out.println("read ID : " + readId);

//System.out.println("read Name : " + readName);

//System.out.println("read Address : " + readAddress);

readName = "";

readAddress = "";

}

public void endDocument() throws SAXException {

System.out.println("End Document");

}

public void characters(char ch[], int start, int length)

throws SAXException {

stringBuffer = new String(ch, start, length).trim();

System.out.println(stringBuffer);

}

public ArrayList<Student> getStudents(){

return students;

}

public static void main(String[] args){

SAXParserFactory spf = SAXParserFactory.newInstance();

try {

InputStream xmlInput = new FileInputStream("student.xml");

SAXParser saxParser = spf.newSAXParser();

StudentXMLParser sxp = new StudentXMLParser();

saxParser.parse(xmlInput, sxp);

for (Student s : sxp.getStudents()){

System.out.println(s);

}

catch(SAXException|ParserConfigurationException|IOException e){

e.printStackTrace();

}

Hi There!

student.xml

Student.java

StudentXMLParser.java