SAXParser doesn't retrieves XML data from URL

Question

My implemented SAXParser class which uses URL address to process XML data does not returns the result. The class uses additional Currency class which in turn stores two variables currId and rate with setters/getters. When I run my class nothing shows up in java console. Here is the code:

public class MySAXParser extends DefaultHandler {

    private static List<Currencies> currencies = new ArrayList<Currencies>();
    private static Currencies curr = null;
    private static String text = null;

    public static void main(String[] args) {

        String url = "http://nbt.tj/en/kurs/export_xml.php?date=2016-08-01&export=xmlout";

        try {
            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            MySAXParser handler = new MySAXParser();
            URL uri = new URL(url);
            sp.parse(new InputSource(uri.openStream()), handler);
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        for (Currencies curr : currencies) {
            System.out.println(curr.toString());
        }

    }

    public void startElement (String s, String s1, String elementName, Attributes atts) throws SAXException {
        if (elementName.equalsIgnoreCase("valute")) {
            curr = new Currencies();
            curr.setCurrId(atts.getValue("id"));
        }
    }

    public void endElement (String s, String s1, String element) throws SAXException {
        if (element.equals("valute")) {
            currencies.add(curr);
        }
        if (element.equalsIgnoreCase("value")) {
            curr.setRate(Double.parseDouble(text));
        }
    }

    @Override
    public void characters (char[] ch, int start, int length) throws SAXException {
        text = String.copyValueOf(ch, start, length).trim();
    }

}

So, what I missed or doing wrong? Any help would be appreciated.

Answer 1

Here is my attempt that works fine with Java 1.8:

import java.net.URL;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;


public class MySAXParser extends DefaultHandler {

    private List<Currency> currencies = new ArrayList<>();
    private Currency curr = null;
    private StringBuilder sb;

    public static void main(String[] args) {

        String url = "http://nbt.tj/en/kurs/export_xml.php?date=2016-08-01&export=xmlout";

        try {
            SAXParserFactory spf = SAXParserFactory.newInstance();
            spf.setNamespaceAware(true);

            SAXParser sp = spf.newSAXParser();
            MySAXParser handler = new MySAXParser();

            sp.parse(new InputSource(url), handler);

            for (Currency curr : handler.getCurrencies()) {
                System.out.println(curr.toString());
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }

    public List<Currency> getCurrencies() {
        return currencies;
    }

    @Override
    public void startElement(String s, String localName, String elementName, Attributes atts) throws SAXException {
        if (elementName.equalsIgnoreCase("valute")) {
            curr = new Currency();
            currencies.add(curr);
            curr.setCurrId(atts.getValue("ID"));
        } else if (elementName.equalsIgnoreCase("value") || elementName.equalsIgnoreCase("CharCode")) {
            sb = new StringBuilder();
        }
    }

    @Override
    public void endElement(String s, String localName, String elementName) throws SAXException {
        if (elementName.equalsIgnoreCase("value")) {
            curr.setRate(Double.parseDouble(sb.toString()));
            sb = null;
        }
        else if (elementName.equalsIgnoreCase("CharCode")) {
            curr.setCharCode(sb.toString());
            sb = null;
        }
    }

    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        if (sb != null) {
            sb.append(ch, start, length);
        }
    }

}

The class is

public class Currency {

    private String currId;

    /**
     * Get the value of currId
     *
     * @return the value of currId
     */
    public String getCurrId() {
        return currId;
    }

    /**
     * Set the value of currId
     *
     * @param currId new value of currId
     */
    public void setCurrId(String currId) {
        this.currId = currId;
    }

        private double rate;

    /**
     * Get the value of rate
     *
     * @return the value of rate
     */
    public double getRate() {
        return rate;
    }

    /**
     * Set the value of rate
     *
     * @param rate new value of rate
     */
    public void setRate(double rate) {
        this.rate = rate;
    }

    private String charCode;

    /**
     * Get the value of charCode
     *
     * @return the value of charCode
     */
    public String getCharCode() {
        return charCode;
    }

    /**
     * Set the value of charCode
     *
     * @param charCode new value of charCode
     */
    public void setCharCode(String charCode) {
        this.charCode = charCode;
    }

    @Override
    public String toString() {
        return "Currency{" + "currId=" + currId + ", rate=" + rate + ", charCode=" + charCode + '}';
    }

}

A sample output I get is

Currency{currId=840, rate=7.8683, charCode=USD}
Currency{currId=978, rate=8.7448, charCode=EUR}
Currency{currId=960, rate=10.9395, charCode=XDR}
Currency{currId=156, rate=1.1828, charCode=CNY}
Currency{currId=756, rate=8.075, charCode=CHF}
Currency{currId=810, rate=0.1146, charCode=RUB}
Currency{currId=860, rate=0.2655, charCode=UZS}
Currency{currId=417, rate=1.1643, charCode=KGS}
Currency{currId=398, rate=0.2234, charCode=KZT}
Currency{currId=933, rate=3.9424, charCode=BYR}
Currency{currId=364, rate=0.2617, charCode=IRR}
Currency{currId=971, rate=1.139, charCode=AFN}
Currency{currId=586, rate=0.7504, charCode=PKR}
Currency{currId=949, rate=2.6076, charCode=TRY}
Currency{currId=934, rate=2.2481, charCode=TMT}
Currency{currId=826, rate=10.3618, charCode=GBP}
Currency{currId=36, rate=5.9162, charCode=AUD}
Currency{currId=208, rate=1.1755, charCode=DKK}
Currency{currId=352, rate=0.659, charCode=ISK}
Currency{currId=124, rate=5.9699, charCode=CAD}
Currency{currId=414, rate=26.004, charCode=KWD}
Currency{currId=578, rate=0.9193, charCode=NOK}
Currency{currId=702, rate=5.8215, charCode=SGD}
Currency{currId=752, rate=0.9136, charCode=SEK}
Currency{currId=392, rate=0.761, charCode=JPY}
Currency{currId=944, rate=4.9639, charCode=AZN}
Currency{currId=51, rate=1.6516, charCode=AMD}
Currency{currId=981, rate=3.3539, charCode=GEL}
Currency{currId=498, rate=0.3979, charCode=MDL}
Currency{currId=980, rate=0.317, charCode=UAH}
Currency{currId=784, rate=2.1421, charCode=AED}
Currency{currId=682, rate=2.0979, charCode=SAR}
Currency{currId=356, rate=1.175, charCode=INR}
Currency{currId=985, rate=2.0039, charCode=PLN}
Currency{currId=458, rate=1.9313, charCode=MYR}
Currency{currId=764, rate=0.2258, charCode=THB}