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Код

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

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class App {
    public static void main(String[] args) {
        try {
            exec();
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }

    private static void exec() throws Exception {
        String xml = "<spreadSheets><spreadSheet><id>1</id><content>abc</content><link>http://google.com</link></spreadSheet><spreadSheet><id>2</id><content>def</content><link>http://google.com</link></spreadSheet></spreadSheets>";
        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser parser = factory.newSAXParser();
        SAXHandler handler = new SAXHandler();
        parser.parse(new InputSource(new StringReader(xml)), handler);

        for (GoogleSpreadSheet googleSpreadSheet : handler.getGoogleSpreadSheets()) {
            System.out.println("    "+googleSpreadSheet);
        }
    }

    public static class SAXHandler extends DefaultHandler {
        private ArrayList<GoogleSpreadSheet> googleSpreadSheets;
        private GoogleSpreadSheet currentGoogleSpreadSheet;
        private StringBuffer buffer;

        public List<GoogleSpreadSheet> getGoogleSpreadSheets() {
            return googleSpreadSheets == null ? Collections.<GoogleSpreadSheet>emptyList() : Collections.unmodifiableList(googleSpreadSheets);
        }

        @Override
        public void startDocument() throws SAXException {
            System.out.println("Started Reading XML...");
            googleSpreadSheets = new ArrayList<GoogleSpreadSheet>();
            buffer = new StringBuffer();
        }

        @Override
        public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
            if (qName.equals("spreadSheet")) {
                if (currentGoogleSpreadSheet != null) {
                    throw new SAXException("Malformed XML");
                }
                currentGoogleSpreadSheet = new GoogleSpreadSheet();
            }
            buffer.setLength(0);
        }

        @Override
        public void characters(char[] ch, int start, int length) throws SAXException {
            buffer.append(ch, start, length);
        }

        @Override
        public void endElement(String uri, String localName, String qName) throws SAXException {
            if (qName.equals("id")) {
                currentGoogleSpreadSheet.id = buffer.toString();
            } else if (qName.equals("content")) {
                currentGoogleSpreadSheet.content = buffer.toString();
            } else if (qName.equals("link")) {
                currentGoogleSpreadSheet.link = buffer.toString();
            } else if (qName.equals("spreadSheet")) {
                googleSpreadSheets.add(currentGoogleSpreadSheet);
                currentGoogleSpreadSheet = null;
            }
            buffer.setLength(0);
        }

        @Override
        public void endDocument() throws SAXException {
            System.out.println("Ended Reading XML...");
            buffer = null;
        }
    }

    public static class GoogleSpreadSheet {
        public String id;
        public String content;
        public String link;

        @Override
        public String toString() {
            return "GoogleSpreadSheet{" +
                   "id='" + id + '\'' +
                   ", content='" + content + '\'' +
                   ", link='" + link + '\'' +
                   '}';
        }
    }
}