xml & java

**billbo** · February 15th, 2010, 06:30 PM

Im having trouble editing a java program so that it prints the presidents first name and last name and was wondering if anyone could give me some pointers

xml

 
<presidents>
	<president>
		<term from="1889" to="1893"/>
		<name>
			<pres_first>Benjamin</pres_first>
			<pres_last>Harrison</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Levi</first>
				<middle>P</middle>
				<last>Morton</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1893" to="1897"/>
		<name>
			<pres_first>Stephen</pres_first>
			<pres_middle>Grover</pres_middle>
			<pres_last>Cleveland</pres_last>
			<nickname>Grover</nickname>
		</name>
		<party>Democratic</party>
		<vicePresident>
			<name>
				<first>Adlai</first>
				<middle>E</middle>
				<last>Stevenson</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1897" to="1901"/>
		<name>
			<pres_first>William</pres_first>
			<pres_last>McKinley</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Garret</first>
				<middle>A</middle>
				<last>Hobart</last>
			</name>
		</vicePresident>
		<vicePresident>
			<name>
				<first>Theodore</first>
				<last>Roosevelt</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1901" to="1909"/>
		<name>
			<pres_first>Theodore</pres_first>
			<pres_last>Roosevelt</pres_last>
			<nickname>Teddy</nickname>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Charles</first>
				<middle>W</middle>
				<last>Fairbanks</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1909" to="1913"/>
		<name>
			<pres_first>William</pres_first>
			<pres_middle>Howard</pres_middle>
			<pres_last>Taft</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>James</first>
				<middle>S</middle>
				<last>Sherman</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1913" to="1921"/>
		<name>
			<pres_first>Thomas</pres_first>
			<pres_middle>Woodrow</pres_middle>
			<pres_last>Wilson</pres_last>
		</name>
		<party>Democratic</party>
		<vicePresident>
			<name>
				<first>Thomas</first>
				<middle>R</middle>
				<last>Marshall</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1921" to="1923"/>
		<name>
			<pres_first>Warren</pres_first>
			<pres_middle>Gamaliel</pres_middle>
			<pres_last>Harding</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Calvin</first>
				<last>Coolidge</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1923" to="1929"/>
		<name>
			<pres_first>John</pres_first>
			<pres_middle>Calvin</pres_middle>
			<pres_last>Coolidge</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Charles</first>
				<middle>G</middle>
				<last>Dawes</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1929" to="1933"/>
		<name>
			<pres_first>Herbert</pres_first>
			<pres_middle>Clark</pres_middle>
			<pres_last>Hoover</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Charles</first>
				<last>Curtis</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1933" to="1945"/>
		<name>
			<pres_first>Franklin</pres_first>
			<pres_middle>Delano</pres_middle>
			<pres_last>Roosevelt</pres_last>
		</name>
		<party>Democratic</party>
		<vicePresident>
			<name>
				<first>John</first>
				<middle>N</middle>
				<last>Garner</last>
			</name>
		</vicePresident>
		<vicePresident>
			<name>
				<first>Henry</first>
				<middle>A</middle>
				<last>Wallace</last>
			</name>
		</vicePresident>
		<vicePresident>
			<name>
				<first>Harry</first>
				<middle>S</middle>
				<last>Truman</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1945" to="1953"/>
		<name>
			<pres_first>Harry</pres_first>
			<pres_middle>S</pres_middle>
			<pres_last>Truman</pres_last>
		</name>
		<party>Democratic</party>
		<vicePresident>
			<name>
				<first>Alben</first>
				<middle>W</middle>
				<last>Barkley</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1953" to="1961"/>
		<name>
			<pres_first>Dwight</pres_first>
			<pres_middle>David</pres_middle>
			<pres_last>Eisenhower</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Richard</first>
				<middle>M</middle>
				<last>Nixon</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1961" to="1963"/>
		<name>
			<pres_first>John</pres_first>
			<pres_middle>Fitzgerald</pres_middle>
			<pres_last>Kennedy</pres_last>
			<nickname>Jack</nickname>
		</name>
		<party>Democratic</party>
		<vicePresident>
			<name>
				<first>Lyndon</first>
				<middle>Baines</middle>
				<last>Johnson</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1963" to="1969"/>
		<name>
			<pres_first>Lyndon</pres_first>
			<pres_middle>Baines</pres_middle>
			<pres_last>Johnson</pres_last>
		</name>
		<party>Democratic</party>
		<vicePresident>
			<name>
				<first>Hubert</first>
				<last>Humphrey</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1969" to="1974"/>
		<name>
			<pres_first>Richard</pres_first>
			<pres_middle>Milhous</pres_middle>
			<pres_last>Nixon</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Spiro</first>
				<middle>T</middle>
				<last>Agnew</last>
			</name>
		</vicePresident>
		<vicePresident>
			<name>
				<first>Gerald</first>
				<middle>Rudolph</middle>
				<last>Ford</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1974" to="1977"/>
		<name>
			<pres_first>Gerald</pres_first>
			<pres_middle>Rudolph</pres_middle>
			<pres_last>Ford</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Nelson</first>
				<last>Rockefeller</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1977" to="1981"/>
		<name>
			<pres_first>James</pres_first>
			<pres_middle>Earl</pres_middle>
			<pres_last>Carter</pres_last>
			<nickname>Jimmy</nickname>
		</name>
		<party>Democratic</party>
		<vicePresident>
			<name>
				<first>Walter</first>
				<last>Mondale</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1981" to="1989"/>
		<name>
			<pres_first>Ronald</pres_first>
			<pres_middle>Wilson</pres_middle>
			<pres_last>Reagan</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>George</first>
				<last>Bush</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1989" to="1993"/>
		<name>
			<pres_first>George</pres_first>
			<pres_middle>Herbert</pres_middle>
			<pres_middle>Walker</pres_middle>
			<pres_last>Bush</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Dan</first>
				<last>Quayle</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="1993" to="2001"/>
		<name>
			<pres_first>William</pres_first>
			<pres_middle>Jefferson</pres_middle>
			<pres_last>Clinton</pres_last>
			<nickname>Bill</nickname>
		</name>
		<party>Democratic</party>
		<vicePresident>
			<name>
				<first>Al</first>
				<last>Gore</last>
			</name>
		</vicePresident>
	</president>
	<president>
		<term from="2001" to="2008"/>
		<name>
			<pres_first>George</pres_first>
			<pres_middle>W</pres_middle>
			<pres_last>Bush</pres_last>
		</name>
		<party>Republican</party>
		<vicePresident>
			<name>
				<first>Dick</first>
				<last>Cheney</last>
			</name>
		</vicePresident>
	</president>
 
<president>
		<term from="2009" to="present"/>
		<name>
			<pres_first>Barack</pres_first>
			<pres_last>Obama</pres_last>
		</name>
		<party>Democratic</party>
		<vicePresident>
			<name>
				<first>Joe</first>
				<last>Biden</last>
			</name>
		</vicePresident>
	</president>
</presidents>

java file

 
 
// Program based on Java tutorial at
// http://java.sun.com/j2ee/1.4/docs/tutorial/doc/JAXPSAX3.html
// Modification for Java 6 based on
// docs/technotes/guides/xml/jaxp/ReleaseNotes_160.html#feature
 
import java.io.IOException;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
 
import java.util.Stack;
 
public class ModesProcessor {
 
	public static void main (String argv []) {
 
		String fileName = "modes3.xml";
 
		SAXParser       producer;
		DefaultHandler  consumer;
 
		// Get an instance of the default XML parser class
		SAXParserFactory factory = SAXParserFactory.newInstance();
 
		try {
	  	producer = factory.newSAXParser();
		}
		catch (Throwable t) {
			System.err.println (
					"Can't get parser, check configuration: "
					+ t.getMessage ());
			return;
		}
 
		// set up the consumer
		try {
			// Get a consumer for all the parser events
			consumer = new MyHandler ();
		}
		catch (Exception e) {
			// consumer setup can uncover errors,
			// though this simple one shouldn't
			System.err.println (
					"Can't set up consumers:"
					+ e.getMessage ());
			return;
		}
 
		// Do the parse using consumer as the handler
		try {
			producer.parse (fileName, consumer);
			System.out.println("\nXML document in file " + fileName + " parsed OK");
		}
		catch (IOException e) {
			System.out.println ("I/O error:\n" + e.toString());
		}
		catch (SAXParseException e) {
			System.out.println ("Parsing error:\n" + e.toString ());
		}
		catch (SAXException e) {
		  System.out.println(fileName + " unspecified SAX exception:\n"
		    + e.toString());
		}
	}
}
 
// This class handles all call-backs from the parser.
// Methods startElement, endElement and characters
// play a similar role to the method actionPerformed
// in the interface Action Listener.
 
// In this example these methods use a stack to keep
// track of the structure of the XML document.
 
class MyHandler extends DefaultHandler {
 
	private Stack<String>	stack = new Stack<String> ();
 
	public MyHandler() {
		super();
	}
 
	public void startElement(String uri, String local, String qName,
														Attributes atts) throws SAXException {
		stack.push (qName);
	}
 
	public void characters (char buf [], int offset, int length)
														throws SAXException {
		if ("presidents".equals (stack.peek ())) {
			String s = new String (buf, offset, length);
			System.out.print (stack.peek() + " = " + s + "\n");
		}
		return;
	}
 
	public void endElement (String uri, String local, String qName)
														throws SAXException {
		stack.pop ();
  }
 
}

any help greatly appreciated

does any one know how i could construct a for loop method so it returns the term dates in the following xml file;

**Json** · February 17th, 2010, 03:25 AM

If you get a hold of JDOM you can do it like this.

import java.io.File;
import java.util.List;
 
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
 
public class JdomTest1 {
    @SuppressWarnings("unchecked")
    public static void main(String[] args) throws Throwable {
        final SAXBuilder builder = new SAXBuilder();
        final Document document = builder.build(new File("modes3.xml"));
 
        final List<Element> presidents = document.getRootElement().getChildren("president");
 
        if (presidents != null && !presidents.isEmpty()) {
            for (final Element president : presidents) {
                final String from = president.getChild("term").getAttributeValue("from");
                final String to = president.getChild("term").getAttributeValue("to");
                final Element nameElement = president.getChild("name");
 
                if (nameElement != null) {
                    System.out.println("President [" + nameElement.getChildText("pres_first") + " " + nameElement.getChildText("pres_last") + "] served from [" + from + "] to [" + to + "]");
                }
            }
        }
    }
}

// Json

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