类来解析xml元素

superme 2005-03-02 06:16:01

下了个通过类来解析xml元素的程序，但是有错，提示
org.xml.sax.SAXException: System property org.xml.sax.driver not specified

at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:90)
请各位高手指教
Custormer.java
public class Customer {

// Customer member variables.
public String firstName = "";
public String lastName = "";
public String custId = "";

public void print( PrintStream out ) {
out.println( "Customer: " );
out.println( " First Name -> " + firstName );
out.println( " Last Name -> " + lastName );
out.println( " Customer Id -> " + custId );
}

}

Test.java

import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import java.io.*;

public class Test
extends DefaultHandler {
private Customer cust = new Customer();
private CharArrayWriter contents = new CharArrayWriter();
public void startElement(String namespaceURI,
String localName,
String qName,
Attributes attr) throws SAXException {

contents.reset();

}

public void endElement(String namespaceURI,
String localName,
String qName) throws SAXException {

if (localName.equals("FirstName")) {
cust.firstName = contents.toString();
}

if (localName.equals("LastName")) {
cust.lastName = contents.toString();
}

if (localName.equals("CustId")) {
cust.custId = contents.toString();
}

}

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

contents.write(ch, start, length);

}

public Customer getCustomer() {
return cust;
}

public static void main(String[] argv) {

System.out.println("xmlhomework3:");
try {
parser.parse(new InputSource(new FileReader("test.xml")), new Test());
Test t = new Test();
xr.setContentHandler( t );
Customer cust = t.getCustomer();
cust.print(System.out);

}
catch (Exception e) {
e.printStackTrace();
}

}

}

...全文