一个使用sax的简单例子

book.xml

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://sauria.com/schemas/apache-xml-book/book
http://www.sauria.com/schemas/apache-xml-book/book.xsd"
version="1.0">

Theodore W. Leung
0-7645-4355-5
December
2003
Wrox

Indianapolis, Indiana

Book.java
package com.sauria.apachexml.ch1;

public class Book {
String title;
String author;
String isbn;
String month;
int year;
String publisher;
String address;

public String getAddress() {
return address;
}

public String getAuthor() {
return author;
}

public String getIsbn() {
return isbn;
}

public String getMonth() {
return month;
}

public String getPublisher() {
return publisher;
}

public String getTitle() {
return title;
}

public int getYear() {
return year;
}

public void setAddress(String string) {
address = string;
}

public void setAuthor(String string) {
author = string;
}

public void setIsbn(String string) {
isbn = string;
}

public void setMonth(String string) {
month = string;
}

public void setPublisher(String string) {
publisher = string;
}

public void setTitle(String string) {
title = string;
}

public void setYear(int i) {
year = i;
}

public String toString() {
return title + " by " + author;
}
}
BookHandler.java
package com.sauria.apachexml.ch1;

import java.util.Stack;

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

public class BookHandler extends DefaultHandler {
private Stack elementStack = new Stack();
private Stack textStack = new Stack();
private StringBuffer currentText = null;
private Book book = null;

public Book getBook() {
return book;
}

public void startElement(
String uri,
String localPart,
String qName,
Attributes attributes)
throws SAXException {
currentText = new StringBuffer();
textStack.push(currentText);
elementStack.push(localPart);
if (localPart.equals("book")) {
String version = attributes.getvalue("", "version");
if (version != null && !version.equals("1.0"))
throw new SAXException("Incorrect book version");
book = new Book();
}
}

public void endElement(String uri, String localPart,
String qName)
throws SAXException {
String text = textStack.pop().toString();
if (localPart.equals("book")) {
} else if (localPart.equals("title")) {
book.setTitle(text);
} else if (localPart.equals("author")) {
book.setAuthor(text);
} else if (localPart.equals("isbn")) {
book.setIsbn(text);
} else if (localPart.equals("month")) {
book.setMonth(text);
} else if (localPart.equals("year")) {
int year;
try {
year = Integer.parseInt(text);
} catch (NumberFormatException e) {
throw new SAXException("year must be a number");
}
book.setYear(year);
} else if (localPart.equals("publisher")) {
book.setPublisher(text);
} else if (localPart.equals("address")) {
book.setAddress(text);
} else {
throw new SAXException("Unknown element for book");
}
elementStack.pop();
}

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

public void warning(SAXParseException ex) throws SAXException {
System.err.println(
"[Warning] " + getLocationString(ex) + ": " +
ex.getMessage());
}

public void error(SAXParseException ex) throws SAXException {
System.err.println(
"[Error] " + getLocationString(ex) + ": " +
ex.getMessage());
}

public void fatalError(SAXParseException ex)
throws SAXException {
System.err.println(
"[Fatal Error] " + getLocationString(ex) + ": " +
ex.getMessage());
throw ex;
}

/** Returns a string of the location. */
private String getLocationString(SAXParseException ex) {
StringBuffer str = new StringBuffer();

String systemId = ex.getSystemId();
if (systemId != null) {
int index = systemId.lastIndexOf('/');
if (index != -1)
systemId = systemId.substring(index + 1);
str.append(systemId);
}
str.append(':');
str.append(ex.getLineNumber());
str.append(':');
str.append(ex.getColumnNumber());

return str.toString();

}

}
SAXMain.java
package com.sauria.apachexml.ch1;

import java.io.IOException;

import org.apache.xerces.parsers.SAXParser;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;

public class SAXMain {

public static void main(String[] args) {
XMLReader r = new SAXParser();
BookHandler bookHandler = new BookHandler();
r.setContentHandler(bookHandler);
r.setErrorHandler(bookHandler);
try {
r.parse("book.xml");
System.out.println(bookHandler.getBook().toString());
System.out.println(bookHandler.getBook().getAddress().toString());
} catch (SAXException se) {
System.out.println("SAX Error during parsing " +
se.getMessage());
se.printStackTrace();
} catch (IOException ioe) {
System.out.println("I/O Error during parsing " +
ioe.getMessage());
ioe.printStackTrace();
} catch (Exception e) {
System.out.println("Error during parsing " +
e.getMessage());
e.printStackTrace();
}
}
}