JSP and SAX : XML « JSP « Java
JSP and SAX
<%@ page import="javax.xml.parsers.SAXParserFactory,
javax.xml.parsers.SAXParser,
com.java2s.MyHandler"%>
<html>
<head><title>JSP and SAX</title></head>
<body>
<%
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
MyHandler myHandler = new MyHandler(out);
parser.parse("http://localhost:8080/chapter10/people.xml",
myHandler);
%>
</body>
</html>
package com.java2s;
import java.io.IOException;
import javax.servlet.jsp.JspWriter;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class MyHandler extends DefaultHandler
{
private int stepCount, totalAge;
private JspWriter out;
private boolean insideAgeElement;
public MyHandler(JspWriter out)
{
this.out = out;
}
public void startDocument() throws SAXException
{
try
{
out.write(++stepCount + ". Start of document<br>");
}
catch (IOException e)
{
throw new SAXException(e);
}
} // end of startDocument()
public void endDocument() throws SAXException
{
try
{
out.write(++stepCount + ". End of document<p>");
out.write("The total of all ages in the XML document is <b><i>"
+ totalAge + "</i></b>");
}
catch (IOException e)
{
throw new SAXException(e);
}
} // end of endDocument()
public void startElement(String namespaceURI, String localName,
String qName, Attributes attrs)
throws SAXException
{
if ( qName.equals("age"))
{
insideAgeElement = true;
}
try
{
out.write(++stepCount + ". Start of element: <b>" + qName + "</b>");
int numberOfAttributes = attrs.getLength();
if ( numberOfAttributes > 0 )
{
out.write(". Attributes: <ul>");
} // end of if ()
else
out.write("<br>");
for ( int i=0; i<numberOfAttributes; i++)
{
out.write("<li>" + attrs.getQName(i) + " = "
+ attrs.getValue(i) + "</li>");
} // end of for ()
if ( numberOfAttributes > 0 )
{
out.write("</ul>");
}
}
catch (IOException e)
{
throw new SAXException(e);
}
} // end of startElement()
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException
{
if ( qName.equals("age") )
{
insideAgeElement = false;
}
try
{
out.write(++stepCount + ". End of element <b>" + qName + "</b><br>");
}
catch (IOException e)
{
throw new SAXException(e);
} // end of try-catch
} // end of endElement()
public void characters(char[] chars, int start, int length) throws SAXException
{
String content = new String(chars, start, length);
if ( insideAgeElement )
{
int age = Integer.parseInt(content);
totalAge += age;
}
try
{
out.write(++stepCount + ". Character content = ");
if ( length > 0 )
out.write("<b>" + content + "</b><br>");
}
catch (IOException e)
{
throw new SAXException(e);
} // end of try-catch
} // end of characters()
} // end of class MyHandler
