从任意数据结构生成XML解析器产生SAX事件

    public ErrorHandler getErrorHandler() {
        return null;
    }

    public boolean getFeature(String name) throws SAXNotRecognizedException,
            SAXNotSupportedException {
        return false;
    }

    public Object getProperty(String name) throws SAXNotRecognizedException,
            SAXNotSupportedException {
        return null;
    }

    public void setContentHandler(ContentHandler handler) {
        this.handler = handler;
    }

    public void setDTDHandler(DTDHandler handler) {
    }

    public void setEntityResolver(EntityResolver resolver) {
    }

    public void setErrorHandler(ErrorHandler handler) {
    }

    public void setFeature(String name, boolean value) throws
            SAXNotRecognizedException, SAXNotSupportedException {
    }

    public void setProperty(String name, Object value) throws
            SAXNotRecognizedException, SAXNotSupportedException {
    }

    void output(String name, String line) throws SAXException {
        int tmp = name.length();
        int startIndex=tmp+1;
        int textLength = line.length() - startIndex;
        String characters = line.substring(startIndex,line.length()-1);
        handler.ignorableWhitespace(indent.toCharArray(), 0, // start index
                                    indent.length());
        handler.startElement(nsu, name, name /*"qName"*/, atts);

        handler.characters(characters.toCharArray(), startIndex, textLength);
        handler.endElement(nsu, name, name);
    }

}

具体观察者对象: ConcreateObserver类
package test;

import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.*;
public class ConcreateObserver extends DefaultHandler {
    public ConcreateObserver() {
    }

    public void startElement(String uri,
                         String localName,
                         String qName,
                         Attributes attributes)
                  throws SAXException{
              System.out.println("startElement: "+localName);
          }
          public void characters(char[] ch,
                                 int start,
                                 int length)
                throws SAXException{
            System.out.println("characters: ");
            System.out.print(ch);
            System.out.println();
        }
}

测试类:TestMain
package test;
import java.io.*;
import org.xml.sax.InputSource;
public class TestMain {
    public TestMain() {
    }

    public static void main(String[] args) throws Exception {
        TestMain testmain = new TestMain();
        FileReader in = new FileReader(new File("d:\\AddressBookReaderLog01.txt"));

        ConcreateObserver observer=new ConcreateObserver();
        ParseXMLSubject parse = new ParseXMLSubject();
        parse.setContentHandler(observer);

        parse.parse(new InputSource(in));
    }
}

测试文本文档:AddressBookReaderLog01.txt

AddressBookReader01 ../samples/PersonalAddressBook.ldif
nickname: Fred
email: fred@barneys.house
html: TRUE
firstname: Fred
lastname: Flintstone
work: 999-Quarry
home: 999-BedrockLane
fax: 888-Squawk
pager: 777-pager
cell: 555-cell

另外一个也比较也有意思的地方就是具体观察者类从DefaultHandler 继承,该类是缺省适配器模式的应用.

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