addressbookreader02.java

《j2ee经典实例详解》的源代码。原书无附带光盘。介绍的是一个在线银行系统的例子。绝对难得

/*
 * Copyright (c) 2005 Sun Microsystems, Inc.  All rights reserved.  U.S.
 * Government Rights - Commercial software.  Government users are subject
 * to the Sun Microsystems, Inc. standard license agreement and
 * applicable provisions of the FAR and its supplements.  Use is subject
 * to license terms.
 *
 * This distribution may include materials developed by third parties.
 * Sun, Sun Microsystems, the Sun logo, Java and J2EE are trademarks
 * or registered trademarks of Sun Microsystems, Inc. in the U.S. and
 * other countries.
 *
 * Copyright (c) 2005 Sun Microsystems, Inc. Tous droits reserves.
 *
 * Droits du gouvernement americain, utilisateurs gouvernementaux - logiciel
 * commercial. Les utilisateurs gouvernementaux sont soumis au contrat de
 * licence standard de Sun Microsystems, Inc., ainsi qu'aux dispositions
 * en vigueur de la FAR (Federal Acquisition Regulations) et des
 * supplements a celles-ci.  Distribue par des licences qui en
 * restreignent l'utilisation.
 *
 * Cette distribution peut comprendre des composants developpes par des
 * tierces parties. Sun, Sun Microsystems, le logo Sun, Java et J2EE
 * sont des marques de fabrique ou des marques deposees de Sun
 * Microsystems, Inc. aux Etats-Unis et dans d'autres pays.
 */


import java.io.*;
import org.xml.sax.*;
import org.xml.sax.helpers.AttributesImpl;


/**
 * AddressBookReader -- an application that reads an address book file
 * exported from Netscape Messenger using the Line Delimited Interchange
 * Format (LDIF).
 * <p>
 * LDIF address book files have this format:<pre>
 *   dn: cn=FirstName LastName,mail=emailAddress
 *   modifytimestamp: 20010328014700Z
 *   cn: FirstName LastName  --display name (concatenation of givenname+sn)
 *   xmozillanickname: Fred        --------+
 *   mail: fred                            |
 *   xmozillausehtmlmail: TRUE             +-- We care about these
 *   givenname: Fred                       |
 *   sn: Flintstone   --(surname)          |
 *   telephonenumber: 999-Quarry           |
 *   homephone: 999-BedrockLane            |
 *   facsimiletelephonenumber: 888-Squawk  |
 *   pagerphone: 777-pager                 |
 *   cellphone: 666-cell           --------+
 *   xmozillaanyphone: Work#
 *   objectclass: top
 *   objectclass: person
 * </pre>
 *
 * @author Eric Armstrong
 */
public class AddressBookReader02 implements XMLReader {
    ContentHandler handler;

    // We're not doing namespaces, and we have no
    // attributes on our elements. 
    String nsu = ""; // NamespaceURI
    Attributes atts = new AttributesImpl();
    String rootElement = "addressbook";
    String indent = "\n    "; // for readability!

    /** Parse the input */
    public void parse(InputSource input) throws IOException, SAXException {
        try {
            // Get an efficient reader for the file
            java.io.Reader r = input.getCharacterStream();
            BufferedReader br = new BufferedReader(r);

            // Read the file and display it's contents.
            String line = br.readLine();

            while (null != (line = br.readLine())) {
                if (line.startsWith("xmozillanickname: ")) {
                    break;
                }
            }

            if (handler == null) {
                throw new SAXException("No content handler");
            }

            // Note: 
            // We're ignoring setDocumentLocator(), as well
            handler.startDocument();
            handler.startElement(nsu, rootElement, rootElement, atts);
            output("nickname", "xmozillanickname", line);
            line = br.readLine();
            output("email", "mail", line);
            line = br.readLine();
            output("html", "xmozillausehtmlmail", line);
            line = br.readLine();
            output("firstname", "givenname", line);
            line = br.readLine();
            output("lastname", "sn", line);
            line = br.readLine();
            output("work", "telephonenumber", line);
            line = br.readLine();
            output("home", "homephone", line);
            line = br.readLine();
            output("fax", "facsimiletelephonenumber", line);
            line = br.readLine();
            output("pager", "pagerphone", line);
            line = br.readLine();
            output("cell", "cellphone", line);
            handler.ignorableWhitespace("\n".toCharArray(), 0, // start index
                1 // length
            );
            handler.endElement(nsu, rootElement, rootElement);
            handler.endDocument();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    void output(String name, String prefix, String line)
        throws SAXException {
        int startIndex = prefix.length() + 2; // 2=length of ": " after the name
        String text = line.substring(startIndex);
        int textLength = line.length() - startIndex;
        handler.ignorableWhitespace(indent.toCharArray(), 0, // start index
            indent.length());
        handler.startElement(nsu, name, name /*"qName"*/, atts);
        handler.characters(line.toCharArray(), startIndex, textLength);
        handler.endElement(nsu, name, name);
    }

    /** Allow an application to register a content event handler. */
    public void setContentHandler(ContentHandler handler) {
        this.handler = handler;
    }

    /** Return the current content handler. */
    public ContentHandler getContentHandler() {
        return this.handler;
    }

    //=============================================
    // IMPLEMENT THESE FOR A ROBUST APP
    //=============================================

    /** Allow an application to register an error event handler. */
    public void setErrorHandler(ErrorHandler handler) {
    }

    /** Return the current error handler. */
    public ErrorHandler getErrorHandler() {
        return null;
    }

    //=============================================
    // IGNORE THESE
    //=============================================   

    /** Parse an XML document from a system identifier (URI). */
    public void parse(String systemId) throws IOException, SAXException {
    }

    /** Return the current DTD handler. */
    public DTDHandler getDTDHandler() {
        return null;
    }

    /** Return the current entity resolver. */
    public EntityResolver getEntityResolver() {
        return null;
    }

    /** Allow an application to register an entity resolver. */
    public void setEntityResolver(EntityResolver resolver) {
    }

    /** Allow an application to register a DTD event handler. */
    public void setDTDHandler(DTDHandler handler) {
    }

    /** Look up the value of a property. */
    public Object getProperty(String name) {
        return null;
    }

    /** Set the value of a property. */
    public void setProperty(String name, Object value) {
    }

    /** Set the state of a feature. */
    public void setFeature(String name, boolean value) {
    }

    /** Look up the value of a feature. */
    public boolean getFeature(String name) {
        return false;
    }
}