UserDirectory.java
/*
* $Header: /home/cvspublic/jakarta-struts/src/example/org/apache/struts/example/LogoffAction.java,v 1.4 2000/09/23 22:53:53 craigmcc Exp $
* $Revision: 1.4 $
* $Date: 2000/09/23 22:53:53 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email removido].
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
/**
* Implementation of <strong>Action</strong> that validates a user
* logon.
* <p>
* :TODO: Javadocs.
*
* @todo Javadocs
* @author George Franciscus
* @version $Revision: $ $Date: $
*/
package app;
import java.io.IOException;
import java.io.InputStream;
import java.io.FileOutputStream;
import java.util.Enumeration;
import java.util.Properties;
import java.net.URL;
public class UserDirectory {
/**
*
*/
private static final String UserDirectoryFile =
"resources/users.properties";
/**
*
*/
private static final String UserDirectoryHeader =
"${user}=${password}";
/**
*
*/
private static UserDirectory userDirectory = null;
/**
*
*/
private static Properties p;
/**
*
*/
private UserDirectory() throws UserDirectoryException {
java.io.InputStream i = null;
p = null;
i = this.getClass().getClassLoader().
getResourceAsStream(UserDirectoryFile);
if (null==i) {
throw new UserDirectoryException();
}
else {
try {
p = new Properties();
p.load(i);
i.close();
}
catch (java.io.IOException e) {
p = null;
System.out.println(e.getMessage());
throw new UserDirectoryException();
}
finally {
i = null;
}
} // end else
} // end UserDirectory
/**
*
*/
public static UserDirectory getInstance() throws
UserDirectoryException {
if (null==userDirectory) {
userDirectory = new UserDirectory();
}
return userDirectory;
}
/**
* Transform id so that it will match any conventions used by user
* directory. The default implementation forces the id to
* uppercase. Does <b>not</b> expect the userId to be null and
* will throw a NPE if it is.
*
* @exception Throws Null Pointer Exception if userId is null.
*/
public String fixId(String userId) {
return userId.toUpperCase();
}
/**
*
*/
public boolean isValidPassword(String userId, String password) {
// no null passwords
if (null==password) return false;
// conform userId to uppercase
String _userId = fixId(userId);
// no passwords for non-users
if (!isUserExist(_userId)) return false;
// does password match user's password
return (password.equals(getPassword(_userId)));
}
/**
*
*/
public boolean isUserExist(String userId) {
// no null users
if (null==userId) return false;
// if not null, it's a user
return !(null==p.getProperty(userId));
}
/**
*
*/
public String getPassword(String userId) {
return p.getProperty(userId);
}
/**
*
*/
public Enumeration getUserIds() {
return p.propertyNames();
}
/**
*
*/
public void setUser(String userId, String password) throws
UserDirectoryException {
// no nulls
if ((null==userId) || (null==password)) {
throw new UserDirectoryException();
}
try {
// conform userId to uppercase when stored
p.put(fixId(userId), password);
String o = this.getClass().getClassLoader().getResource(UserDirectoryFile).getFile();
p.store(new FileOutputStream(o), UserDirectoryHeader);
}
catch (IOException e) {
throw new UserDirectoryException();
}
}
} // end UserDirectory
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<!-- Action Servlet Configuration -->
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>validate</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<!-- Action Servlet Mapping -->
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<!-- Struts Tag Library Descriptors -->
<taglib>
<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>
</web-app>
No livro deve ter um site q contem os fontes 
