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The source code
/**
* CSMailForm.java
*
* Bill Lynch
* CoolServlets.com
* April 21 1999
*
* CSMailForm Version 1.1
*
* Copyright (C) 1999 Bill Lynch
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.net.*;
import java.util.*;
import com.coolservlets.*;
import com.coolservlets.email.*;
/**
* This is a servlet that takes input from HTML forms and sends an
* email with the given information. It uses the CSEmail package 1.1
*
* @author Bill Lynch
* @version 1.1
*/
public class CSMailForm extends HttpServlet
{
/**
* Initialize global variables
*/
public void init( ServletConfig config ) throws ServletException
{
super.init( config );
propertiesLoaded = false;
}
/**
* Process the HTTP Get request
*/
public void doGet( HttpServletRequest req, HttpServletResponse res ) throws ServletException, IOException
{ doPost( req, res );
}
/**
* Process the HTTP Post request
*/
public void doPost( HttpServletRequest req, HttpServletResponse res ) throws ServletException, IOException
{
boolean error=false, doProps=false;
res.setContentType( "text/html" );
PrintWriter out = res.getWriter();
// Check to see if the properties are loaded. If not, load them.
// This also checks for errors (ie, if the property file is not there).
if( !propertiesLoaded )
{ propertiesLoaded = true;
try
{ MailFormProperties = readProperties();
smtpHost = getProperty( "smtpServer" );
smtpPort = Integer.parseInt( getProperty( "smtpPort" ) );
} catch( IOException ioe )
{ propertiesLoaded = false;
error = true;
out.println( "Error reading properties.<br>This error will be resolved as soon as possible." );
}
}
// Check to see if the servlet has been called with no parameters:
if( !error )
{ Enumeration enum = req.getParameterNames();
if( !enum.hasMoreElements() )
{ error = true;
printError( out, "<html>\n"
+ "Error: no parameters were given." );
}
}
// Check if we need to reload or display the properties:
if( !error )
{ String props = req.getParameter( "properties" );
if( props != null )
{ if( props.toLowerCase().compareTo( "reload" ) == 0 )
{ doProps = true;
try
{ MailFormProperties = readProperties();
smtpHost = getProperty( "smtpServer" );
smtpPort = Integer.parseInt( getProperty( "smtpPort" ) );
} catch( IOException ioe )
{ out.println( "Error reading properties" );
error = true;
}
out.println( "<html>\n"
+ "Properties reloaded successfully.<br>"
+ "To display your properties, use the argument: <b>CSMailForm?properties=display" );
}
else if( props.toLowerCase().compareTo( "display" ) == 0 )
{ doProps = true;
String allowPropsDisplay = null;
try
{ allowPropsDisplay = getProperty( "displayProperties" );
} catch( IOException ioe )
{ out.println( "Unable to read from properties file. Please try again.<br>" );
}
if( allowPropsDisplay != null && allowPropsDisplay.toLowerCase().compareTo( "yes" ) == 0 )
{ out.println( "<font face=\"arial,helvetica\">Your CSMailForm Properties:
" );
Enumeration name = MailFormProperties.propertyNames();
Enumeration vals = MailFormProperties.elements();
out.println( "<ul>" );
while( name.hasMoreElements() )
{ out.println( "<li>" + "" + (String)name.nextElement() + "" + " = "
+ (String)vals.nextElement()
+ "<br>" );
}
out.println( "</ul>" );
}
else
{ out.println( "<html>\n"
+ "Sorry, the administrator of this servlet has disallowed "
+ "viewing of the properties." );
}
}
}
}
if( !error && !doProps )
{ // Check to see if the referrer is valid
boolean refererOk = true;
String httpReferer = req.getHeader( "Referer" );
String allowedRemoteHost = null;
try
{ allowedRemoteHost = getProperty( "validHostName" );
} catch( IOException ioe )
{ out.println( "Error reading properties." );
}
if( httpReferer != null )
{ URL u = new URL( httpReferer );
if( u.getHost().compareTo( allowedRemoteHost ) != 0 )
refererOk = false;
}
if( !refererOk )
{ out.println( "<html>"
+ "Error invalid host referrer.<br>" );
}
else
{ // Get the parameters
String to = req.getParameter( "to" );
String toName = req.getParameter( "toName" );
String toEmail = req.getParameter( "toEmail" );
String fromName = req.getParameter( "fromName" );
String fromEmail = req.getParameter( "fromEmail" );
String cc = req.getParameter( "cc" );
String bcc = req.getParameter( "bcc" );
String required = req.getParameter( "required" );
String timestamp = req.getParameter( "timestamp" );
String redirect = req.getParameter( "redirect" );
String subject = req.getParameter( "subject" );
String message = req.getParameter( "message" );
String response = req.getParameter( "response" );
String title = req.getParameter( "title" );
String fontFace = req.getParameter( "fontFace" );
String fontSize = req.getParameter( "fontSize" );
String linkBack = req.getParameter( "linkBack" );
String textBack = req.getParameter( "textBack" );
String background = req.getParameter( "background" );
String bgcolor = req.getParameter( "bgcolor" );
String text = req.getParameter( "text" );
String link = req.getParameter( "link" );
String vlink = req.getParameter( "vlink" );
String alink = req.getParameter( "alink" );
String reqError = req.getParameter( "reqError" );
String onErrorPg = req.getParameter( "onErrorPage" );
// Add a timestamp if so desired...
if( timestamp != null && timestamp.length() > 0 )
if( timestamp.toLowerCase().compareTo( "yes" ) == 0 )
message = "This message was sent on: " + (new Date()) + "\n\n" + message;
// Check that the required fields have actually been filled out
Vector errors = new Vector();
boolean fieldErrors = false;
if( required != null )
fieldErrors = checkRequiredFields( required, req, errors );
// If there are errors, print them out.
if( fieldErrors )
{ if( reqError == null )
{ reqError = "<html>"
+ "<font face=\"arial,helvetica\">"
+ "Oops! You forgot to fill in the following fields:"
+ "</b>";
}
out.println( reqError );
out.println( "<ul>" );
for( int i=0; i<errors.size(); i++ )
out.println( "<li>" + (String)errors.elementAt(i) );
out.println( "</ul>" );
}
else // no errors, so continue
{ // Create message and transport objects:
Message msg = new Message();
Transport tr = new Transport( smtpHost, smtpPort );
// Now check for a redirect
boolean wasRedirect = false;
if( redirect != null && redirect.length() > 0 )
wasRedirect = true;
// Add cc, bcc and to lists (comma-delimited strings of
// names and/or email addresses
if( to != null && to.length() > 0 )
{ Address[] toAddr = Address.parse( to );
msg.setRecipients( RecipientType.TO, toAddr );
}
else if( toEmail != null && toEmail.length() > 0 )
{ if( toName != null && toName.length() > 0 )
msg.setRecipient( RecipientType.TO, new Address( toName, toEmail ) );
else
msg.setRecipient( RecipientType.TO, new Address( toEmail ) );
}
if( cc != null && cc.length() > 0 )
{ Address[] ccAddr = Address.parse( cc );
msg.setRecipients( RecipientType.CC, ccAddr );
}
if( bcc != null && bcc.length() > 0 )
{ Address[] bccAddr = Address.parse( bcc );
msg.addRecipients( RecipientType.BCC, bccAddr );
}
// Set the rest of the details of the message
if( ( fromName != null && fromName.length() > 0 ) &&
( fromEmail!= null && fromEmail.length()> 0 ) )
msg.setFrom( new Address( fromName, fromEmail ) );
else
if( fromEmail != null && fromEmail.length() > 0 )
msg.setFrom( new Address( fromEmail ) );
// Set the subject
if( subject != null && subject.length() > 0 )
msg.setSubject( subject );
// Set the message text
if( message != null && message.length() > 0 )
msg.setText( message );
// Send the email!
boolean sendError = false;
try
{ tr.send( msg );
}
catch( TransportException te )
{ out.println( "<p>" + te + "" );
sendError = true;
}
catch( Exception e )
{ out.println( "exception e: " + e + "<p>" );
}
// Check if there were sending errors... If so, print them
if( wasRedirect && !sendError )
res.sendRedirect( redirect );
if( sendError )
{ if( onErrorPg != null && onErrorPg.length() > 0 )
res.sendRedirect( onErrorPg );
else
{
out.println( "<font face=\"arial,helvetica\">"
+ "Sorry, we're unable to send the email right now.<br>
"
+ "Please try again later or contact the system administrator."
+ "</b>" );
}
}
else
{ // Here's where the return page is constructed:
// Default styles will be used if none are specified through parameters
if( response == null ) response = "Thank you for your feedback!";
if( title == null ) title = "Thanks!";
if( fontFace == null ) fontFace = "arial,helvetica";
if( fontSize == null ) fontSize = "3";
if( linkBack == null ) linkBack = "http://www.coolservlets.com/";
if( textBack == null ) textBack = "Go Back";
if( background == null ) background = "";
if( bgcolor == null ) bgcolor = "#ffffff";
if( text == null ) text = "#000000";
if( link == null ) link = "#0000ff";
if( vlink == null ) vlink = "#800080";
if( alink == null ) alink = "#ff0000";
out.println( "<html>" );
out.println( "<head>" + title + "" );
// use buffers for a little more string efficiency
StringBuffer body = new StringBuffer();
body.append( "<body background=\""+background+"\" " );
body.append( "bgcolor=\""+bgcolor+"\" " );
body.append( "text=\""+text+"\" " );
body.append( "link=\""+link+"\" " );
body.append( "vlink=\""+vlink+"\" " );
body.append( "alink=\""+alink+"\">" );
out.println( body.toString() ); // now BODY tag is out the door
out.println( "<font face=\""+fontFace+"\" size="+fontSize+">" );
out.println( response );
out.println( "<p>
" );
out.println( "<a href=\""+linkBack+"\">"+textBack+"" );
}
} //else from field error check
} // if from ok host
} // if from !error
out.println( "</body>" );
out.println( "</html>" );
out.close( );
}
/**
* Checks required fields by looping through the list of specified fields
* and checks them against what was actually submitted.
*/
private boolean checkRequiredFields( String s, HttpServletRequest req, Vector errorsVec )
{ boolean errors=false;
StringTokenizer st = new StringTokenizer( s, "," );
String tok="";
while( st.hasMoreTokens() )
{ tok = st.nextToken();
if( req.getParameter( tok ) == null || req.getParameter( tok ).length() == 0 )
{ errorsVec.addElement( tok );
errors=true;
}
}
return errors;
}
/**
* Reads the properties file.
*/
private synchronized Properties readProperties() throws IOException
{ Properties tempProperties = new Properties();
FileInputStream in = new FileInputStream("coolservlets/config/MailFormProperties");
tempProperties.load(in);
return tempProperties;
}
/**
* Returns specified property
*/
private String getProperty( String prop ) throws IOException
{ return ( MailFormProperties.getProperty( prop ) );
}
/**
*
*/
private void printError( PrintWriter out, String msg )
{ out.print( msg );
}
/**
* Get Servlet information
*/
public String getServletInfo()
{ return "CSMailForm - A servlet to send email throught HTML forms.";
}
private StringTokenizer st;
private String token = "";
private Properties MailFormProperties;
private String smtpHost;
private int smtpPort;
private boolean propertiesLoaded;
}
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