Java implementation of Builder (BUilder) model [00 original]__java

The following examples come from Java and schema.
Suppose there is a system of electronic magazines built in Java that regularly sends electronic magazines to users ' email mailboxes. Users can subscribe through a Web page, or they can end subscriptions through a Web page. When a customer starts a subscription, the system sends an e-mail to welcome it, and when the customer ends the subscription, the system sends an e-mail message saying goodbye. This example is the module that the system is responsible for sending "welcome" and "send-off" messages.
1. Class Diagram

  2. Java Implementation CodePackage cn.edu.ynu.sei.builder;

Import Java.util.Date;
Import java.util.Properties;

Import javax.mail.Session;
Import Javax.mail.Transport;
Import javax.mail.internet.InternetAddress;
Import Javax.mail.internet.MimeMessage;

/**
* Mail Message
*
* @author 88250
* @version 1.0.0, 2007-8-24
*/
Public abstract class Automessage
{
protected String subject = "";
protected String BODY = "";
protected String from = "";
protected String to = "";
protected Date senddate = null;

Public Automessage () {}

public void Send ()
{
Your SMTP server address
String smtphost = "smtp.mycompany.com";

Mail address of Sender
String from = "jeff.yan@mycompany.com";

e-mail address of the person receiving the letter
String to = "ni.hao@yourcompany.com";

Properties Props = new properties ();
Props.put ("Mail.smtp.host", SMTPHost);

Session session = Session.getdefaultinstance (props, null);

Try
{
Internetaddress[] Address = {new internetaddress (to)};
MimeMessage message;

Create a Message Object
message = new MimeMessage (session);
Building a sender's address part
Message.setfrom (New InternetAddress (from));
Building Theme Parts
Message.setsubject ("Hello from Jeff");

Build Send Time part
Message.setsentdate (senddate);

Building Content Parts
Message.settext ("Hello, how are things going?");

Send a message, equivalent to a product reception method
Transport.send (message);
System.out.println ("Email has been sent.");
}
catch (Exception e)
{
E.printstacktrace ();
}
}

/**
* @return The subject
*/
Public String Getsubject ()
{
return subject;
}

/**
* @param subject the subject to set
*/
public void Setsubject (String subject)
{
this. Subject = subject;
}

/**
* @return The body
*/
Public String GetBody ()
{
return to body;
}

/**
* @param body to set
*/
public void Setbody (String body)
{
this. Body = body;
}

/**
* @return the From
*/
Public String Getfrom ()
{
return from;
}

/**
* @param from-to set
*/
public void Setfrom (String from)
{
this. From = from;
}

/**
* @return The Senddate
*/
Public Date getsenddate ()
{
return senddate;
}

/**
* @param senddate the senddate to set
*/
public void Setsenddate (Date senddate)
{
this. senddate = Senddate;
}

/**
* @return The To
*/
Public String Getto ()
{
return to;
}

/**
* @param to the To set
*/
public void Setto (String to)
{
this. to = to;
}
}

Package cn.edu.ynu.sei.builder;

Import Java.util.Date;

/**
* Abstract Builder
*
* @author 88250
* @version 1.0.0, 2007-8-24
*/
Public abstract class Builder
{
protected Automessage msg;

Public Builder () {}

/**
* Theme Parts Construction method
*/
public abstract void Buildsubject ();

/**
* Content Part Construction method
*/
public abstract void Buildbody ();

/**
* Sender Part Construction method
* @param from
*/
public void Buildfrom (String from)
{
Msg.setfrom (from);
}

/**
* Recipient Part Construction method
* @param to
*/
public void Buildto (String to)
{
System.out.println (to);
Msg.setto (to);
}

/**
* Send Time Part construction method
*/
public void Buildsenddate ()
{
Msg.setsenddate (New Date ());
}

/**
* Send mail with this method when the mail product is finished <br>
* This method is equivalent to the product return method
*/
public void SendMessage ()
{
Msg.send ();
}
}

Package cn.edu.ynu.sei.builder;

/**
* Mail Sending system customer
*
* @author 88250
* @version 1.0.0, 2007-8-24
*/
public class Client
{
private static Builder Builder;
private static Director Director;

public static void Main (string[] args)
{
Builder = new Welcomebuilder ();

Director = new Director (builder);
Director.construct ("jeffyan77@yahoo.com", "javapatterns@yahoo.com");
}
}

Package cn.edu.ynu.sei.builder;

/**
* Director Role
*
* @author 88250
* @version 1.0.0, 2007-8-24
*/
public class Director
{
Builder Builder;

Public Director (Builder Builder)
{
this. Builder = Builder;
}

/**
* Product Construction method, responsible for the call of the parts construction method
* @param toaddress
* @param fromaddress
<