设计模式之原型模式

/**
 * 广告信模板代码
 *
 */
public class AdvTemplate {
    
    //广告信名称
    private String advSubject = "XX银行国庆信用卡抽奖活动";
    //广告信内容
    private String advContext = "国庆抽奖活动通知： 只要刷卡就送你一百万！ ...";
    //取得广告信的名称
    public String getAdvSubject(){
        return this.advSubject;
    }
    //取得广告信的内容
    public String getAdvContext(){
        return this.advContext;
    }
}

/**
 * 邮件类代码
 *
 */
public class Mail implements Cloneable {

    //收件人
    private String receiver;
    //邮件名称
    private String subject;
    //称谓
    private String appellation;
    //邮件内容
    private String contxt;
    //邮件的尾部， 一般都是加上"XXX版权所有"等信息
    private String tail;
    //构造函数
    public Mail(AdvTemplate advTemplate){
        this.contxt = advTemplate.getAdvContext();
        this.subject = advTemplate.getAdvSubject();
    }
    
    @Override
    protected Mail clone() {
        Mail mail = null;
        try {
            mail = (Mail) super.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return mail;
    }

    public String getReceiver() {
        return receiver;
    }
    public void setReceiver(String receiver) {
        this.receiver = receiver;
    }
    public String getSubject() {
        return subject;
    }
    public void setSubject(String subject) {
        this.subject = subject;
    }
    public String getAppellation() {
        return appellation;
    }
    public void setAppellation(String appellation) {
        this.appellation = appellation;
    }
    public String getContxt() {
        return contxt;
    }
    public void setContxt(String contxt) {
        this.contxt = contxt;
    }
    public String getTail() {
        return tail;
    }
    public void setTail(String tail) {
        this.tail = tail;
    }
}

/**
 * 场景类
 *
 */
public class Client {

    //发送账单的数量， 这个值是从数据库中获得
    private static int MAX_COUNT = 6;
    public static void main(String[] args) {
        //模拟发送邮件
        int i=0;
        //把模板定义出来， 这个是从数据库中获得
        Mail mail = new Mail(new AdvTemplate());
        mail.setTail("XX银行版权所有");
        while(i < MAX_COUNT){
            //以下是每封邮件不同的地方
            /*mail.setAppellation(getRandString(5) + " 先生（ 女士） ");
            mail.setReceiver(getRandString(5) + "@" + getRandString(8) + ".com");*/
            Mail cloneMail = mail.clone();
            cloneMail.setAppellation(getRandString(5) + " 先生（ 女士） ");
            cloneMail.setReceiver(getRandString(5) + "@" + getRandString(8) + ".com");
            //然后发送邮件
            sendMail(cloneMail);
            i++;
        }
    }
    //发送邮件
    public static void sendMail(Mail mail){
        System.out.println("标题： " + mail.getSubject() + "\t收件人：" + 
                mail.getReceiver() + "\t...发送成功！ ");
    }
    //获得指定长度的随机字符串
    public static String getRandString(int maxLength){
        String source ="abcdefghijklmnopqrskuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        StringBuffer sb = new StringBuffer();
        Random rand = new Random();
        for(int i = 0; i < maxLength; i++){
            sb.append(source.charAt(rand.nextInt(source.length())));
        }
        return sb.toString();
    }
}