23种设计模式[4]：建造者模式

//一般情况下，这个类的构造很复杂，或者属性超级多。可组合多种形式的示例
public class Service {

    private String provider;

    private String user;

    private String pwd;

    public String getProvider() {
        return provider;
    }

    public void setProvider(String provider) {
        this.provider = provider;
    }

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    public void sendMsg(String msg) {
        System.out.println("通过" + this.provider + "发送消息:" + msg);
    }
}

public interface Builder {
    void setProvider(String provider);
    void setAccount(String user, String pwd);
    Service getService();
}

public class ConcreteBuilder implements Builder {

    private Service service = new Service();

    @Override
    public void setProvider(String provider){
        this.service.setProvider(provider);
    }

    @Override
    public void setAccount(String user, String pwd) {
        this.service.setUser(user);
        this.service.setUser(pwd);
    }

    @Override
    public Service getService() {
        return this.service;
    }
}

public class Director {
    private Builder builder = new ConcreteBuilder();

    public Service getApnsNoticeService() {
        builder.setProvider("APNS");
        builder.setAccount("notice_apns_user", "notice_apns_pwd");
        return builder.getService();
    }

    public Service getJpushNoticeService() {
        builder.setProvider("极光");
        builder.setAccount("notice_jpush_user", "notice_jpush_pwd");
        return builder.getService();
    }

    public Service getMontnetsSmsService() {
        builder.setProvider("梦网");
        builder.setAccount("sms_montnets_user", "sms_montnets_pwd");
        return builder.getService();
    }

    public Service getEtonenetSmsService() {
        builder.setProvider("移通");
        builder.setAccount("sms_etonenet_user", "sms_etonenet_pwd");
        return builder.getService();
    }
}

public class Client {
    public static void main(String[] args) {
        String msg = "Hello World!";
        Director director = new Director();

        Service apnsNoticeService = director.getApnsNoticeService();
        apnsNoticeService.sendMsg(msg);

        Service jpushNoticeService = director.getJpushNoticeService();
        jpushNoticeService.sendMsg(msg);

        Service montnetsSmsService = director.getMontnetsSmsService();
        montnetsSmsService.sendMsg(msg);

        Service etonenetSmsService = director.getEtonenetSmsService();
        etonenetSmsService.sendMsg(msg);
    }
}