八、AbstractFactory 抽象工厂模式

设计原理:

代码清单：

抽象 Factory ：

 1 public abstract class Factory {
 2     public static Factory getFactory(String classname){
 3         Factory factory = null;
 4         try {
 5             factory = (Factory) Class.forName(classname).newInstance();
 6         }catch (ClassNotFoundException e){
 7             e.printStackTrace();
 8         }catch (Exception e){
 9             e.printStackTrace();
10         }
11         return factory;
12     }
13     public abstract  Link creatLink(String caption,String url);
14     public abstract  Tray createTray(String caption);
15     public abstract  Page createPage(String title,String author);
16 }

抽象 Item ：

public abstract class Item {
    protected  String caption;
    public  Item(String caption){
        this.caption=caption;
    }
    public abstract  String makeHTML();
}

抽象Link ：

public abstract class Link extends Item{
    protected  String url;
    public Link(String caption,String url){
        super(caption);
        this.url=url;
    }
}

抽象 Page:

public abstract class Page {
    protected String title;
    protected String author;
    protected ArrayList content = new ArrayList();
    public Page(String title,String author){
        this.title=title;
        this.author=author;
    }

    public void add(Item item){
        content.add(item);
    }

    public void output(){
        try {
            String filename = title + ".html";
            Writer writer = new FileWriter("d:/"+filename);
            writer.write(this.makeHTML());
            writer.close();
            System.out.println(filename + "编写完成");
        }catch (IOException e){
            e.printStackTrace();
        }
    }

    public abstract  String makeHTML();
}

抽象 Tray:

public abstract class Tray extends  Item{
    protected ArrayList tray = new ArrayList();
    public Tray(String caption){
        super(caption);
    }
    public  void add(Item item){
        tray.add(item);
    }
}

实现：

ListFactory:

public class ListFactory extends Factory{
    @Override
    public Link creatLink(String caption, String url) {
        return new ListLink(caption,url);
    }

    @Override
    public Tray createTray(String caption) {
        return new ListTray(caption);
    }

    @Override
    public Page createPage(String title, String author) {
        return new ListPage(title,author);
    }
}

ListLink

public class ListLink extends Link{
    public ListLink(String caption,String url){
        super(caption,url);
    }

    @Override
    public String makeHTML() {
        return "<li><a>"+url+","+caption+"</a></li>\n";
    }
}

ListPage

public class ListPage extends Page{

    public ListPage(String title,String author){
        super(title,author);
    }

    @Override
    public String makeHTML() {
        StringBuffer buffer = new StringBuffer();
        buffer.append("<html><head><title>"+title+"</title></head>\n");
        buffer.append("<body>\n");
        buffer.append("<h1>"+title+"</h1>\n");
        buffer.append("<ul>\n");
        Iterator it = content.iterator();
        while(it.hasNext()){
            Item item = (Item) it.next();
            buffer.append(item.makeHTML());
        }
        buffer.append("</ul>\n");
        buffer.append("<hr><address>"+author+"</address>");
        buffer.append("</body></html>\n");
        return buffer.toString();
    }
}

ListTray

public class ListTray extends Tray{
    public ListTray(String caption){
        super(caption);
    }

    @Override
    public String makeHTML() {
        StringBuffer buffer = new StringBuffer();
        buffer.append("<li>\n");
        buffer.append(caption+"\n");
        buffer.append("<ul>\n");
        Iterator it = tray.iterator();
        while (it.hasNext()){
            Item item = (Item)it.next();
            buffer.append(item.makeHTML());
        }
        buffer.append("</ul>\n");
        buffer.append("</li>\n");
        return  buffer.toString();
    }
}

测试类：

public class Main  {
    public static void main(String[] args){
        Factory factory = Factory.getFactory("com.design.abstractFactoryDesign.listfactory.ListFactory");
        Link link = factory.creatLink("人名日报","www.rr.com");
        Tray tray = factory.createTray("日报");
        Page page = factory.createPage("我的人们日报","白壮");

        tray.add(link);
        page.add(tray);
        page.output();

    }
}

结果：生成一个HTML 文件

八、AbstractFactory 抽象工厂模式

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