责任链模式

 

这是一个过滤消息的例子。

==========================

package com.fullwisdom.moden.chain;

public class Message {
    private String content;

    public String getContent() {
         return content;
    }

    public void setContent(String content) {
          this.content = content;
    }

｝

=========================

package com.fullwisdom.moden.chain;

public interface Handler {
      public Message doFilter(Message message);
}

 

=========================

 

package com.fullwisdom.moden.chain;

public class HTMLHandler implements Handler {

   @Override
    public Message doFilter(Message message) {
  
    String msg = message.getContent();
  
    msg = msg.replaceAll("<", "&lt;");
    msg = msg.replaceAll(">", "&gt;");
    message.setContent(msg);
    return message;
 }
}

 

==============================

package com.fullwisdom.moden.chain;

public class SensitiveHandler implements Handler {

      @Override
      public Message doFilter(Message message) {
           String msg = message.getContent().replaceAll("我日", "**").replaceAll("我操", "**");
           message.setContent(msg);
           return message;
    }

}

 

=================================

package com.fullwisdom.moden.chain;

import java.util.ArrayList;
import java.util.List;

public class Chain implements Handler {

      List<Handler> list = new ArrayList<Handler>();
      public void addHandler(Handler handler){
          this.list.add(handler);
       }
 
    @Override
    public Message doFilter(Message message) {
        for(Handler h :list)
            message = h.doFilter(message);
         return message;
    }
}

 

 ===============================

 

public class Main{

     public stiatic void main(String[] args){

          String content = "<H1>我日</H1><H1>我日</H1><H1>我日</H1><H1>我操 hello   。。 fuck</H1><H1>我日</H1>";
      Message message= new Message();
      message.setContent(content);
  
      HTMLHandler htmlHandler = new HTMLHandler();
      SensitiveHandler sensitiveHanler  = new SensitiveHandler();
  
      Chain chain = new Chain();
      chain.addHandler(htmlHandler);
      chain.addHandler(sensitiveHanler);
  
         message = chain.doFilter(message);
  
         System.out.println(message.getContent());

     }

}