类似实现filter的责任链形式

模式的定义与特点 责任链（Chain of Responsibility）模式的定义：为了避免请求发送者与多个请求处理者耦合在一起，于是将所有请求的处理者通过前一对象记住其下一个对象的引用而连成一条链；当有请求发生时，可将请求沿着这条链传递，直到有对象处理它为止。

package com.study.design.chain;

import java.util.LinkedList;
import java.util.List;

/**
 * @author fangdayang
 * @Package com.study.design.chain
 * @date 2021/2/14 9:31
 */
public class Servlet_Main {
          
   
    public static void main(String[] args) {
          
   
        Request request = new Request();
        request.resquest="大家好:)，<script>，欢迎访问 zhushanshan.com ，大家都是996 ";
        Response response = new Response();
        response.response="response:";
        new FilterChain()
                .add(new HtmlFilter())
                .add(new UrlFIlter())
                .doFilter(request,response);
        System.out.println(request.resquest);
        System.out.println(response.response);

    }
}

interface Filter {
          
   
    void doFilter(Request request, Response response, FilterChain chain);
}

class Request {
          
   
    String resquest;
}

class Response {
          
   
    String response;
}

class HtmlFilter implements Filter {
          
   
    @Override
    public void doFilter(Request request, Response response, FilterChain chain) {
          
   
        request.resquest.replace("<","[").replace(">","]");
        request.resquest=request.resquest+"HtmlFilter->";
        chain.doFilter(request,response);
        response.response=response.response+"HtmlFilter->";
    }
}

class UrlFIlter implements Filter {
          
   

    @Override
    public void doFilter(Request request, Response response, FilterChain chain) {
          
   
         request.resquest.replace("zhushanshan.com","www.zhushanshan.com");
         request.resquest=request.resquest+"UrlFIlter->";
         chain.doFilter(request,response);
         response.response=response.response+"UrlFIlter->";
    }

}

class FilterChain {
          
   
    public static List<Filter> filterList = new LinkedList<>();
    int index = 0;
    public FilterChain add(Filter filter){
          
   
        filterList.add(filter);
        return this;
    }

    public void doFilter(Request request, Response response) {
          
   
        if (index==filterList.size()) return;
        Filter filter = filterList.get(index);
        index++;
        filter.doFilter(request, response, this);
    }

}