责任链模式

class filterChain{
    private List<Filter> filters;
    public void addFilter(Filter filter){
         filters.add(filter);
    }
    public void do(HttpRequest request){
         for(Filter filter:filters){
              filter.do(request);
         }
    }
}
 
public class ConcreateFilter1:Filter{
      public void do(HttpRequest request){
          //
      }
}
 
public class ConcreateFilter2:Filter{
      public void do(HttpRequest request){
          //
      }
}
 
public class  Client{
      public void main(String[] args){
 
            HttpRequest request = .....
            FilterChain filterChain = new FilterChain();
            filterChain.addFilter(new ConcreateFilter1());
            filterChain.addFilter(new ConcreateFilter2());
            filterChain.addFilter(new ConcreateFilter2());
            filterChain.do(request);
      }
}