责任链模式如何在Java项目中实现

public final class ApplicationFilterChain implements FilterChain {  private int pos = 0; //当前执行filter的offset  private int n; //当前filter的数量  private ApplicationFilterConfig[] filters; //filter配置类，通过getFilter()方法获取Filter  private Servlet servlet  @Override  public void doFilter(ServletRequest request, ServletResponse response) {    if (pos < n) {      ApplicationFilterConfig filterConfig = filters[pos++];      Filter filter = filterConfig.getFilter();      filter.doFilter(request, response, this);    } else {      // filter都处理完毕后，执行servlet      servlet.service(request, response);    }  }}