浅谈模式 - 责任链模式

过滤器链，拦截器链

public interface IHandler {

    boolean doIt();
}
public class Handler1 implements IHandler {

    @Override
    public boolean doIt() {
        System.out.println("handler 1");
        return true;
    }
}
public class Handler2 implements IHandler {

    @Override
    public boolean doIt() {
        System.out.println("handler 2");
        return true;
    }
}
public class HandlerChain {

    private List<IHandler> handlers = new ArrayList<>();

    public void addHandler(IHandler handler) {
        handlers.add(handler);
    }

    public void doHandlers() {
        for (IHandler handler : handlers) {
            boolean res = handler.doIt();
            if (!res) {
                break;
            }
        }
    }
}
public class Client {

    public static void main(String[] args) {
        HandlerChain handlerChain = new HandlerChain();
        handlerChain.addHandler(new Handler1());
        handlerChain.addHandler(new Handler2());
        handlerChain.doHandlers();
    }
}

树下应用，挺多的。

① Struts2的过滤器链

② Java web的过滤器链

③ SpringMVC的拦截器链

④ Dubbo的过滤器链 参考文档 dubbo的filterhttps://blog.csdn.net/wjlucky262/article/details/105907579)

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