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设计模式-责任链模式

news 2025/7/3 10:51:36

一、所涉及的类

一个抽象接口：里面定义一个该接口的属性next节点，外加set get 方法，以及请求处理方法
N个抽象接口实现类：实现请求处理方法，如果自己能处理则处理，如果处理不了则调用getnext方法调用返回值的请求处理方法
注意：在调用类中创建各个节点，并通过setNext的方式来定义各个节点的顺序，类似于审批流

二、实现代码

抽象接口

public abstract class Approval {private Approval next;public void setNext(Approval next){this.next = next;}public Approval getNext(){return next;}protected abstract void handle(String request);
}

抽象接口实现类1

public class AskApprovalFromBoss extends Approval{@Overrideprotected void handle(String request) {if (request.equals("Ask")){System.out.println("请假老板审批通过");if (getNext() != null ){getNext().handle(request);}else{System.out.println("审批结束");}}else{getNext().handle(request);}}
}

抽象接口实现类2

public class AskApprovalFromLeader extends Approval{@Overrideprotected void handle(String request) {if (request.equals("Ask")){System.out.println("请假组长审批通过");if (getNext() != null ){getNext().handle(request);}else{System.out.println("审批结束");}}else{getNext().handle(request);}}
}

抽象接口实现类3

public class ResignApprovalFromBoss extends Approval{@Overrideprotected void handle(String request) {if (request.equals("Resign")){System.out.println("离职老板审批通过");if (getNext() != null ){getNext().handle(request);}else{System.out.println("审批结束");}}else{getNext().handle(request);}}
}

调用类

public class ChainApplication {public static void main(String[] args) {/*** 改实现是设置了三个审批节点，发起请假的流程，只有 Leader和Boss可以审批，boss的离职审批节点不做处理*/Approval askApprovalFromLeader = new AskApprovalFromLeader();Approval askApprovalFromBoss = new AskApprovalFromBoss();Approval resignApprovalFromBoss = new ResignApprovalFromBoss();askApprovalFromLeader.setNext(resignApprovalFromBoss);resignApprovalFromBoss.setNext(askApprovalFromBoss);askApprovalFromLeader.handle("Ask");}
}