责任链设计模式Demo

  实现功能：请假审批流程，请假3天以内，主任审批；请假3-10天，经理审批；请假10天以上，总经理审批。

1.定义一个请假请求LeaveRequest的类。

public class LeaveRequest {
        private String name;//请假人姓名
        private int days;//请假天数
        private String reason;//请假原因

        public LeaveRequest(String name, int days, String reason) {
            this.name = name;
            this.days = days;
            this.reason = reason;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getDays() {
            return days;
        }

        public void setDays(int days) {
            this.days = days;
        }

        public String getReason() {
            return reason;
        }

        public void setReason(String reason) {
            this.reason = reason;
        }
    }

2.定义一个Leader的抽象类，有一个上级领导的nextLeader属性，还有一个处理请假请求handleRequest()的方法

public abstract class Leader {
    protected String name;
    protected Leader nextLeader;//责任链后期对象
    public Leader(){

    }

    public Leader(String name){
        super();
        this.name=name;
    }

    public void setNextLeader(Leader nextLeader) {
        this.nextLeader = nextLeader;
    }

    //处理请求核心业务方法
    public abstract void handleRequest(LeaveRequest leaveRequest);
}

3.定义一个Director的子类，重写父类方法，3天以内主任处理，3天以上，交给上级领导

public class Director extends Leader {

    public Director(String name){
        super(name);
    }
    @Override
    public void handleRequest(LeaveRequest leaveRequest) {
        if (leaveRequest.getDays()<3){
            //处理
            System.out.println("主任审批通过...");
        }else {
            //处理不了，给下处理
            this.nextLeader.handleRequest(leaveRequest);
        }
    }
}

4.同理，Manager类只处理3-10天的请假。

public class Manager extends Leader{
    public Manager(String name){
        super(name);
    }
    @Override
    public void handleRequest(LeaveRequest leaveRequest) {
        if (leaveRequest.getDays()>3&&leaveRequest.getDays()<=10){
            System.out.println("经理审批成功");
        }else {
            this.nextLeader.handleRequest(leaveRequest);
        }
    }
}

5.GeneralMmanger类处理10天以上的请假

public class GeneralManager extends Leader {
    public GeneralManager(String name){
        super(name);
    }
    @Override
    public void handleRequest(LeaveRequest leaveRequest) {
        if (leaveRequest.getDays()<30){
            System.out.println("总经理审批通过...");
        }else {
            System.out.println(leaveRequest.getName()+":想辞职吧!");
        }
    }
}

6.测试类代码

public class Main {

    public static void main(String[] args) {
        Director director = new Director("主任");
        Manager manager = new Manager("经理");
        GeneralManager generalManager = new GeneralManager("总经理");
        director.setNextLeader(manager);
        manager.setNextLeader(generalManager);
        LeaveRequest leaveRequest = new LeaveRequest("洪昶", 1, "面试");
        director.handleRequest(leaveRequest);
    }
}

7.结果展示