职责链模式

实验15：职责链模式

本次实验属于模仿型实验，通过本次实验学生将掌握以下内容： 

1、理解职责链模式的动机，掌握该模式的结构；

2、能够利用职责链模式解决实际问题。

 

[实验任务一]：财务审批

某物资管理系统中物资采购需要分级审批，主任可以审批1万元及以下的采购单，部门经理可以审批5万元及以下的采购单，副总经理可以审批10万元及以下的采购单，总经理可以审批20万元及以下的采购单，20万元以上的采购单需要开职工大会确定。现用职责链模式设计该系统。

实验要求：

1. 提交类图；

 

2. 提交源代码；

public abstract class Leader {

    protected String name;

 

    //上级领导

    protected Leader successor;

 

    public Leader(String name) {

        this.name = name;

    }

 

    public void setSuccessor(Leader successor) {

        this.successor = successor;

    }

 

    protected abstract void handleRequest(ShoppingRequest request);

}

 

 

public class ShoppingRequest {

    private String shoppingReason;

    private double billMoney;

 

    public ShoppingRequest(String shoppingReason,double billMoney){

        this.shoppingReason = shoppingReason;

        this.billMoney = billMoney;

    }

 

    public String getShoppingReason() {

        return shoppingReason;

    }

 

    public void setShoppingReason(String shoppingReason) {

        this.shoppingReason = shoppingReason;

    }

 

    public double getBillMoney() {

        return billMoney;

    }

 

    public void setBillMoney(double billMoney) {

        this.billMoney = billMoney;

    }

}

 

 

public class Client {

    public static void main(String[] args) {

        Leader objDirector,objDepartmentManager,objViceManager,objGeneralManager;

        objDirector = new Director("张主任");

        objDepartmentManager = new DepartmentManager("刘部门经理");

        objViceManager = new ViceManager("王副经理");

        objGeneralManager = new GeneralManager("赵经理");

 

        //设置上级        objDirector.setSuccessor(objDepartmentManager);

        objDepartmentManager.setSuccessor(objViceManager);

        objViceManager.setSuccessor(objGeneralManager);

 

        ShoppingRequest shoppingRequest1 = new ShoppingRequest("买打印纸",1000);

        ShoppingRequest shoppingRequest2 = new ShoppingRequest("购置电脑",20000);

        ShoppingRequest shoppingRequest3 = new ShoppingRequest("购置空调",80000);

        ShoppingRequest shoppingRequest4 = new ShoppingRequest("办公室装修",160000);

        ShoppingRequest shoppingRequest5 = new ShoppingRequest("收购XX公司",1000000);

 

        objDirector.handleRequest(shoppingRequest1);

        System.out.println("****************************************");

        objDirector.handleRequest(shoppingRequest2);

        System.out.println("****************************************");

        objDirector.handleRequest(shoppingRequest3);

        System.out.println("****************************************");

        objDirector.handleRequest(shoppingRequest4);

        System.out.println("****************************************");

        objDirector.handleRequest(shoppingRequest5);

        System.out.println("****************************************");

    }

}

 

 

//主任class Director extends Leader{

    public Director(String name) {

        super(name);

    }

 

    public void handleRequest(ShoppingRequest request){

        if (request.getBillMoney()<10000.00){

            System.out.println(name + "主任处理物资采购" + request.getShoppingReason() + "采购资金为" + request.getBillMoney() + "元");

        } else {

            if (this.successor != null){

                this.successor.handleRequest(request);

            }

        }

    }

}

//部门经理class DepartmentManager extends Leader{

    public DepartmentManager(String name) {

        super(name);

    }

 

    protected void handleRequest(ShoppingRequest request) {

        if (request.getBillMoney()<50000.00){

            System.out.println(name + "部门经理处理物资采购" + request.getShoppingReason() + "采购资金为" + request.getBillMoney() + "元");

        } else {

            if (this.successor != null){

                this.successor.handleRequest(request);

            }

        }

    }

}

//副经理class ViceManager extends Leader{

    public ViceManager(String name) {

        super(name);

    }

 

    @Override

    protected void handleRequest(ShoppingRequest request) {

        if (request.getBillMoney()<100000.00){

            System.out.println(name + "副经理处理物资采购" + request.getShoppingReason() + "采购资金为" + request.getBillMoney() + "元");

        } else {

            if (this.successor != null){

                this.successor.handleRequest(request);

            }

        }

    }

}

//总经理class GeneralManager extends Leader{

    public GeneralManager(String name) {

        super(name);

    }

 

    @Override

    protected void handleRequest(ShoppingRequest request) {

        if (request.getBillMoney()<200000.00){

            System.out.println(name + "总经理处理物资采购" + request.getShoppingReason() + "采购资金为" + request.getBillMoney() + "元");

        } else {

            System.out.println("董事会将开会处理物资采购" + request.getShoppingReason() + "采购资金为" + request.getBillMoney() + "元");

        }

    }

}