10.5

软件设计                  石家庄铁道大学信息学院

 

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；

// 采购单类

class PurchaseRequest {

    private double amount;

    private String purpose;

 

    public PurchaseRequest(double amount, String purpose) {

        this.amount = amount;

        this.purpose = purpose;

    }

 

    public double getAmount() {

        return amount;

    }

 

    public String getPurpose() {

        return purpose;

    }

}

 

 

 

// 审批者抽象类

abstract class Approver {

    protected Approver successor;

 

    public void setSuccessor(Approver successor) {

        this.successor = successor;

    }

 

    public abstract void processRequest(PurchaseRequest request);

}

 

 

// 主任审批者类

class Director extends Approver {

    @Override

    public void processRequest(PurchaseRequest request) {

        if (request.getAmount() <= 10000) {

            System.out.println("主任审批通过，采购单金额：" + request.getAmount() + "，用途：" + request.getPurpose());

        } else if (successor!= null) {

            successor.processRequest(request);

        }

    }

}

 

// 部门经理审批者类

class DepartmentManager extends Approver {

    @Override

    public void processRequest(PurchaseRequest request) {

        if (request.getAmount() <= 50000) {

            System.out.println("部门经理审批通过，采购单金额：" + request.getAmount() + "，用途：" + request.getPurpose());

        } else if (successor!= null) {

            successor.processRequest(request);

        }

    }

}

 

// 副总经理审批者类

class ViceGeneralManager extends Approver {

    @Override

    public void processRequest(PurchaseRequest request) {

        if (request.getAmount() <= 100000) {

            System.out.println("副总经理审批通过，采购单金额：" + request.getAmount() + "，用途：" + request.getPurpose());

        } else if (successor!= null) {

            successor.processRequest(request);

        }

    }

}

 

// 总经理审批者类

class GeneralManager extends Approver {

    @Override

    public void processRequest(PurchaseRequest request) {

        if (request.getAmount() <= 200000) {

            System.out.println("总经理审批通过，采购单金额：" + request.getAmount() + "，用途：" + request.getPurpose());

        } else {

            System.out.println("采购单金额超过20万元，需要开职工大会确定，采购单金额：" + request.getAmount() + "，用途：" + request.getPurpose());

        }

    }

}

 

 

 

public class Main {

    public static void main(String[] args) {

        // 创建各级审批者对象

        Approver director = new Director();

        Approver departmentManager = new DepartmentManager();

        Approver viceGeneralManager = new ViceGeneralManager();

        Approver generalManager = new GeneralManager();

 

        // 设置审批链顺序

        director.setSuccessor(departmentManager);

        departmentManager.setSuccessor(viceGeneralManager);

        viceGeneralManager.setSuccessor(generalManager);

 

        // 创建不同金额的采购单并进行审批

        PurchaseRequest request1 = new PurchaseRequest(8000, "办公用品采购");

        director.processRequest(request1);

 

        PurchaseRequest request2 = new PurchaseRequest(30000, "设备采购");

        director.processRequest(request2);

 

        PurchaseRequest request3 = new PurchaseRequest(80000, "项目材料采购");

        director.processRequest(request3);

 

        PurchaseRequest request4 = new PurchaseRequest(150000, "大型设备采购");

        director.processRequest(request4);

 

        PurchaseRequest request5 = new PurchaseRequest(250000, "新业务拓展采购");

        director.processRequest(request5);

    }

}

3. 注意编程规范。