实验15：职责链模式

 

[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；

package test15;

 

public class PurchaseRequest {

    private int number; // 采购单号

    private double amount; // 采购金额

 

    public PurchaseRequest(int number, double amount) {

        this.number = number;

        this.amount = amount;

    }

 

    public int getNumber() {

        return number;

    }

 

    public double getAmount() {

        return amount;

    }

}

 

 

 

 

package test15;

 

public abstract class Approver {

    protected Approver successor; // 后继者

 

    public void setSuccessor(Approver successor) {

        this.successor = successor;

    }

 

    public abstract void processRequest(PurchaseRequest request);

}

 

package test15;

 

public class Director extends Approver {

    @Override

    public void processRequest(PurchaseRequest request) {

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

            System.out.println("主任审批采购单，单号：" + request.getNumber());

        } else if (successor != null) {

            successor.processRequest(request);

        }

    }

}

 

 

package test15;

 

public class Manager extends Approver {

    @Override

    public void processRequest(PurchaseRequest request) {

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

            System.out.println("部门经理审批采购单，单号：" + request.getNumber());

        } else if (successor != null) {

            successor.processRequest(request);

        }

    }

}

 

 

package test15;

 

public class VicePresident extends Approver {

    @Override

    public void processRequest(PurchaseRequest request) {

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

            System.out.println("副总经理审批采购单，单号：" + request.getNumber());

        } else if (successor != null) {

            successor.processRequest(request);

        }

    }

}

 

package test15;

 

public class President extends Approver {

    @Override

    public void processRequest(PurchaseRequest request) {

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

            System.out.println("总经理审批采购单，单号：" + request.getNumber());

        } else if (successor != null) {

            successor.processRequest(request);

        }

    }

}

 

package test15;

 

public class Congress extends Approver {

    @Override

    public void processRequest(PurchaseRequest request) {

        System.out.println("职工大会审批采购单，单号：" + request.getNumber());

    }

}

 

package test15;

 

public class Main {

    public static void main(String[] args) {

        Approver director = new Director();

        Approver manager = new Manager();

        Approver vicePresident = new VicePresident();

        Approver president = new President();

        Approver congress = new Congress();

 

        director.setSuccessor(manager);

        manager.setSuccessor(vicePresident);

        vicePresident.setSuccessor(president);

        president.setSuccessor(congress);

 

        // 模拟采购流程

        PurchaseRequest request1 = new PurchaseRequest(1, 8000);

        PurchaseRequest request2 = new PurchaseRequest(2, 30000);

        PurchaseRequest request3 = new PurchaseRequest(3, 90000);

        PurchaseRequest request4 = new PurchaseRequest(4, 150000);

        PurchaseRequest request5 = new PurchaseRequest(5, 250000);

 

        director.processRequest(request1);

        director.processRequest(request2);

        director.processRequest(request3);

        director.processRequest(request4);

        director.processRequest(request5);

    }

}

3. 注意编程规范。