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；

3. 注意编程规范。

 

package ruanjiansheji.shiyan15;

public class DepartmentManager extends Leader{
    public DepartmentManager(String name) {
        super(name);
    }

    @Override
    public void handleRequest(PurchaseRequest purchaseRequest) {
        if (purchaseRequest.getPrice() > 10000 && purchaseRequest.getPrice() <= 50000) {
            System.out.println("请求采购单:" + purchaseRequest.getName() + "被" + this.name + "审批");
        } else {
            if(this.successor != null){
                this.successor.handleRequest(purchaseRequest);
            }

        }
    }
}
package ruanjiansheji.shiyan15;

public class DeputyManager extends Leader{
    public DeputyManager(String name) {
        super(name);
    }

    @Override
    public void handleRequest(PurchaseRequest purchaseRequest) {
        if (purchaseRequest.getPrice() > 50000 && purchaseRequest.getPrice() <= 100000) {
            System.out.println("请求采购单:" + purchaseRequest.getName() + "被" + this.name + "审批");
        } else {
            if(this.successor != null){
                this.successor.handleRequest(purchaseRequest);
            }

        }
    }
}
package ruanjiansheji.shiyan15;

public class Director extends Leader{
    public Director(String name) {
        super(name);
    }

    @Override
    public void handleRequest(PurchaseRequest purchaseRequest) {
        if (purchaseRequest.getPrice() <= 10000) {
            System.out.println("请求采购单:" + purchaseRequest.getName() + "被" + this.name + "审批");
        } else {
            if(this.successor != null){
                this.successor.handleRequest(purchaseRequest);
            }

        }
    }
}
package ruanjiansheji.shiyan15;

public class GeneralManager extends Leader{
    public GeneralManager(String name) {
        super(name);
    }

    @Override
    public void handleRequest(PurchaseRequest purchaseRequest) {
        if (purchaseRequest.getPrice() <= 200000) {
            System.out.println("请求采购单:" + purchaseRequest.getName() + "被" + this.name + "审批");
        } else {
            System.out.println("请求采购单:" + purchaseRequest.getName() + "需要开大会审批");

        }
    }
}
package ruanjiansheji.shiyan15;

public  abstract class Leader {

    String name;

    Leader successor;

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



    public void setSuccessor(Leader successor) {
        this.successor = successor;
    }


    public abstract void handleRequest(PurchaseRequest purchaseRequest);
}
package ruanjiansheji.shiyan15;

public class Main {
    public static void main(String[] args) {
        Leader director = new Director("director");
        Leader departmentManager = new DepartmentManager("departmentManager");
        Leader deputyManager = new DeputyManager("deputyManager");
        Leader generalManager = new GeneralManager("generalManager");
        director.setSuccessor(departmentManager);
        departmentManager.setSuccessor(deputyManager);
        deputyManager.setSuccessor(generalManager);

        PurchaseRequest purchaseRequest1 = new PurchaseRequest("product1", 10000);
        director.handleRequest(purchaseRequest1);
        PurchaseRequest purchaseRequest2 = new PurchaseRequest("product2", 50000);
        director.handleRequest(purchaseRequest2);
        PurchaseRequest purchaseRequest3 = new PurchaseRequest("product3", 100000);
        director.handleRequest(purchaseRequest3);
        PurchaseRequest purchaseRequest4 = new PurchaseRequest("product4", 200000);
        director.handleRequest(purchaseRequest4);
        PurchaseRequest purchaseRequest5 = new PurchaseRequest("product5", 300000);
        director.handleRequest(purchaseRequest5);
    }
}
package ruanjiansheji.shiyan15;

public class PurchaseRequest {
    private float price;
    private String name;

    public PurchaseRequest(String name, float price) {
        this.name = name;
        this.price = price;
    }


    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    public String getName() {
        return name;
    }

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