OA系统采购审批需求

学校OA系统的采购审批项目: 需求是

1. 采购员采购教学器材
2. 如果金额 小于等于5000，由教学主任审批
3. 如果金额 小于等于10000，由院长审批
4. 如果金额 小于等于30000， 由副校长审批
5. 如果金额 超过30000以上，有校长审批

责任链模式基本介绍:
基本介绍:

1. 职责链模式(Chain of Responsibility Pattern), 又叫责任链模式，为请求创建了一个接受者对象的链。这种模式对请求的发送者和接收者进行解耦。
2. 责任链模式通常每个接收者都包含对另一个接收者的引用。如果一个对象不能处理该请求，那么它会把相同的请求传给下一个接收者，依次类推
   3）这种类型的设计模式属于行为型模式。

public abstract class Approver {
    //下一个处理者
    Approver approver;
    String name;

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

    // 下一个处理者
    public void setApprover(Approver approver){
        this.approver = approver;
    }

    //处理审批请求的方法，得到一个请求，处理是子类完成，因此该方法做成抽象
    public abstract void processRequest(PurchaseRequest purchaseRequest);
}
public class SchoolMasterApprover extends Approver{

    public SchoolMasterApprover(String name) {
        super(name);
    }

    @Override
    public void processRequest(PurchaseRequest purchaseRequest) {
        if(purchaseRequest.getPrice() >= 30000) {
            System.out.println("请求编号 id = " + purchaseRequest.getId() + " 被" + this.name + " 处理");
        } else{
            approver.processRequest(purchaseRequest);
        }
    }
}
public class ViceSchoolMasterApprover extends Approver{
    public ViceSchoolMasterApprover(String name) {
        super(name);
    }

    @Override
    public void processRequest(PurchaseRequest purchaseRequest) {
        if(purchaseRequest.getPrice() >= 10000 && purchaseRequest.getPrice() < 30000) {
            System.out.println("请求编号 id = " + purchaseRequest.getId() + " 被" + this.name + " 处理");
        } else{
            approver.processRequest(purchaseRequest);
        }
    }
}
public class CollegeApprover extends Approver{
    public CollegeApprover(String name) {
        super(name);
    }

    @Override
    public void processRequest(PurchaseRequest purchaseRequest) {
        if(purchaseRequest.getPrice() >= 5000 && purchaseRequest.getPrice() < 10000) {
            System.out.println("请求编号 id = " + purchaseRequest.getId() + " 被" + this.name + " 处理");
        } else{
            approver.processRequest(purchaseRequest);
        }
    }
}
public class DepartmentApprover extends Approver{

    public DepartmentApprover(String name) {
        super(name);
    }

    @Override
    public void processRequest(PurchaseRequest purchaseRequest) {
        if(purchaseRequest.getPrice() <= 5000){
            System.out.println("请求编号 id = " + purchaseRequest.getId() + " 被" + this.name + " 处理");
        } else{
            approver.processRequest(purchaseRequest);
        }
    }
}
public class PurchaseRequest {
    private int type; // 请求类型
    private float price = 0.0f;
    private int id = 0;

    public PurchaseRequest(int type,float price, int id) {
        this.type = type;
        this.price = price;
        this.id = id;
    }

    public float getPrice() {
        return price;
    }

    public int getType() {
        return type;
    }

    public int getId() {
        return id;
    }
}
public class Client {
    public static void main(String[] args) {
        //创建一个请求
        PurchaseRequest purchaseRequest = new PurchaseRequest(1, 31000, 1);

        //创建相关的审批人
        DepartmentApprover departmentApprover = new DepartmentApprover("张主任");
        CollegeApprover collegeApprover = new CollegeApprover("张院长");
        ViceSchoolMasterApprover viceSchoolMasterApprover = new ViceSchoolMasterApprover("张副校长");
        SchoolMasterApprover schoolMasterApprover = new SchoolMasterApprover("张校长");
        departmentApprover.setApprover(collegeApprover);
        collegeApprover.setApprover(viceSchoolMasterApprover);
        viceSchoolMasterApprover.setApprover(schoolMasterApprover);
        schoolMasterApprover.setApprover(departmentApprover);

        departmentApprover.processRequest(purchaseRequest);
        viceSchoolMasterApprover.processRequest(purchaseRequest);
    }
}

测试:

image.png