职责链模式解决OA系统采购审批问题

• 问题描述

编写程序完成学校OA系统的采购审批项目
• 采购员采购教学器材
• 如果金额 小于等于5000, 由教学主任审批
• 如果金额 小于等于10000, 由院长审批
• 如果金额 小于等于30000, 由副校长审批
• 如果金额 超过30000以上，有校长审批

• 方案类图
  

• 代码实现

package com.atguigu.responsibilitychain;
//请求类
public class PurchaseRequest {

	private int type = 0; //请求类型
	private float price = 0.0f; //请求金额
	private int id = 0;
	//构造器
	public PurchaseRequest(int type, float price, int id) {
		this.type = type;
		this.price = price;
		this.id = id;
	}
	public int getType() {
		return type;
	}
	public float getPrice() {
		return price;
	}
	public int getId() {
		return id;
	}
	
}

package com.atguigu.responsibilitychain;
public abstract class Approver {

	Approver approver;  //下一个处理者
	String name; // 名字
	
	public Approver(String name) {
		// TODO Auto-generated constructor stub
		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);
	
}

package com.atguigu.responsibilitychain;
public class DepartmentApprover extends Approver {
	
	public DepartmentApprover(String name) {
		// TODO Auto-generated constructor stub
		super(name);
	}
	
	@Override
	public void processRequest(PurchaseRequest purchaseRequest) {
		// TODO Auto-generated method stub
		if(purchaseRequest.getPrice() <= 5000) {
			System.out.println(" 请求编号 id= " + purchaseRequest.getId() + " 被 " + this.name + " 处理");
		}else {
			approver.processRequest(purchaseRequest);
		}
	}

}

package com.atguigu.responsibilitychain;
public class CollegeApprover extends Approver {

	public CollegeApprover(String name) {
		// TODO Auto-generated constructor stub
		super(name);
	}
	
	@Override
	public void processRequest(PurchaseRequest purchaseRequest) {
		// TODO Auto-generated method stub
		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);
		}
	}
	
}

package com.atguigu.responsibilitychain;
public class ViceSchoolMasterApprover extends Approver {

	public ViceSchoolMasterApprover(String name) {
		// TODO Auto-generated constructor stub
		super(name);
	}
	
	@Override
	public void processRequest(PurchaseRequest purchaseRequest) {
		// TODO Auto-generated method stub
		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);
		}
	}
	
}

package com.atguigu.responsibilitychain;
public class SchoolMasterApprover extends Approver {

	public SchoolMasterApprover(String name) {
		// TODO Auto-generated constructor stub
		super(name);
	}
	
	@Override
	public void processRequest(PurchaseRequest purchaseRequest) {
		// TODO Auto-generated method stub
		if(purchaseRequest.getPrice() > 30000) {
			System.out.println(" 请求编号 id= " + purchaseRequest.getId() + " 被 " + this.name + " 处理");
		}else {
			approver.processRequest(purchaseRequest);
		}
	}
	
}

package com.atguigu.responsibilitychain;
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("李院长");
		ViceSchoolMasterApprover viceSchoolMasterApprover = new ViceSchoolMasterApprover("王副校");
		SchoolMasterApprover schoolMasterApprover = new SchoolMasterApprover("佟校长");
		
		//需要将各个审批级别的下一个设置好 (处理人构成环形: )
		departmentApprover.setApprover(collegeApprover);
		collegeApprover.setApprover(viceSchoolMasterApprover);
		viceSchoolMasterApprover.setApprover(schoolMasterApprover);
		schoolMasterApprover.setApprover(departmentApprover);
		
		departmentApprover.processRequest(purchaseRequest);
		viceSchoolMasterApprover.processRequest(purchaseRequest);
	}

}