设计模式——职责链模式

一、任务

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。

二、类图

三、代码

1、Java代码

 1 package tutorial15;
 2 
 3 
 4 import java.math.BigDecimal;
 5 import java.util.ArrayList;
 6 import java.util.Scanner;
 7  
 8 public class Client {
 9     public static void main(String args[]) {
10         Leader director = new Director("Tom"),
11         partmentManager = new PartmentManager("Jack"),
12         generalManager = new GeneralManager("Rose"),
13         vic = new VicManager("Wang");
14  
15         director.setSuccessor(partmentManager);
16         partmentManager.setSuccessor(generalManager);
17         generalManager.setSuccessor(vic);
18         System.out.println("请输入要采购的金额：");
19         Scanner in =new Scanner(System.in);
20         int m=in.nextInt();
21  
22         Request request=new Request(new BigDecimal(m));
23         
24         director.handlerRequest(request);
25         
26         System.out.println("请输入要采购的金额：");
27         int n=in.nextInt();
28         Request request1=new Request(new BigDecimal(n));
29         
30         director.handlerRequest(request1);
31        
32         
33     }
34 }

Client

 1 package tutorial15;
 2 
 3 import java.math.BigDecimal;
 4 
 5 
 6 
 7 abstract public class Leader {
 8     protected String name;
 9     protected Leader successor;
10  
11     public void setSuccessor(Leader successor){
12         this.successor=successor;
13     }
14  
15     public  Leader(String name){
16         this.name=name;
17     }
18     abstract public void handlerRequest(Request request);
19 
20 
21 }

Leader

 1 package tutorial15;
 2 
 3 import java.math.BigDecimal;
 4 
 5 
 6 
 7 public class Director extends Leader {
 8     public Director(String name){
 9         super(name);
10     }
11     public void handlerRequest(Request request){
12        BigDecimal bigDecimal=new BigDecimal(10000.00);
13         if(request.getCost().compareTo(bigDecimal)==-1||request.getCost().compareTo(bigDecimal)==0){
14             System.out.println("主任"+name+"审批，采购金额为："+request.getCost());
15         }
16         else {
17             this.successor.handlerRequest(request);
18         }
19     }
20 
21 
22 
23 }

Director

 1 package tutorial15;
 2 
 3 import java.math.BigDecimal;
 4 
 5 //副总经理
 6 public class GeneralManager extends Leader{
 7     public GeneralManager(String name){
 8         super(name);
 9     }
10     public void handlerRequest(Request request){
11         BigDecimal bigDecimal=new BigDecimal(100000.00);
12         if(request.getCost().compareTo(bigDecimal)==-1||request.getCost().compareTo(bigDecimal)==0){
13             System.out.println("副总经理"+name+"审批，采购金额为："+request.getCost());
14         }
15         else {
16             this.successor.handlerRequest(request);
17         }
18     }
19 
20 
21 
22 }

GeneralManager

 1 package tutorial15;
 2 
 3 import java.math.BigDecimal;
 4 
 5 //部门经理
 6 public class PartmentManager extends Leader{
 7     public PartmentManager(String name){
 8         super(name);
 9     }
10     public void handlerRequest(Request request){
11         BigDecimal bigDecimal=new BigDecimal(50000.00);
12         if(request.getCost().compareTo(bigDecimal)==-1||request.getCost().compareTo(bigDecimal)==0){
13             System.out.println("部门经理"+name+"审批，采购金额为："+request.getCost());
14         }
15         else {
16             this.successor.handlerRequest(request);
17         }
18     }
19 
20 
21 }

PartmentManager

 1 package tutorial15;
 2 
 3 import java.math.BigDecimal;
 4 
 5 //总经理
 6 public class VicManager extends Leader{
 7     public VicManager(String name){
 8         super(name);
 9     }
10     public void handlerRequest(Request request){
11         BigDecimal bigDecimal=new BigDecimal(200000.00);
12         if(request.getCost().compareTo(bigDecimal)==-1||request.getCost().compareTo(bigDecimal)==0){
13             System.out.println("总经理"+name+"审批，采购金额为："+request.getCost());
14         }
15         else {
16             System.out.println("采购金额为："+request.getCost()+"   "+"数额过大，需开会决定！");
17         }
18     }
19 
20 
21 }

VicManager

 1 package tutorial15;
 2 
 3 import java.math.BigDecimal;
 4 
 5 public class Request {
 6      private BigDecimal cost;
 7         public Request(BigDecimal bigDecimal){
 8             this.cost=bigDecimal;
 9         }
10         public BigDecimal getCost(){
11             return cost;
12         }
13         public void setCost(BigDecimal bigDecimal){
14             this.cost=bigDecimal;
15         }
16 
17 
18 }

Request

2、C++代码

  1 #include<iostream>
  2 using namespace std;
  3 //抽象管理者
  4 class Manager
  5 {
  6 protected:
  7     Manager* m_manager;
  8     string m_name;
  9 public:
 10     Manager(Manager* manager, string name) :m_manager(manager), m_name(name) {}
 11     virtual void DealWithRequest(string name, int num) {}
 12 };
 13 //部门经理
 14 class Director : public Manager
 15 {
 16 public:
 17     Director(Manager* manager, string name) :Manager(manager, name) {}
 18 
 19     void DealWithRequest(string name, int num)
 20     {
 21         if (num < 10000) //经理职权之内
 22         {
 23             cout << "主任" << m_name << "审批" << name << "采购金额：" << num << "元" << endl << endl;
 24         }
 25         else
 26         {
 27             cout << "主任" << m_name << "无法处理，交由部门经理处理" << endl;
 28             m_manager->DealWithRequest(name, num);
 29         }
 30     }
 31 };
 32 //部门经理
 33 class DepartmentManager : public Manager
 34 {
 35 public:
 36     DepartmentManager(Manager* manager, string name) :Manager(manager, name) {}
 37     void DealWithRequest(string name, int num)
 38     {
 39         if (num < 50000) //经理职权之内
 40         {
 41             cout << "部门经理" << m_name << "审批" << name << "采购金额：" << num << "元" << endl << endl;
 42         }
 43         else
 44         {
 45             cout << "部门经理" << m_name << "无法处理，交由副总经理处理" << endl;
 46             m_manager->DealWithRequest(name, num);
 47         }
 48     }
 49 };
 50 //副总经理
 51 class DeputyManager : public Manager
 52 {
 53 public:
 54     DeputyManager(Manager* manager, string name) :Manager(manager, name) {}
 55     void DealWithRequest(string name, int num)
 56     {
 57         if (num < 100000) //总监职权之内
 58         {
 59             cout << "副总经理" << m_name << "审批" << name << "采购金额：" << num << "元" << endl << endl;
 60         }
 61         else
 62         {
 63             cout << "副总经理" << m_name << "无法处理，交由总经理处理" << endl;
 64             m_manager->DealWithRequest(name, num);
 65         }
 66     }
 67 };
 68 //总经理
 69 class GeneralManager : public Manager
 70 {
 71 public:
 72     GeneralManager(Manager* manager, string name) :Manager(manager, name) {}
 73     void DealWithRequest(string name, int num)  //总经理可以处理所有请求
 74     {
 75         if (num < 200000) {
 76             cout << "副总经理" << m_name << "审批" << name << "采购金额：" << num << "元" << endl << endl;
 77         }
 78         else {
 79             cout << "采购金额为：" << num << "元，采购金额过大，需开职工大会决定！" << endl;
 80         }
 81     }
 82 };
 83 int main()
 84 {
 85     Manager* general = new GeneralManager(NULL, "A"); //设置上级，总经理没有上级
 86     Manager* deputyManager = new DeputyManager(general, "B"); //设置副总经理上级为总经理
 87     Manager* departmentManager = new DepartmentManager(deputyManager, "C"); //设置部门经理上级为副总经理
 88     Manager* director = new Director(departmentManager, "D"); //设置部门经理上级为副总经理
 89     cout << "请输入采购金额：";
 90     int m;
 91     cin >> m;
 92     director->DealWithRequest("采购员", m);
 93 
 94 
 95     delete director;
 96     delete departmentManager; 
 97     delete deputyManager;
 98     delete general;
 99     return 0;
100 }

Client

四、结果

1、Java结果截图：

2、C++结果截图：

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原文地址：https://www.cnblogs.com/Lizhichengweidashen/p/15564014.html