本次實驗屬於模仿型實驗，透過本次實驗學生將掌握以下內容：
1、理解職責鏈模式的動機，掌握該模式的結構；
2、能夠利用職責鏈模式解決實際問題。
[實驗任務一]：財務審批
某物資管理系統中物資採購需要分級審批，主任可以審批1萬元及以下的採購單，部門經理可以審批5萬元及以下的採購單，副總經理可以審批10萬元及以下的採購單，總經理可以審批20萬元及以下的採購單，20萬元以上的採購單需要開職工大會確定。現用職責鏈模式設計該系統。
實驗要求：
1. 提交類圖；
2. 提交原始碼；
3. 注意程式設計規範。
1、類圖
原始碼
package org.example;
public class Client {
public static void main(String[] args) {
Leader objDirector,objDepartmentManager,objViceManager,objGeneralManager;
objDirector = new Director("張主任");
objDepartmentManager = new DepartmentManager("劉部門經理");
objViceManager = new ViceManager("王副經理");
objGeneralManager = new GeneralManager("趙經理");
//設定上級
objDirector.setSuccessor(objDepartmentManager);
objDepartmentManager.setSuccessor(objViceManager);
objViceManager.setSuccessor(objGeneralManager);
ShoppingRequest shoppingRequest1 = new ShoppingRequest("買列印紙",1000);
ShoppingRequest shoppingRequest2 = new ShoppingRequest("購置電腦",20000);
ShoppingRequest shoppingRequest3 = new ShoppingRequest("購置空調",80000);
ShoppingRequest shoppingRequest4 = new ShoppingRequest("辦公室裝修",160000);
ShoppingRequest shoppingRequest5 = new ShoppingRequest("收購XX公司",1000000);
objDirector.handleRequest(shoppingRequest1);
System.out.println("");
objDirector.handleRequest(shoppingRequest2);
System.out.println("");
objDirector.handleRequest(shoppingRequest3);
System.out.println("");
objDirector.handleRequest(shoppingRequest4);
System.out.println("");
objDirector.handleRequest(shoppingRequest5);
System.out.println("");
}
}
package org.example;
class DepartmentManager extends Leader{
public DepartmentManager(String name) {
super(name);
}
protected void handleRequest(ShoppingRequest request) {
if (request.getBillMoney()<50000.00){
System.out.println(name + "部門經理處理物資採購" + request.getShoppingReason() + "採購資金為" + request.getBillMoney() + "元");
} else {
if (this.successor != null){
this.successor.handleRequest(request);
}
}
}
}
package org.example;
class Director extends Leader{
public Director(String name) {
super(name);
}
public void handleRequest(ShoppingRequest request){
if (request.getBillMoney()<10000.00){
System.out.println(name + "主任處理物資採購" + request.getShoppingReason() + "採購資金為" + request.getBillMoney() + "元");
} else {
if (this.successor != null){
this.successor.handleRequest(request);
}
}
}
}
package org.example;
class GeneralManager extends Leader{
public GeneralManager(String name) {
super(name);
}
@Override
protected void handleRequest(ShoppingRequest request) {
if (request.getBillMoney()<200000.00){
System.out.println(name + "總經理處理物資採購" + request.getShoppingReason() + "採購資金為" + request.getBillMoney() + "元");
} else {
System.out.println("董事會將開會處理物資採購" + request.getShoppingReason() + "採購資金為" + request.getBillMoney() + "元");
}
}
}
package org.example;
public abstract class Leader {
protected String name;
//上級領導
protected Leader successor;
public Leader(String name) {
this.name = name;
}
public void setSuccessor(Leader successor) {
this.successor = successor;
}
protected abstract void handleRequest(ShoppingRequest request);
}
package org.example;
public class ShoppingRequest {
private String shoppingReason;
private double billMoney;
public ShoppingRequest(String shoppingReason,double billMoney){
this.shoppingReason = shoppingReason;
this.billMoney = billMoney;
}
public String getShoppingReason() {
return shoppingReason;
}
public void setShoppingReason(String shoppingReason) {
this.shoppingReason = shoppingReason;
}
public double getBillMoney() {
return billMoney;
}
public void setBillMoney(double billMoney) {
this.billMoney = billMoney;
}
}
package org.example;
class ViceManager extends Leader{
public ViceManager(String name) {
super(name);
}
@Override
protected void handleRequest(ShoppingRequest request) {
if (request.getBillMoney()<100000.00){
System.out.println(name + "副經理處理物資採購" + request.getShoppingReason() + "採購資金為" + request.getBillMoney() + "元");
} else {
if (this.successor != null){
this.successor.handleRequest(request);
}
}
}
}
3、執行截圖
