设计模式-23种设计模式-行为型-职责链模式
一、职责链模式介绍
二、职责链模式引入
需求:
UML类图:
代码实现(Java):
//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; } }
public abstract class Approver { Approver approver; //下一个处理者 String name; // 名字 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 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 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 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 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 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); } }
三、职责链模式在在SpringMVC框架应用的源码分析
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