Sunny 软件公司的 OA 系统需要提供一个假条审批模块：如果员工请假天数小于 3 天，主任可以审批该请假条；如果员工请假天数大于或等于 3 天，小于 10 天，经理可以审批；如果员工请假天数大于或等于 10 天，小于 30 天，总经理可以审批；如果超过 30 天，总经理也不能审批，提示相应的拒绝信息。试用职责链模式设计该假条审批模块。
一、类结构图
抽象处理者类：设计为抽象类 Approver，持有一个 Approver 类型的成员 successor 的引用，包含设置后续者具体方法 setSuccessor()、处理审批逻辑的抽象方法 processApproval()；
具体处理者类：设计为抽象处理者类的子类，具体实现处理审批逻辑的抽象方法 processApproval()；
假条审批请求类：名称为 LeaveApproval，包含请假条的基本信息。
二、典型实现代码
抽象假条审批者类：抽象处理者类
// 抽象假条审批者类：抽象处理者类public abstract class Approvor { protected Approvor successor; protected String name; public Approvor(String name) { this.name = name; }
public void setSuccessor(Approvor successor) { this.successor = successor; }
public abstract void processApproval(LeaveApproval leaveApproval);}
复制代码
主任审批者类：具体处理者类
// 主任审批者类：具体处理者类public class Director extends Approvor {
public Director(String name) { super(name); }
@Override public void processApproval(LeaveApproval leaveApproval) { if (leaveApproval.getLeaveDays() < 3) { System.out.println(name + "审批假条：通过"); } else { successor.processApproval(leaveApproval); } }}
复制代码
经理审批者类：具体处理者类
// 经理审批者类：具体处理者类public class Manager extends Approvor {
public Manager(String name) { super(name); }
@Override public void processApproval(LeaveApproval leaveApproval) { if (leaveApproval.getLeaveDays() >= 3 && leaveApproval.getLeaveDays() < 10) { System.out.println(name + "审批假条：通过"); } else { successor.processApproval(leaveApproval); } }}
复制代码
总经理审批者类：具体处理者类
// 总经理审批者类：具体处理者类public class President extends Approvor {
public President(String name) { super(name); }
@Override public void processApproval(LeaveApproval leaveApproval) { if (leaveApproval.getLeaveDays() >= 10 && leaveApproval.getLeaveDays() < 30) { System.out.println(name + "审批假条：通过"); } else { System.out.println("不允许此类假条的审批，已被拒绝"); } }}
复制代码
假条审批请求类：
// 假条审批请求类public class LeaveApproval { private String name; // 请假姓名 private Date startDate; // 请假日期 private Integer leaveDays; // 请假天数
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public Date getStartDate() { return startDate; }
public void setStartDate(Date startDate) { this.startDate = startDate; }
public Integer getLeaveDays() { return leaveDays; }
public void setLeaveDays(Integer leaveDays) { this.leaveDays = leaveDays; }}
复制代码
客户端代码：
public class Client { public static void main(String[] args) { Approvor director, manager, president; director = new Director("主任"); manager = new Manager("经理"); president = new President("总经理");
// 创建责任链 director.setSuccessor(manager); manager.setSuccessor(president);
// 创建请假审批请求 LeaveApproval leaveApproval; leaveApproval = new LeaveApproval(); leaveApproval.setName("张无忌"); leaveApproval.setStartDate(new Date()); leaveApproval.setLeaveDays(1); director.processApproval(leaveApproval);
leaveApproval.setLeaveDays(5); director.processApproval(leaveApproval);
leaveApproval.setLeaveDays(10); director.processApproval(leaveApproval);
leaveApproval.setLeaveDays(30); director.processApproval(leaveApproval); }}
复制代码
编译并运行程序，输出如下结果：
主任审批假条：通过经理审批假条：通过总经理审批假条：通过不允许此类假条的审批，已被拒绝
复制代码
评论