设计模式之责任链模式 chainOfResp

Posted 2020-10-05 大白

后面我们将学习设计模式里面的行为型模式

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 代码实现

/**
 * 抽象类
 * @author bzhx
 * 2017年3月14日
 */
public abstract class Leader {

    protected String name;
    protected Leader nextLeader; //责任链的后继对象
    
    public Leader(String name) {
        super();
        this.name = name;
    }
    //设定责任链上的后继对象
    public void setNextLeader(Leader nextLeader) {
        this.nextLeader = nextLeader;
    }
    
    /**
     * 处理请求的核心业务方法
     * @param request
     */
    public abstract void handleRequest(LeaveRequest request);
}

抽象类Leader

/**
 * 主任
 * @author bzhx
 * 2017年3月14日
 */
public class Manager extends Leader{

    public Manager(String name) {
        super(name);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void handleRequest(LeaveRequest request) {
        if(request.getLeaveDays()<10){
            System.out.println("员工："+request.getEmpName()+"请假，天数："+request.getLeaveDays()+",理由："+request.getReason());
            System.out.println("经理："+this.name+",审批通过！");
        }else{
            if(this.nextLeader!=null){
                this.nextLeader.handleRequest(request);
            }
        }
    }

}

实现类Manager

/**
 * 主任
 * @author bzhx
 * 2017年3月14日
 */
public class Director extends Leader{

    public Director(String name) {
        super(name);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void handleRequest(LeaveRequest request) {
        if(request.getLeaveDays()<3){
            System.out.println("员工："+request.getEmpName()+"请假，天数："+request.getLeaveDays()+",理由："+request.getReason());
            System.out.println("主任："+this.name+",审批通过！");
        }else{
            if(this.nextLeader!=null){
                this.nextLeader.handleRequest(request);
            }
        }
    }

}

实现类 Director

/**
 * 主任
 * @author bzhx
 * 2017年3月14日
 */
public class GeneralManager extends Leader{

    public GeneralManager(String name) {
        super(name);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void handleRequest(LeaveRequest request) {
        if(request.getLeaveDays()<30){
            System.out.println("员工："+request.getEmpName()+"请假，天数："+request.getLeaveDays()+",理由："+request.getReason());
            System.out.println("总经理："+this.name+",审批通过！");
        }else{
            System.out.println("莫非"+request.getEmpName()+"想辞职，居然请假"+request.getLeaveDays()+"天！");
        }
    }

}

实现类 GeneralManager

/**
 * 封装请假的基本信息
 * @author bzhx
 * 2017年3月14日
 */
public class LeaveRequest {

    private String empName;
    private int leaveDays;
    private String reason;
    
    public LeaveRequest(String empName, int leaveDays, String reason) {
        super();
        this.empName = empName;
        this.leaveDays = leaveDays;
        this.reason = reason;
    }

    public String getEmpName() {
        return empName;
    }

    public void setEmpName(String empName) {
        this.empName = empName;
    }

    public int getLeaveDays() {
        return leaveDays;
    }

    public void setLeaveDays(int leaveDays) {
        this.leaveDays = leaveDays;
    }

    public String getReason() {
        return reason;
    }

    public void setReason(String reason) {
        this.reason = reason;
    }
    
    
}

封装请假的信息

public class Client {

    public static void main(String[] args) {
        Leader a = new Director("张三");
        Leader b = new Manager("李四");
        Leader c = new GeneralManager("王五");
        
        //组织责任链对象的关系
        a.setNextLeader(b);
        b.setNextLeader(c);
        
        //开始请假操作
        LeaveRequest req1 = new LeaveRequest("Tom",5,"回英国探亲");
        a.handleRequest(req1);
    }
}

测试调用