01_责任链模式
这是引用《大话设计模式》中的定义：
责任链模式：使多个对象都有机会处理请求，从而避免请求的发送者和接受者的耦合关系，将这个对象连接成一条链，并沿着这条链传递该请求，直到有一个对象处理它为止
适用场景：
一般比较适合应用在流程类的业务中，报销、审理、这种等级森严的制度中；
好处：增强灵活性、解耦
流程的过程可以比较方便的设置在Client或者专门的一个流程类中，可以比较方便的改流程，一下就变灵活了有木有，官方说法是增加了指派类的灵活性；
改了某个节点的逻辑也不影响其他的节点，发送者和接收者都没有对方明确的信息，且链中的自己也不知道自己的结构，结果是职责链可以简化对象的互相连接，只要你知道你的继任者是谁就行了啊；官方说法是耦合度降低；
由此我不由得感叹：真是个好模式啊
tips:不过这个模式比较要小心点地方就是，这个流程定义很重要，如果流程配错了，可能请求就中断了，不知道丢哪了，流程要cover住request的路径啊；
一般就是有个 Handler，Handler中应该有一个自身类型的实例，这个实例的作用就是，如果我处理不了，让我的这个实例去做吧；我没责任啦；快闪
还应该有一个处理request的方法requestApp()；实际逻辑就在里面；
自己写了一组Java代码，以备忘
级别是 经理->总监->总经理
请短假经理批，长假总监批，大长假总经理批，嘿嘿，你要想加薪，想的美啊，总经理批
package chainOfResponsibility;/** * @author ZZP 管理者抽象类 */public abstract class Manager {/** * 姓名 */private String name;/** * 继承者 */private Manager superior;public Manager(String name) {this.setName(name);}public abstract void requestApplication(Request request);public void setName(String name) {this.name = name;}public String getName() {return name;}public void setSuperior(Manager superior) {this.superior = superior;}public Manager getSuperior() {return superior;}}package chainOfResponsibility;/** * @author ZZP 申请 * */public class Request {public Request(String requestType, String requestContent, int number) {super();this.number = number;this.requestContent = requestContent;this.requestType = requestType;}/** * 数量 */private int number;/** * 内容 */private String requestContent;/** * 类型 */private String requestType;public void setNumber(int number) {this.number = number;}public int getNumber() {return number;}public void setRequestContent(String requestContent) {this.requestContent = requestContent;}public String getRequestContent() {return requestContent;}public void setRequestType(String requestType) {this.requestType = requestType;}public String getRequestType() {return requestType;}}package chainOfResponsibility;/** * @author ZZP 经理 */public class CommonManager extends Manager {public CommonManager(String name) {super(name);}@Overridepublic void requestApplication(Request request) {if (request.getRequestType().equals("请假") && request.getNumber() <= 2) {System.out.println(getName() + " :" + request.getRequestType()+ " " + request.getRequestContent() + " "+ request.getNumber() + " 被批准");} else {if (getSuperior() != null) {getSuperior().requestApplication(request);}}}}package chainOfResponsibility;/** * @author ZZP 总监 */public class MajorDomo extends Manager {public MajorDomo(String name) {super(name);}@Overridepublic void requestApplication(Request request) {if (request.getRequestType().equals("请假") && request.getNumber() <= 5) {System.out.println(getName() + " :" + request.getRequestType()+ " " + request.getRequestContent() + " "+ request.getNumber() + " 被批准");} else {if (getSuperior() != null) {getSuperior().requestApplication(request);}}}}package chainOfResponsibility;/** * @author ZZP 总经理 */public class GerneralManager extends Manager {public GerneralManager(String name) {super(name);}@Overridepublic void requestApplication(Request request) {if (request.getRequestType().equals("请假")) {System.out.println(getName() + " :" + request.getRequestType()+ " " + request.getRequestContent() + " "+ request.getNumber() + " 被批准");} else if (request.getRequestType().equals("加薪")&& request.getNumber() <= 500) {System.out.println(getName() + " :" + request.getRequestType()+ " " + request.getRequestContent() + " "+ request.getNumber() + " 被批准");} else if (request.getRequestType().equals("加薪")&& request.getNumber() > 500) {System.out.println(getName() + " :" + request.getRequestType()+ " " + request.getRequestContent() + " "+ request.getNumber() + " 再说吧");}}}package chainOfResponsibility;public class TestChainOfResponsibility {public static void main(String args[]) {CommonManager jingli = new CommonManager("经理");MajorDomo zongjian = new MajorDomo("总监");GerneralManager zongjingli = new GerneralManager("总经理");jingli.setSuperior(zongjian);zongjian.setSuperior(zongjingli);Request req1 = new Request("请假", "小李肚子疼", 1);Request req2 = new Request("请假", "小张堵车", 4);Request req3 = new Request("请假", "小王生病了", 10);Request req4 = new Request("加薪", "小赵要加薪", 500);Request req5 = new Request("加薪", "小小要加薪", 1500);jingli.requestApplication(req1);jingli.requestApplication(req2);jingli.requestApplication(req3);jingli.requestApplication(req4);jingli.requestApplication(req5);}}