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职责链模式是保证一个事件一定能够被处理的一种模式。比如：一个coder去请假，temLeader批5天一下的，Manager批10天的，就这么简单。职责链模式是一种行为模式。 职责链模式类图： [img]http://dl.iteye.com/upload/attachment/364668/53040d7b-7b4a-3089-8bd4-83a72de64730.jpg[/img] 说明： Coder发出Something请求，经过TeamLeader->Manager构成的链，如果TeamLeader能处理，就返回结果，不能则有Manager处理。变化之处在于，当TeamLeader不在时（也可以是因为某种原因这里down掉了），则由链中其他环节去处理了，这样就保证了请求一定能被处理，增强了系统的健壮性。 具体代码：

package chainOfResponsibilityPattern; public class Something {
  	private String name; 	private int days; 	public String getName() {
  		return name; 	} 	public void setName(String name) {
  		this.name = name; 	} 	public int getDays() {
  		return days; 	} 	public void setDays(int days) {
  		this.days = days; 	} }

抽象人

package chainOfResponsibilityPattern; public abstract class Person {
  	private Something something; 	private boolean isHere;//上班标志位 	public abstract void request(Something something,Person toperson); 	public abstract void response(Person person); 	public Something getSomething() {
  		return something; 	} 	public void setSomething(Something something) {
  		this.something = something; 	} 	public boolean isHere() {
  		return isHere; 	} 	public void setHere(boolean isHere) {
  		this.isHere = isHere; 	} }

manager:

package chainOfResponsibilityPattern; public class Manager extends Person{
  	@Override 	public void request(Something something, Person toperson) {
  		// TODO Auto-generated method stub 	} 	@Override 	public void response(Person person) {
  		if(person.getSomething().getDays()<10&&this.isHere()){
  			System.out.println("Manager deal with it"); 			System.out.println("Agree"); 		}else{
  			System.out.println("Disagree"); 		} 	} }

码农：

package chainOfResponsibilityPattern; public class Coder extends Person{
  	private Something something; 	private Person leader; 	public Person getLeader() {
  		return leader; 	} 	public void setLeader(Person leader) {
  		this.leader = leader; 	} 	public Something getSomething() {
  		return something; 	} 	public void setSomething(Something something) {
  		this.something = something; 	} 	@Override 	public void response(Person person) {
  		// TODO Auto-generated method stub 	} 	@Override 	public void request(Something something,Person toPerson) {
  		System.out.println("For "+something.getName()+" ask for a " + 				"leave of about "+something.getDays()+" days"); 		leader.response(Coder.this); 	} }

TeamLeader

package chainOfResponsibilityPattern; public class TeamLeader extends Person{
  	private Person leader; 	private boolean isHere; 	public Person getLeader() {
  		return leader; 	} 	public void setLeader(Person leader) {
  		this.leader = leader; 	} 	@Override 	public void response( Person person) {
  		if(person.getSomething().getDays()<5 && this.isHere){
  			System.out.println("Agree"); 		}else{
  			System.out.println("TeamLeader can not deal,send it to Manager"); 			leader.response(person); 		} 	} 	@Override 	public void request(Something something, Person toperson) {
  	} }

测试类：

package chainOfResponsibilityPattern; public class ChainOfResponsibilityTest {
  	public static void main(String[] args){
  		Something something = new Something(); 		something.setDays(4); 		something.setName("nothing"); 		Coder coder = new Coder(); 		coder.setSomething(something); 		TeamLeader teamLeader = new TeamLeader(); 		Person manager = new Manager(); 		manager.setHere(true); 		teamLeader.setHere(true); 		teamLeader.setLeader(manager); 		coder.setLeader(teamLeader); 		coder.request(something, teamLeader); 		teamLeader.setHere(false); 		manager.setHere(true); 		coder.setSomething(something); 		coder.request(something, teamLeader); 	} }

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