责任链模式

当有多个对象可以处理同一请求，具体哪个对象要到运行时再定，客户端只需将请求提交到责任链上，无需关心谁处理

适用场景：采购审批子系统、OA中假条审批模块

 1 public interface ChainHandler {
 2 
 3     public void operator();
 4     
 5 }
 6 
 7 public abstract class AbstractChainHandler {
 8 
 9     private ChainHandler handler;
10     
11     public ChainHandler getHandler(){
12         return handler;
13     }
14     
15     public void setHandler(ChainHandler handler){
16         this.handler = handler;
17     }
18     
19 }
20 
21 public class MyChainHandler extends AbstractChainHandler implements ChainHandler {
22 
23     private String name;
24     
25     public MyChainHandler(String name) {
26         this.name = name;
27     }
28     
29     @Override
30     public void operator() {
31         System.out.println(name + "开始处理");
32         ChainHandler handler = getHandler();
33         if(null != handler){
34             handler.operator();
35         }else{
36             System.out.println("处理完毕");
37         }
38     }
39 
40 }
41 
42 public class ChainMain {
43 
44     public static void main(String[] args) {
45         MyChainHandler handler1 = new MyChainHandler("h1");
46         MyChainHandler handler2 = new MyChainHandler("h2");
47         MyChainHandler handler3 = new MyChainHandler("h3");
48         MyChainHandler handler4 = new MyChainHandler("h4");
49         
50         handler1.setHandler(handler2);
51         handler2.setHandler(handler3);
52         handler3.setHandler(handler4);
53         
54         handler1.operator();
55     }
56 
57 }

输出：

h1开始处理
h2开始处理
h3开始处理
h4开始处理
处理完毕

　　

posted @ 2017-06-07 21:01  鬼神不灭  阅读(127)  评论(0)  编辑  收藏  举报