简介：

责任链模式通俗点讲就是，打开层次箱子，最终发现真正的珠宝。

 

模式：

1.假设层层箱子分别为A、B、C、D，珠宝为X。

2.先将X放在D中，那么D认为X是珠宝；在把D放在C中，那么C认为D是珠宝；再把C放在B中，那么B认为C是珠宝；再把B放在A中，那么A认为B是珠宝。

3.执行A-B-C-D-X.

 

代码：

1.箱子抽象为接口

1 package com.bluejie.bluej.java.design.chain; 2  3 import com.bluejie.bluej.logUtil.LogUtil; 4 import org.slf4j.Logger; 5  6 /** 7  * Created by bluej on 2018/2/1. 8  */ 9 public interface Handler {10 11     Logger log = LogUtil.instance(Handler.class);12 13     void doHandle(Executor executor);14 }

  

2.各层箱子实现类

1 package com.bluejie.bluej.java.design.chain; 2  3 /** 4  * Created by bluej on 2018/2/1. 5  */ 6 public class LogHandler implements Handler { 7     @Override 8     public void doHandle(Executor executor) { 9         log.info("--LogHandler--");10         executor.doExecutor();11     }12 }

 

1 package com.bluejie.bluej.java.design.chain; 2  3 /** 4  * Created by bluej on 2018/2/1. 5  */ 6 public class ParamaterHandler implements Handler { 7     @Override 8     public void doHandle(Executor executor) { 9         log.info("--ParamaterHandler--");10         executor.doExecutor();11     }12 }

 

1 package com.bluejie.bluej.java.design.chain; 2  3 /** 4  * Created by bluej on 2018/2/1. 5  */ 6 public class ServiceHandler implements Handler { 7     @Override 8     public void doHandle(Executor executor) { 9         log.info("--ServiceHandler--");10         executor.doExecutor();11     }12 }

 

3.珠宝抽象为接口

1 package com.bluejie.bluej.java.design.chain; 2  3 import com.bluejie.bluej.logUtil.LogUtil; 4 import org.slf4j.Logger; 5  6 /** 7  * Created by bluej on 2018/2/1. 8  */ 9 public interface Executor {10     Logger log = LogUtil.instance(Executor.class);11 12     void doExecutor();13 }

 

4.珠宝实现类

1 package com.bluejie.bluej.java.design.chain; 2  3 /** 4  * Created by bluej on 2018/2/1. 5  */ 6 public class ExecutorService implements Executor { 7     @Override 8     public void doExecutor() { 9         log.info("--ExecutorService--");10     }11 }

 

5.执行demo

1 package com.bluejie.bluej.java.design.chain; 2  3  4 import java.util.ArrayList; 5 import java.util.Arrays; 6 import java.util.Collections; 7 import java.util.List; 8  9 /**10  * Created by bluej on 2018/2/1.11  */12 public class ChainDemo {13     private static ChainDemo chainDemo =new ChainDemo();14 15     public static void main(String[] args) {16         chainDemo.execute().doExecutor();17     }18 19     private Executor execute(){20 21         Executor executor = new ExecutorService();22         List
      
        handleList  = new ArrayList<>();23         handleList.add(new LogHandler());24         handleList.add(new ParamaterHandler());25         handleList.add(new ServiceHandler());26         Collections.reverse(handleList);27 28         for (int i = 0 ;i
      

 

6.执行结果

0122018-02-02 00:33:29,270 [main] INFO  com.bluejie.bluej.java.design.chain.Handler.doHandle   - --LogHandler--2018-02-02 00:33:29,276 [main] INFO  com.bluejie.bluej.java.design.chain.Handler.doHandle   - --ParamaterHandler--2018-02-02 00:33:29,276 [main] INFO  com.bluejie.bluej.java.design.chain.Handler.doHandle   - --ServiceHandler--2018-02-02 00:33:29,276 [main] INFO  com.bluejie.bluej.java.design.chain.Executor.doExecutor - --ExecutorService--