Java-马士兵设计模式学习笔记-观察者模式-读取properties文件改成单例模式

一、概述

1.目标：读取properties文件改成单例模式

 

二、代码

1.Test.java

  1 class WakenUpEvent{

  2     

  3     private long time;

  4     private String location;

  5     private Child source;

  6     

  7     public WakenUpEvent(long time, String location, Child source) {

  8         super();

  9         this.time = time;

 10         this.location = location;

 11         this.source = source;

 12     }

 13 

 14     public long getTime() {

 15         return time;

 16     }

 17 

 18     public void setTime(long time) {

 19         this.time = time;

 20     }

 21 

 22     public String getLocation() {

 23         return location;

 24     }

 25 

 26     public void setLocation(String location) {

 27         this.location = location;

 28     }

 29 

 30     public Child getSource() {

 31         return source;

 32     }

 33 

 34     public void setSource(Child source) {

 35         this.source = source;

 36     }

 37     

 38     

 39 }

 40 

 41 class Child implements Runnable {

 42     

 43     private List<WakenUpListener> wakenUpListeners = new ArrayList<WakenUpListener>();

 44     

 45     public void addWakenUpListener(WakenUpListener wul){

 46         wakenUpListeners.add(wul);

 47     }

 48     public void wakeUp(){

 49         for(int i = 0; i < wakenUpListeners.size(); i++){

 50             WakenUpListener l = wakenUpListeners.get(i);

 51             l.actionToWakenUp(new WakenUpEvent(System.currentTimeMillis(), "bed", this));

 52         }

 53     }

 54 

 55     @Override

 56     public void run() {

 57         try {

 58             Thread.sleep(3000);

 59         } catch (Exception e) {

 60             e.printStackTrace();

 61         }

 62         wakeUp();

 63     }

 64 }

 65 

 66 

 67 interface WakenUpListener {

 68     public void actionToWakenUp(WakenUpEvent e);

 69 }

 70 

 71 class Dad implements WakenUpListener {

 72 

 73     public void actionToWakenUp(WakenUpEvent e) {

 74         System.out.println("Fedd the child");

 75     }

 76     

 77 }

 78 

 79 class GrandFather implements WakenUpListener {

 80 

 81     public void actionToWakenUp(WakenUpEvent e) {

 82         System.out.println("抱孩子");

 83     }

 84     

 85 }

 86 

 87 class PropertiesMgr{

 88     

 89     private static Properties props = new Properties();

 90     

 91     //只加载一次，但如果properties有更新，它不会反馈

 92     static {

 93         try {

 94             props.load(Test.class.getClassLoader().getResourceAsStream("com/tong/observer/observer.properties"));

 95         } catch (Exception e) {

 96             e.printStackTrace();

 97         }

 98     }

 99 

100     public static String getProperty(String key){

101         return  props.getProperty(key);

102     }

103 }

104 public class Test {

105 

106     public static void main(String[] args) {

107         

108         Child c = new Child();

109         

110         String [] observers = PropertiesMgr.getProperty("observers").split(",");

111         

112         for(String s : observers){

113             try {

114                 c.addWakenUpListener((WakenUpListener)Class.forName(s).newInstance());

115             } catch (Exception e) {

116                 e.printStackTrace();

117             }

118         }

119         new Thread(c).start();

120     }

121 }

 

三、运行结果