java中的PropertyChangeSupport与PropertyChangeListener配合使用能够实现，绑定属性会在属性值发生变化时，通知所有相关的监听器。
javaBean：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
package com.wang.test.property; import java.beans.PropertyChangeListener; import java.beans.PropertyChangeSupport; public class TestBean { protected final PropertyChangeSupport support = new PropertyChangeSupport(this); private String str; public String getStr() { return str; } public void setStr(String str) { support.firePropertyChange("str", this.str, str); this.str = str; } public void addPropertyChangeListener(PropertyChangeListener listener) { support.addPropertyChangeListener(listener); } public void removePropertyChangeListener(PropertyChangeListener listener) { support.removePropertyChangeListener(listener); } } |
client：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
package com.wang.test.property; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; public class PropertyChangeSupportTest { public static void main(String[] args) { TestBean test = new TestBean(); test.setStr("ddddd"); test.addPropertyChangeListener(new PropertyChangeListener1()); test.setStr("yyyy"); //test.addPropertyChangeListener(new PropertyChangeListener2()); //test.setStr("hhhhhhf"); } public static class PropertyChangeListener1 implements PropertyChangeListener{ @Override public void propertyChange(PropertyChangeEvent evt) { System.out.println( "1: " + evt.getPropertyName() + " " + evt.getNewValue() + " " + evt.getOldValue()); } } public static class PropertyChangeListener2 implements PropertyChangeListener{ @Override public void propertyChange(PropertyChangeEvent evt) { System.out.println( "2: " + evt.getPropertyName() + " " + evt.getNewValue() + " " + evt.getOldValue()); } } } |
执行PropertyChangeSupportTest 该类的mian方法
1:未打开注释的输出结果:
1: str yyyy ddddd
2:打开注释的输出结果:
1: str yyyy ddddd
1: str hhhhhhf yyyy
2: str hhhhhhf yyyy