java动态代理的一个例子
2007-06-06 13:39
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动态代理是轻量级容器实现AOP拦截的一种主要方式。
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IAandB.java
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public interface IAandB ...{
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public void doSomething();
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}
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A.java
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public class A implements IAandB...{
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public void doSomething() ...{
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System.out.println("A.a();");
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}
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}
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B.java
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public class B implements IAandB...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
public void doSomething() ...{
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System.out.println("B.b();");
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}
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}
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Handler.java
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.Method;
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public class Handler implements InvocationHandler ...{
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private IAandB ab;
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public Handler(IAandB ab) ...{
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this.ab = ab;
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}
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public Object invoke(Object proxy, Method method, Object[] args)
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throws Throwable ...{
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Object obj = method.invoke(ab,args);
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return obj;
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}
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}
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Test1.java 测试类代码
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.Proxy;
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public class Test1 ...{
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public static void main(String[] args) ...{
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IAandB ab = new A();
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try ...{
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InvocationHandler ds = new Handler(ab);
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IAandB ab1 = (IAandB) Proxy.newProxyInstance(ab.getClass()
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.getClassLoader(), ab.getClass().getInterfaces(), ds);
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ab1.doSomething();
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} catch (Exception e) ...{
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e.printStackTrace();
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}
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}
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}
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IAandB.java
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public interface IAandB ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
public void doSomething();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockEnd.gif)
}
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A.java
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public class A implements IAandB...{
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![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
public void doSomething() ...{
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System.out.println("A.a();");
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
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}
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B.java
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public class B implements IAandB...{
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![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
public void doSomething() ...{
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System.out.println("B.b();");
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}
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}
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Handler.java
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import java.lang.reflect.InvocationHandler;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
import java.lang.reflect.Method;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
public class Handler implements InvocationHandler ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
private IAandB ab;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
public Handler(IAandB ab) ...{
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this.ab = ab;
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}
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
public Object invoke(Object proxy, Method method, Object[] args)
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![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
throws Throwable ...{
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Object obj = method.invoke(ab,args);
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return obj;
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}
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}
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Test1.java 测试类代码
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![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
import java.lang.reflect.InvocationHandler;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
import java.lang.reflect.Proxy;
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedBlock.gif)
public class Test1 ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
public static void main(String[] args) ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IAandB ab = new A();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
try ...{
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
InvocationHandler ds = new Handler(ab);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
IAandB ab1 = (IAandB) Proxy.newProxyInstance(ab.getClass()
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
.getClassLoader(), ab.getClass().getInterfaces(), ds);
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
ab1.doSomething();
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/InBlock.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ContractedSubBlock.gif)
} catch (Exception e) ...{
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e.printStackTrace();
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}
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}
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}
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