7. Test.java源码package demo;
public interface Test {
public void sayHello(String name);
}
8. TestImpl.java源码package demo;
public class TestImpl implements Test {
public void sayHello(String name) {
System.out.println("Hello "+name);
}
}
9. TestProxy.java源码(注意红色斜体)package demo;
import java.lang.reflect.*;
public class TestProxy implements InvocationHandler {
Test iTest = null;
public TestProxy(Test test) { this.iTest = test; }
public Test getTest(){
return(Test)Proxy.newProxyInstance(iTest.getClass().getClassLoader(),
iTest.getClass().getInterfaces(),this);
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable
{
System.out.println("Before invoke sayHello(\""+args[0]+"\")");
Object rst = method.invoke(iTest,args);
System.out.println("After invoke sayHello(\""+args[0]+"\")");
return rst;
}
}
10. Tester.java源码package demo;
public class Tester {
public static void main(String[] args) {
getTest1().sayHello("JAVA接口代理");
System.out.println("====================");
getTest2().sayHello("JAVA接口代理");
}
private static Test getTest1(){
return new TestImpl();
}
private static Test getTest2(){
return new TestProxy(new TestImpl()).getTest();
} }
11. 执行结果！Hello JAVA接口代理
====================
Before invoke sayHello("JAVA接口代理")
Hello JAVA接口代理
After invoke sayHello("JAVA接口代理")其中红色为函数接管后(TestProxy)加入的打印信息！
