java动态代理DynamicProxy
发布时间：2010/12/4 22:59:41 来源：城市学习网 编辑：ziteng
1.被代理对象的接口:
1 package test.dynamicproxy;
2
3 public interface TargetInterface {
4 public void SayHello();
5 public int sum(int a ,int b);
6 }
2.被代理的对象:
01 package test.dynamicproxy;
02
03 public class Target implements TargetInterface {
04
05 public void SayHello(){
06 System.out.println("Hello");
07 }
08 public int sum(int a, int b) {
09 return a+b;
10 }
11 }
3.InvocationHandler包装:
01 package test.dynamicproxy;
02
03 import java.lang.reflect.InvocationHandler;
04 import java.lang.reflect.Method;
05
06 public class TargetInvocationHandler implements InvocationHandler {
07
08 private Object object;
09 public TargetInvocationHandler(Object obj){
10 this.object=obj;
11 }
12
13 public Object invoke(Object proxy, Method method, Object[] args2)
14 throws Throwable
15 {
16 doBefore();
17 Object result = method.invoke(object, args2);
18 doAfter();
19 return result;
20 }
21
22 public void doBefore(){
23 System.out.println("do before");
24 }
25
26 public void doAfter(){
27 System.out.println("do after");
28 }
29 }
4.测试类:
01 package test.dynamicproxy;
02
03 import java.lang.reflect.Proxy;
04
05 public class TestDynamicProxy {
06
07 /**
08 * @param args
09 */
10 public static void main(String[] args) {
11 Target t=new Target();
12 TargetInvocationHandler handler=new TargetInvocationHandler(t);
13
14 TargetInterface proxy = (TargetInterface) Proxy.newProxyInstance(
15 t.getClass().getClassLoader(),
16 t.getClass().getInterfaces(),
17 handler);
18
19 proxy.SayHello();
20
21 int b=proxy.sum(10, 20);
22 System.out.println(b);
23 }
24
25 }
