1 package com.demo.basis.reflect;
2 import java.lang.reflect.*;
3 interface Person
4 {
5 void walk();
6 void sayHello(String name);
7 }
8 /**
9 * 动态代理
10 * @author boco
11 *
12 */
13 class MyInvokationHandler implements InvocationHandler
14 {
15 /*
16 执行动态代理对象的所有方法时，都会被替换成执行如下的invoke方法
17 其中：
18 proxy：代表动态代理对象
19 method：代表正在执行的方法
20 args：代表调用目标方法时传入的实参。
21 */
22 public Object invoke(Object proxy, Method method, Object[] args)
23 {
24 System.out.println("----正在执行的方法:" + method);
25 if (args != null)
26 {
27 System.out.println("下面是执行该方法时传入的实参为：");
28 for (Object val : args)
29 {
30 System.out.println(val);
31 }
32 }
33 else
34 {
35 System.out.println("调用该方法没有实参！");
36 }
37 return null;
38 }
39 }
40 public class ProxyTest
41 {
42 public static void main(String[] args) throws Exception
43 {
44 // 创建一个InvocationHandler对象
45 InvocationHandler handler = new MyInvokationHandler();
46 //使用Proxy生成一个动态代理类proxyClass
47 Class proxyClass = Proxy.getProxyClass(Person.class.getClassLoader(), new Class[]{Person.class});
48 //获取proxyClass中夹带一个参数InvocationHandler的构造器
49 Constructor ctor = proxyClass.getConstructor(new Class[]{InvocationHandler.class});
50 Person p = (Person)ctor.newInstance(new Object[]{handler});
51 // // 使用指定的InvocationHandler来生成一个动态代理对象
52 // Person p = (Person)Proxy.newProxyInstance(Person.class.getClassLoader(), new Class[]{Person.class}, handler);
53 // // 调用动态代理对象的walk()和sayHello()方法
54 p.walk();
55 p.sayHello("孙悟空");
56 }
57 }
public interface Dog {
public void info();
public void run();
}
1 public class GunDog implements Dog {
2 public void info() {
3 System.out.println("我是一只猎狗");
4 }
5 public void run() {
6 System.out.println("我奔跑急速");
7 }
8 }
View Code
1 public class DogUtil {
2 public void method1(){
3 System.out.println("第一个方法");
4 }
5 public void method2(){
6 System.out.println("第二个方法");
7 }
8 }
View Code
1 public class MyInvokationHander implements InvocationHandler {
2 private Object target;
3 public Object invoke(Object obj, Method method, Object[] aobj)throws Throwable {
4 DogUtil du = new DogUtil();
5 du.method1();
6 Object result = method.invoke(target, aobj);
7 du.method2();
8 return result;
9 }
10 public Object getTarget() {
11 return target;
12 }
13 public void setTarget(Object target) {
14 this.target = target;
15 }
16 }
View Code
1 public class MyProxyFactory {
2 public static Object getPorxy(Object target){
3 MyInvokationHander handler = new MyInvokationHander();
4 handler.setTarget(target);
5 return Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), handler);
6 }
7 }
View Code
1 public class ProxyDemo {
2 public static void main(String[] args) {
4 Dog target = new GunDog();
5 Dog dog = (Dog) MyProxyFactory.getPorxy(target);
6 dog.info();
7 dog.run();
8 }
9 }
View Code
