package com.atguigu.java;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
* 动态代理的举例
*/
interface Human {
String getBelief();
void eat(String food);
}
//被代理类
class SuperMan implements Human {
@Override
public String getBelief() {
return "I believe I can fly!";
}
@Override
public void eat(String food) {
System.out.println("我喜欢吃" + food);
}
}
//代理类
class ProxyFactory{
//调用此方法，返回一个代理类的对象
public static Object getProxyInstance(Object object){//被代理类的对象
MyInvocationHandler handler = new MyInvocationHandler();
handler.bind(object);
return Proxy.newProxyInstance(object.getClass().getClassLoader(),
object.getClass().getInterfaces(),handler);
}
}
class MyInvocationHandler implements InvocationHandler{
private Object object;//需要使用被代理类的对象进行赋值
public void bind(Object object){
this.object = object;
}
//当我们通过代理类的对象，调用方法a时，就会自动的调用如下的方法:invoke()
//将被代理类要执行的方法a的功能就声明在invoke()中
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
//method:即为代理类对象调用的方法，此方法也就作为了被代理对象要调用的方法
//obj:被代理类的对象
Object returnValue = method.invoke(object, args);
//上述方法的返回值就作为当前类中的invoke()的返回值
return returnValue;
}
}
public class ProxyTest {
public static void main(String[] args) {
SuperMan superMan = new SuperMan();
//proxyInstance:代理对象
Human proxyInstance = (Human) ProxyFactory.getProxyInstance(superMan);
String belief = proxyInstance.getBelief();
System.out.println(belief);
proxyInstance.eat("四川麻辣烫");
System.out.println("**********");
NikeClothFactory nike = new NikeClothFactory();
ClothFactory proxyInstance1 = (ClothFactory) ProxyFactory.getProxyInstance(nike);
proxyInstance1.produceCloth();
}
}
package com.atguigu.java;
/**
* 静态代理举例
*
* 特点：代理类和被带代理类在编译期间，就确定下来了
*
*/
interface ClothFactory{
void produceCloth();
}
//代理类
class ProxyClothFactory implements ClothFactory{
private ClothFactory factory;//用被代理类对象进行实例化
public ProxyClothFactory(ClothFactory factory){
this.factory = factory;
}
@Override
public void produceCloth() {
System.out.println("代理工厂做一些准备工作");
factory.produceCloth();
System.out.println("代理工厂做一些后续的收尾工作");
}
}
//被代理类
class NikeClothFactory implements ClothFactory{
@Override
public void produceCloth() {
System.out.println("Nike工厂生产一批运动服");
}
}
public class StaticProxyTest {
public static void main(String[] args) {
//创建被代理类的对象
NikeClothFactory nike = new NikeClothFactory();
//创建代理类对象
ProxyClothFactory proxyClothFactory = new ProxyClothFactory(nike);
proxyClothFactory.produceCloth();
}
}
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