动态代理（工厂模式）

接口类

package com.itchen.proxytest;public interface Star {public abstract String sing(String name);public abstract void dance();
}

实体类

package com.itchen.proxytest;public class BigStar implements Star{private String name;public BigStar(String name) {this.name = name;}public BigStar() {}@Overridepublic String sing(String name){System.out.println(this.name + "正在唱" + name);return "蟹蟹";}@Overridepublic void dance(){System.out.println(this.name + "正在跳");}@Overridepublic String toString() {return "BigStar{" +"name='" + name + '\'' +'}';}public String getName() {return name;}public void setName(String name) {this.name = name;}
}

代理类

package com.itchen.proxytest;import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;/*** 类的作用：*      创建一个代理* */
public class ProxyUtil {/*** 为对象创建代理*  形参：被代理的对象*  返回值：代理对象* */public static Star createProxy(BigStar bigStar){/***  参数1：指定类加载器*  参数2：指定接口*  参数3：指定任务* */Star star = (Star)Proxy.newProxyInstance(ProxyUtil.class.getClassLoader(),new Class[]{Star.class},new InvocationHandler() {@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {/*** 参数1：代理的对象* 参数2：代理的方法* 参数3：代理方法的实参* */if("sing".equals(method.getName())){System.out.println("准备话筒");}else if("dance".equals(method.getName())){System.out.println("准备场地");}return method.invoke(bigStar,args);}});return star;}
}

测试类

package com.itchen.proxytest;public class Test {public static void main(String[] args) {BigStar bigStar = new BigStar("鸡哥");Star proxy = ProxyUtil.createProxy(bigStar);String result = proxy.sing("梦回还");proxy.dance();System.out.println(result);}
}