设计模式之GOF23代理模式03

动态代理

public class StarHandler implements InvocationHandler{
  Star realStar;
 public StarHandler(Star realStar) {
   this.realStar = realStar;
  }

 @Override
 public Object invoke(Object proxy, Method method, Object[] args)
   throws Throwable {
  Object obj=null;
  System.out.println("面谈");
  System.out.println("签合同");
  //核心代码
  if(method.getName().equals("sing"))
  {
   obj=method.invoke(realStar, args);
  }
  System.out.println("收尾款");
  return obj;
 }

}

public interface Star {
 /**
  * 面谈
  */
  void confer();
  /**
   * 签合同
   */
  void signContract();
  /**
   * 唱歌
   */
  void sing();
  /**
   * 收尾款
   */
  void coleectMoney();
}

public class RealStar implements Star {
  private String name;
  
 public RealStar(String name) {
   this.name = name;
  }
 @Override
 public void sing() {
  System.out.println(this.name +"唱歌");
 }
 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }
 @Override
 public void confer() {
System.out.println("RealStar.confer()");  
 }
 @Override
 public void signContract() {
System.out.println("RealStar.signContract()");  
 }
 @Override
 public void coleectMoney() {
System.out.println("RealStar.coleectMoney()");  
 }

}

public class Client {
  public static void main(String[] args) {
   Star realStar =new RealStar("Jay");
   StarHandler handler=new StarHandler(realStar);
   Star proxy=(Star) Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(), new Class[] {Star.class},handler );
      proxy.sing();
  }
}

解析动态代理过程