支持 JDK 动态代理

[guxingke]

通过测试案例

interface Interface {
  void doSomething();
  void somethingElse(String arg);
}

class RealObject implements Interface {
  @Override
  public void doSomething() {
    System.out.println("doSomething");
  }
  @Override
  public void somethingElse(String arg) {
    System.out.println("somethingElse " + arg);
  }
}


class DynamicProxyHandler implements InvocationHandler {
  private Object proxied;
  DynamicProxyHandler(Object proxied) {
    this.proxied = proxied;
  }
  @Override
  public Object
  invoke(Object proxy, Method method, Object[] args)
  throws Throwable {
    System.out.println(
      "**** proxy: " + proxy.getClass() +
      ", method: " + method + ", args: " + args);
    if(args != null)
      for(Object arg : args)
        System.out.println("  " + arg);
    return method.invoke(proxied, args);
  }
}

class SimpleDynamicProxy {
  public static void consumer(Interface iface) {
    iface.doSomething();
    iface.somethingElse("bonobo");
  }
  public static void main(String[] args) {
    RealObject real = new RealObject();
    consumer(real);
    // Insert a proxy and call again:
    Interface proxy = (Interface)Proxy.newProxyInstance(
      Interface.class.getClassLoader(),
      new Class[]{ Interface.class },
      new DynamicProxyHandler(real));
    consumer(proxy);
  }
}

=>

doSomething
somethingElse bonobo
SimpleProxy doSomething
doSomething
SimpleProxy somethingElse bonobo
somethingElse bonobo