public interface MethodInterface { String helloWorld(); }

public class MethodProxy<T> implements InvocationHandler {
  private Class<T> methodInterface;
  public MethodProxy(Class<T> methodInterface) {
    this.methodInterface = methodInterface;
  }
  @Override
  public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    System.out.println("=========================");
    System.out.println("方法名:" + method.getName());
    //针对不同的方法进行不同的操作
    return null;
  }
}

public class MethodProxyFactory {
  public static <T> T newInstance(Class<T> methodInterface) {
    final MethodProxy<T> methodProxy = new MethodProxy<T>(methodInterface);
    return (T) Proxy.newProxyInstance(
        Thread.currentThread().getContextClassLoader(), 
        new Class[]{methodInterface}, 
        methodProxy);
  }
}

MethodInterface method = MethodProxyFactory.newInstance(MethodInterface.class);
method.helloWorld();