动态代理

import java.lang.reflect.InvocationHandler;
 import java.lang.reflect.Method;
 import java.lang.reflect.Proxy;
 //创建动态代理的服务类
 public class RenterService {
     public static Object getService(Object target) {
         return new RenterInvocationHandler(target).getProxy();
     }
 }
 //内部类完成动态代理功能
 class RenterInvocationHandler implements InvocationHandler {
     private Object target;
     public RenterInvocationHandler(Object target) {
         this.target = target;
     }
 ?
     @Override
     public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
         System.out.println("===中介进入===");
         Object result = method.invoke(target, args);
         System.out.println(result);
         System.out.println("===开始帮租户找房子！===");
         return result;
     }
 ?
     public Object getProxy() {
         return Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), this);
     }
 }

@Test
 void contextLoads() {
     Renter renter=new Renter();
     //通过动态代理获取对象
     Rent rent= (Rent) RenterService.getService(renter);
     String res = rent.rent("通过动态代理，调用方法，获取结果");
 }