开发笔记:Spring面试

public class CglibMeipo implements MethodInterceptor {
public Object getInstance(Class clazz) throws Exception {
Enhancer enhancer = new Enhancer();
//要把clazz设置为即将生成的新类父类
enhancer.setSuperclass(clazz);
enhancer.setCallback(this);
return enhancer.create();
}
@Override
public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
System.out.println("我是媒婆：我要给你找对象，已经拿到你的需求");
System.out.println("开始物色");
methodProxy.invokeSuper(o,objects);
System.out.println("如果合适的话，准备办事");
return null;
}
}

public class JdkMeipo implements InvocationHandler {
//把被代理的对象保存下来
private Person target;
public Object getInstance(Person target) throws Exception{
this.target = target;
// Class clazz = Class.forName(this.target.getClass().getName());
Class clazz = target.getClass();
return Proxy.newProxyInstance(clazz.getClassLoader(),clazz.getInterfaces(),this);
//loader:Proxy.newProxyInstance的三个参数分别代表什么
//interfaces:用哪个类加载器去加载类对象
//h:动态代理方法执行时，会调用h里面的invoke方法去执行
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
System.out.println("我是媒婆：我要给你找对象，现在已经拿到你的需求");
System.out.println("开始物色");
method.invoke(this.target,args);
System.out.println("如果合适的话，就准备办事");
return null;
}
}