動態(tài)代理比起靜態(tài)代理方便的多，但是jdk動態(tài)代理實現(xiàn)必須通過接口，如果要代理一個沒有接口的類jdk動態(tài)就無法實現(xiàn)了，這個時候就要借助CGlib這個類庫來動態(tài)生成代理類(spring hibernate框架都使用了該類庫，使用前要先導(dǎo)入)

package proxy;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

import java.lang.reflect.Method;


public class CGlibProxy implements MethodInterceptor {

    public <T> T getProxy(Class<T> tClass) {
        return (T) Enhancer.create(tClass, this);
    }

    @Override
    public Object intercept(Object object, Method method, Object[] args, MethodProxy proxy) throws Throwable {
        before();
        Object result = proxy.invokeSuper(object, args);
        after();
        return result;
    }

    public void before() {
        System.out.println("before");
    }

    public void after() {
        System.out.println("after");
    }

    public static void main(String[] args) {
        CGlibProxy cGlibProxy = new CGlibProxy();
        Hello helloProxy = cGlibProxy.getProxy(Hello.class);
        helloProxy.sayHello("world");
    }
}

關(guān)于Hello類:

package proxy;


public class Hello {

    public void sayHello(String name) {
        System.out.println("hello " + name);
    }
}