java动态代理和cglib动态代理示例分享

package testAOP;
public interface Saying {
public void sayHello(String name);   
public void talking(String name);
}

package testAOP;
public class SayingImpl implements Saying {
    @Override
    public void sayHello(String name) {
        // TODO Auto-generated method stub
        System.out.println(name + "：大家好啊！");
    }
    @Override
    public void talking(String name) {
        // TODO Auto-generated method stub
        System.out.println(name + "：我的意思是，我们要努力建设和谐社会！");
    }
}

package testAOP;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class MyInvocationHandler implements InvocationHandler {

    private Object target;
    MyInvocationHandler(Object target){
        this.target = target;
    }
    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        //目标方法前执行
        System.out.println("——————————————————————————");
        System.out.println("下一位请登台发言！");
        //目标方法调用
        Object obj = method.invoke(target, args);
        //目标方法后执行
        System.out.println("大家掌声鼓励！");
        return obj;
    }
}

package testAOP;
import java.lang.reflect.Proxy;
public class JDKProxyTest {

    public static void main(String[] args) {
        // 希望被代理的目标业务类
        Saying target = new SayingImpl();
        // 将目标类和横切类编织在一起
        MyInvocationHandler handler = new MyInvocationHandler(target);
        // 创建代理实例
        Saying proxy = (Saying) Proxy.newProxyInstance(
                target.getClass().getClassLoader(),//目标类的类加载器
                target.getClass().getInterfaces(),//目标类的接口
                handler);//横切类
        proxy.sayHello("小明");
        proxy.talking("小丽");
    }
}

——————————————————————————
下一位请登台发言！
小明：大家好啊！
大家掌声鼓励！
——————————————————————————
下一位请登台发言！
小丽：我的意思是，我们要努力建设和谐社会！
大家掌声鼓励！

package testAOP.cglib;
import java.lang.reflect.Method;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

public class CglibProxy implements MethodInterceptor{

    Enhancer enhancer = new Enhancer();
    public Object getProxy(Class clazz) {
        //设置需要创建的子类
        enhancer.setSuperclass(clazz);
        enhancer.setCallback(this);
        //通过字节码技术动态创建子类实例
        return enhancer.create();
    }
    @Override
    public Object intercept(Object obj, Method method, Object[] args,
            MethodProxy proxy) throws Throwable {
        // TODO Auto-generated method stub
        System.out.println("——————————————————————————");
        System.out.println("下一位请登台发言！");
        //目标方法调用
        Object result = proxy.invokeSuper(obj, args);
        //目标方法后执行
        System.out.println("大家掌声鼓励！");
        return result;
    }   
}

package testAOP.cglib;
import testAOP.Saying;
import testAOP.SayingImpl;
public class CglibProxyTest {

    public static void main(String[] args) {
        CglibProxy proxy = new CglibProxy();
        //通过动态生成子类的方式创建代理类
        Saying target = (Saying) proxy.getProxy(SayingImpl.class);
        target.sayHello("小明");
        target.talking("小丽");
    }
}