动态代理CGlib实例

1.委托类；

package 动态代理2;

//需要对这个类进行增强



public class UserService {

    

    public void create()

    {

        System.out.println("创建用户");

    }

    public  void update()

    {

        System.out.println("更新用户");

        

    }



}

2.代理类的实现

 1 package 动态代理2;

 2 

 3 import java.lang.reflect.Method;

 4 

 5 import net.sf.cglib.proxy.Enhancer;

 6 import net.sf.cglib.proxy.MethodInterceptor;

 7 import net.sf.cglib.proxy.MethodProxy;

 8 

 9 public class ProxyCglib implements MethodInterceptor{

10     //根据传入的名字来判断是否有操作权限

11     private Enhancer enhancer=new Enhancer();

12     

13     private String name=null;

14     

15     public ProxyCglib(String name)

16     {

17         this.name=name;

18         

19     }

20     //获得代理类的对象，传入参数为委托类

21     public Object getProxy(Class clazz){

22           //设置需要创建子类的类

23           enhancer.setSuperclass(clazz);

24           enhancer.setCallback(this);

25           //通过字节码技术动态创建子类实例

26           return enhancer.create();

27          }

28 

29 

30     

31     public Object intercept(Object arg0, Method arg1, Object[] arg2,

32             MethodProxy arg3) throws Throwable {

33         // TODO Auto-generated method stub

34         

35         if(!name.equals("han"))

36         {

37          System.out.println("权限不足");

38         }

39         else

40         {

41             arg3.invokeSuper(arg0, arg2);

42             

43         }

44         

45         return null;

46     }

47     

48 

49 }

3.客户端：测试

package 动态代理2;

//ref: http://songbo-mail-126-com.iteye.com/blog/968792



public class Test {



    public static void main(String[] args) {

        // TODO Auto-generated method stub

        //为用户张三创建一个代理对象

    /*    

        ProxyCglib proxy=new ProxyCglib("张三");

        UserService user=(UserService) proxy.getProxy(UserService.class);

        user.create(); */

        

        ProxyCglib proxy2=new ProxyCglib("han");

        UserService user2 =(UserService) proxy2.getProxy(UserService.class);

        user2.create();

        

    



    }



}