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

 package 动态代理2;

 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 ProxyCglib implements MethodInterceptor{
     //根据传入的名字来判断是否有操作权限
     private Enhancer enhancer=new Enhancer();

     private String name=null;

     public ProxyCglib(String name)
     {
         this.name=name;

     }
     //获得代理类的对象，传入参数为委托类
     public Object getProxy(Class clazz){
           //设置需要创建子类的类
           enhancer.setSuperclass(clazz);
           enhancer.setCallback(this);
           //通过字节码技术动态创建子类实例
           return enhancer.create();
          }

     public Object intercept(Object arg0, Method arg1, Object[] arg2,
             MethodProxy arg3) throws Throwable {
         // TODO Auto-generated method stub

         if(!name.equals("han"))
         {
          System.out.println("权限不足");
         }
         else
         {
             arg3.invokeSuper(arg0, arg2);

         }

         return null;
     }

 }

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();

    }

}