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();
        
    

    }

}