基于Cglib的动态代理

由于JDK只能基于接口进行动态代理，所以Spring使用JDK和Cglib结合使用来产生动态代理，Cglib可以进行类的动态代理

 

下面就是一个简单的动态代理例子：

被代理的类

package com.lbx.dog;


public class Dog {

	public void info() {
		// TODO Auto-generated method stub
		System.out.println("这是一只狗");
	}

	public void run() {
		// TODO Auto-generated method stub
		System.out.println("这只狗在RUN");
	}

}

 

 

类似与拦截器的拦截方法

package com.lbx.proxy;

public class DogInterceptor {

	public void method1(){
		System.out.println("第一个拦截方法");
	}
	
	public void method2(){
		System.out.println("第二个拦截方法");
	}
	
}

 

 

 

代理对象的实现

package com.lbx.proxy;

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 {

	private Enhancer enhancer = new Enhancer();
	DogInterceptor di = new DogInterceptor();
	
	public CglibProxy(){
	}
	
	public Object getProxy(Class c){
		enhancer.setSuperclass(c);
		enhancer.setCallback(this);
		return enhancer.create();
	}
	
	public Object intercept(Object obj, Method method, Object[] args,
			MethodProxy proxy) throws Throwable {
		di.method1();
		Object result = proxy.invokeSuper(obj, args);
		di.method2();
		return result;
	}

}

 

 

测试程序

package com.lbx.test;

import com.lbx.dog.Dog;
import com.lbx.proxy.CglibProxy;


public class Test {

	public static void main(String[] args) {
		
		CglibProxy proxy = new CglibProxy();
		Dog proxyDog = (Dog)proxy.getProxy(Dog.class);
		proxyDog.info();
		proxyDog.run();
		
	}
	
}