cglib實作動态代理

使用位元組碼生成庫（CGlib）實作動态代理。

1.導入cglib.jar和asm.jar包

2.建立UserService接口和實作類UserServiceImpl

3.建立代理類并實作MethodInterceptor接口

package com.spring.AOPTest;

import java.lang.reflect.Method;

import net.sf.cglib.proxy.Enhancer;

import net.sf.cglib.proxy.MethodInterceptor;

import net.sf.cglib.proxy.MethodProxy;

//使用CGlib（位元組碼生成庫）實作動态代理

public class CGProxy implements MethodInterceptor{

private Object target;//被代理對象

public CGProxy(Object target) {
	// TODO Auto-generated constructor stub
	this.target = target;
}
@Override
public Object intercept(Object arg0, Method arg1, Object[] arg2, MethodProxy proxy) throws Throwable {
	// TODO Auto-generated method stub
	System.out.println("before advisor......");
	Object result = proxy.invokeSuper(arg0, arg2);
	System.out.println("after advisor......");
	
	return result;
}

public Object getProxyObject() {
	Enhancer enHancer = new Enhancer();
	enHancer.setSuperclass(this.target.getClass());//設定父類
	//設定回調
	enHancer.setCallback(this);
	//建立代理對象
	return enHancer.create();
}
           

}

4.編寫測試類

package com.spring.AOPTest;

import org.junit.Test;

public class GCProxyTest {

@Test
public void testGCLib() {
	
	Object proxyObject = new UserServiceImpl();
	CGProxy cg = new CGProxy(proxyObject);
	UserService us = (UserService)cg.getProxyObject();
	us.createUser();
}
           

}

結果如下：

before advisor…

添加一個新的使用者

after advisor…