cglib-aop

 

//cglib代理

通过cglib创建代理类,好处是不要求我们的目标对象实现接口

 

1 准备架包

  asm.jar

  cglib.jar

 

2 man(要代理的对象)的编写

package com.aop.cglib;

public class Man {

private String name;

public Man()

{

}

public Man(String name)

{

this.name = name;

}

public void addMan()

{

System.out.println("add Man");

}

public void deltMan()

{

System.out.println("delete Man");

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

}

 

 

3 代理工厂CglibProxy的编写

 

package com.aop.cglib;

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 Object o;

/**

* 创建要代理的对象，并返回

* @param o

* @return

*/

public Object crateProxyObject(Object o)

{

this.o = o;

Enhancer eh = new Enhancer();

eh.setSuperclass(o.getClass());

eh.setCallback(this);

return eh.create();

}

@Override

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

MethodProxy arg3) throws Throwable {

// TODO Auto-generated method stub

Man man = (Man)o;

String name = man.getName();

Object result = "none";

if(name != null && !name.equals(""))

{

result = arg3.invoke(o, arg2);

}

System.out.println("result:"+result);

return result;

}

}

 

 

4 测试类TestProxy的编写

 

package com.aop.cglib;

 

public class TestProxy {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

CglibProxy c = new CglibProxy();

Man man = (Man)c.crateProxyObject(new Man("1"));

man.addMan();

man.deltMan();

}

}

 

5 总结

根据程序可知：

如果man对象的name为空，则man的方法被拦截，不会执行

如果man对象的name不为空，则arg3.invoke(o, arg2)方法执行