cglib代理学习笔记

1.cglib和静态代理和动态代理的区别?
静态代理和动态代理都需要去实现某个接口，然后才能使用，特别是静态代理，一次只能服务一个类，动态代理好一点，可以服务所有的类，但是还是要实现接口，这样有点烦，但是cglib完美的解决了这个问题，可以强行给某个类加入方法，不需要去实现某个接口

2.如何实现
a.需要加方法的类:

package com.lilei.test.proxytest;/** * Created by Administrator on 2017/9/26. */public class HelloImp1 {    public void say(String name) {        System.out.println("Hello! "+name);    }    public void eat(String name) {        System.out.println("eat "+name);    }}

b.cglib代理类

package com.lilei.test.proxytest;import net.sf.cglib.proxy.Enhancer;import net.sf.cglib.proxy.MethodInterceptor;import net.sf.cglib.proxy.MethodProxy;import java.lang.reflect.Method;/** * Created by Administrator on 2017/9/27. */public class CGlibProxy implements MethodInterceptor{    private static CGlibProxy cGlibProxy;    private CGlibProxy(){    }    public static CGlibProxy getInstance(){        if (cGlibProxy == null){            return new CGlibProxy();        }        return cGlibProxy;    }//    private Object target;////    public CGlibProxy(Object target) {//        this.target = target;//    }    public Object intercept(Object obj, Method method, Object[] args,                            MethodProxy proxy) throws Throwable {        before();        Object result = proxy.invokeSuper(obj,args);        after();        return result;    }    private void before(){        System.out.println("Before");    }    private void after(){        System.out.println("After");    }    /**     * 获取代理     * @param cls     * @param <T>     * @return     */    public <T> T getProxy(Class<?> cls){        Enhancer en = new Enhancer();//工具类        en.setSuperclass(cls);//设置超类        en.setCallback(this);//设置回调函数        return (T) en.create();    }}

c .springDemo.xml配置文件，将cglib代理类和想要服务的类关联起来

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:context="http://www.springframework.org/schema/context"       xsi:schemaLocation="       http://www.springframework.org/schema/beans       http://www.springframework.org/schema/beans/spring-beans.xsd       http://www.springframework.org/schema/beans/aop       http://www.springframework.org/schema/aop/spring-aop-3.1.xsd       http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context.xsd">    <context:component-scan base-package="com.lilei.test.AddviceTest"/>    <bean id="transactionManager" class="com.lilei.test.AddviceTest.GreetingThrowAdvice" />    <bean id="greetingIml" class="com.lilei.test.AddviceTest.GreetingImp" />    <bean id ="greetingIntoAdvice" class="com.lilei.test.AddviceTest.GreetingIntroAdvice" />    <bean id="greetingAroundAdvice" class="com.lilei.test.AddviceTest.GreetingImp" />    <!--<aop:aspectj-autoproxy proxy-target-class="true"/>-->    <!--配置一个切面-->    <bean id="greetingAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">        <property name="advice" ref="greetingIntoAdvice" /> <!--增强-->        <property name="pattern" value="com.lilei.test.AddviceTest.GreetingIntroAdvice.good.*"/><!--正则表达式-->    </bean>    <!--配置一个代理-->    <bean id="greetingProxy" class="org.springframework.aop.framework.ProxyFactoryBean">        <!--<property name="interfaces" value="com.lilei.test.AddviceTest.Apology"/>--><!--需要动态实现的接口-->        <property name="target" ref="greetingIml"/><!--目标类-->        <!--<property name="interceptorNames" value="greetingIntoAdvice" />--><!--引入增强-->       <!-- <property name="interceptorNames" value="greetingAdvisor" />-->        <property name="interceptorNames" value="transactionManager" />        <property name="proxyTargetClass" value="true"/>    </bean></beans>

d.cglib测试类

package com.lilei.test.proxytest;/** * Created by Administrator on 2017/9/28. */public class CGlibProxyTest {    public static void main(String[] args) {//        CGlibProxy cGlibProxy = new CGlibProxy();//        HelloImp1 hello = cGlibProxy.getProxy(HelloImp1.class);        HelloImp1 hello = CGlibProxy.getInstance().getProxy(HelloImp1.class);        hello.say("lieli");        hello.eat("lieli1");    }}