设计模式动态代理 cglib(笔记)

最新推荐文章于 2025-08-05 21:06:40 发布

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最新推荐文章于 2025-08-05 21:06:40 发布 · 210 阅读

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#设计模式 #java

本文详细介绍了Java中CGLIB库的工作原理和使用，包括CGLIB生成的代理类结构，以及如何通过CGLIB实现方法拦截，增强原有功能。

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public class Station {
    public void sellTicket(){
        System.out.println("已经卖出");
    }
}

public class ProxyFactory implements MethodInterceptor {
    private Station station = new Station();
    public Station getStation(){
        //创建enhancer对象，类似于Proxy
        Enhancer enhancer = new Enhancer();
        //传入要被动态代理的类
        enhancer.setSuperclass(Station.class);
        //设置回调函数，传入对象要实现 MethodInterceptor
        enhancer.setCallback(this);
        //创建匿名内部类继承setSuperClass()传入的类
        Station station1 =(Station) enhancer.create();
        return station1;
    }

    @Override
    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
        System.out.println("已经收取手续费");
        Object result = method.invoke(station, objects);
        System.out.println("打印结果");
        return result;
    }
}

public class Client {
    public static void main(String[] args) {
        //创建代理工厂
        ProxyFactory proxyFactory = new ProxyFactory();
        //获取继承Station的匿名内部类
        Station station = proxyFactory.getStation();
        //调用sellTicket()
        station.sellTicket();
        //获得匿名匿名内部类的class文件名
        System.out.println(station.getClass());
        while (true){

        }
    }
}

public class Station$$EnhancerByCGLIB$$6977634a
extends Station
implements Factory {
private boolean CGLIB$BOUND;
private static final ThreadLocal CGLIB$THREAD_CALLBACKS;
private static final Callback[] CGLIB$STATIC_CALLBACKS;
private MethodInterceptor CGLIB$CALLBACK_0;
private static final Method CGLIB$sellTicket$0$Method;
private static final MethodProxy CGLIB$sellTicket$0$Proxy;
private static final Object[] CGLIB$emptyArgs;
private static final Method CGLIB$finalize$1$Method;
private static final MethodProxy CGLIB$finalize$1$Proxy;
private static final Method CGLIB$equals$2$Method;
private static final MethodProxy CGLIB$equals$2$Proxy;
private static final Method CGLIB$toString$3$Method;
private static final MethodProxy CGLIB$toString$3$Proxy;
private static final Method CGLIB$hashCode$4$Method;
private static final MethodProxy CGLIB$hashCode$4$Proxy;
private static final Method CGLIB$clone$5$Method;
private static final MethodProxy CGLIB$clone$5$Proxy;

public Station$$EnhancerByCGLIB$$6977634a() {
Station$$EnhancerByCGLIB$$6977634a station$$EnhancerByCGLIB$$6977634a = this;
Station$$EnhancerByCGLIB$$6977634a.CGLIB$BIND_CALLBACKS(station$$EnhancerByCGLIB$$6977634a);
}

static {
Station$$EnhancerByCGLIB$$6977634a.CGLIB$STATICHOOK1();
}

protected final void finalize() throws Throwable {
MethodInterceptor methodInterceptor = this.CGLIB$CALLBACK_0;
if (methodInterceptor == null) {
Station$$EnhancerByCGLIB$$6977634a.CGLIB$BIND_CALLBACKS(this);
methodInterceptor = this.CGLIB$CALLBACK_0;
}
if (methodInterceptor != null) {
Object object = methodInterceptor.intercept(this, CGLIB$finalize$1$Method, CGLIB$emptyArgs, CGLIB$finalize$1$Proxy);
return;
}
super.finalize();
}