How to implement CGLIB dynamic proxy in java

1. Description

CGLIB is a powerful, high-performance code generation package. It provides proxies for classes that do not implement interfaces and provides a good complement to the JDK's dynamic proxy.

CGLIB is a package provided by a third party, so the coordinates of the jar package need to be introduced:

2, Example

public class HelloWorld {
    public static void main(String[] args) {
        // 创建代理工厂对象
        ProxyFactory factory = new ProxyFactory();
        
        // 获取代理对象
        TrainStation proxyObject = factory.getProxyObject();
        
        proxyObject.sell();
    }
}
 
// 火车站，火车站具有卖票功能
class TrainStation {
    public void sell() {
        System.out.println("火车站卖票");
    }
}
 
// 代理工厂
public class ProxyFactory implements MethodInterceptor {
    private TrainStation target = new TrainStation();
 
    public TrainStation getProxyObject() {
        // 创建Enhancer对象，类似于JDK动态代理的Proxy类，下一步就是设置几个参数
        Enhancer enhancer = new Enhancer();
        
        // 设置父类的字节码对象
        enhancer.setSuperclass(target.getClass());
        
        // 设置回调函数
        enhancer.setCallback(this);
        
        // 创建代理对象
        TrainStation obj = (TrainStation) enhancer.create();
        
        return obj;
    }
    
    public TrainStation intercept(Object o, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
        /**
         * intercept方法参数说明：
         *  o：代理对象
         *  method：真实对象中的方法的Method实例
         *  args：实际参数
         *  methodProxy：代理对象中的方法的method实例
         */
        
        System.out.println("代理点收取一些服务费用（CGLIB动态代理）");
        
        TrainStation result = (TrainStation) methodProxy.invokeSuper(o, args);
        
        return result;
    }
}

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