package com.proxy.staticproxy;
public interface SellTicket {
    void sell();
}

package com.proxy.staticproxy;
public class TrainStation implements SellTicket{
     @Override
     public void sell() {
         System.out.println("火車站售票");
     }
 }

package com.proxy.staticproxy;
public class ProxyPoint implements SellTicket{
    //聲明火車類對象
    private TrainStation trainStation = new TrainStation();
    @Override
    public void sell() {
        System.out.println("代售點收取服務費");
        trainStation.sell();
    }
    public static void main(String[] args) {
        ProxyPoint proxyPoint = new ProxyPoint();
        proxyPoint.sell();
    }
}

package com.proxy.jdkproxy;
import com.proxy.staticproxy.SellTicket;
import com.proxy.staticproxy.TrainStation;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
public class ProxyFactory {
    private TrainStation trainStation = new TrainStation();
    public SellTicket getProxyPoint() {
        /**
         * ClassLoader loader: 類加載器，用于加載代理類。可以通過目標對象獲取類加載器
         * Class<?>[] interfaces: 代理類實現(xiàn)的接口的字節(jié)碼對象
         * InvocationHandler h: 代理對象的調用處理程序
         */
        SellTicket sellTicket = (SellTicket)Proxy.newProxyInstance(trainStation.getClass().getClassLoader(), trainStation.getClass().getInterfaces(),
                new InvocationHandler() {
                    /**
                     * @param proxy 代理對象 proxyObject是同一個對象，在invoke方法中基本不用
                     * @param method 對接口中的方法進行封裝的method對象
                     * @param args 調用方法的實際參數(shù)
                     * @return 方法返回值
                     * @throws Throwable
                     */
                    @Override
                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                    	 // 代碼增強
                        System.out.println("代理點收取服務費");
                        Object object = method.invoke(trainStation, args);
                        return object;
                    }
                });
        return sellTicket;
    }
    public static void main(String[] args) {
        ProxyFactory proxyPoint = new ProxyFactory();
        SellTicket sellTicket = proxyPoint.getProxyPoint();
        sellTicket.sell();
    }
}

<!-- 引入cglib依賴包-->
<dependency>
     <groupId>cglib</groupId>
     <artifactId>cglib</artifactId>
     <version>2.2.2</version>
 </dependency>

package com.cglib;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import java.lang.reflect.Method;
public class ProxyFactory implements MethodInterceptor {
    private TrainStation trainStation = new TrainStation();
    public TrainStation getTrainStation(){
        //創(chuàng)建Enhancer對象，類似于JDK代理中的Proxy類
        Enhancer enhancer = new Enhancer();
        //設置父類的字節(jié)碼對象
        enhancer.setSuperclass(TrainStation.class);
        //設置回調函數(shù)
        enhancer.setCallback(this);
        //創(chuàng)建代理對象
        TrainStation trainStation = (TrainStation)enhancer.create();
        return trainStation;
    }
    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
    	// 代碼增強
        System.out.println("代售點收取服務費用");
        Object obj = method.invoke(trainStation, objects);
        return obj;
    }
    public static void main(String[] args) throws Exception {
        ProxyFactory proxyFactory = new ProxyFactory();
        TrainStation trainStation = proxyFactory.getTrainStation();
        trainStation.sell();
    }
}