//---------接口1------------
package com.itspring.proxy.jdk;

public interface TargetInterface1 {
    void save();
}


//---------接口2------------
package com.itspring.proxy.jdk;

public interface TargetInterface2 {
    void update();
}


//---------接口1,接口2實(shí)現(xiàn)類(目標(biāo)類)------------
package com.itspring.proxy.jdk;

//目標(biāo)類(被增強(qiáng)的類)
public class Target implements TargetInterface1 ,TargetInterface2{
    public void save() {
        System.out.println("save running...");
    }

    public void update() {
        System.out.println("update running...");
    }
}

//---------通知類(方法增強(qiáng)類)------------
package com.itspring.proxy.jdk;

//通知類(增強(qiáng)類)
public class Advice {

    public void before() {
        System.out.println("前置增強(qiáng)...");
    }

    public void afterRunning() {
        System.out.println("后置增強(qiáng)...");
    }
}

//---------測(cè)試代碼------------
package com.itspring.proxy.jdk;

import org.junit.Test;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class ProxyTest {

    @Test
    public void test1() {

        final Target target = new Target();

        final Advice advice = new Advice();

        //返回值就是動(dòng)態(tài)生成的代理對(duì)象
        TargetInterface1 proxy1 = (TargetInterface1) Proxy.newProxyInstance(
                target.getClass().getClassLoader(),  //目標(biāo)類的類加載器
                target.getClass().getInterfaces(),  //目標(biāo)類實(shí)現(xiàn)的接口(可能有多個(gè))
                new InvocationHandler() {
                    //調(diào)用代理對(duì)象的任何方法,實(shí)質(zhì)上都是調(diào)用invoke方法
                    public Object invoke(Object proxy,  //代理對(duì)象
                                         Method method,  //目標(biāo)方法對(duì)象
                                         Object[] args  //目標(biāo)方法的參數(shù)
                    ) throws Throwable {
                        System.out.println("正在執(zhí)行的方法:" + method.getName());
                        advice.before();  //前置增強(qiáng)
                        Object invoke = method.invoke(target, args);  //執(zhí)行目標(biāo)方法
                        advice.afterRunning();  //后置增強(qiáng)
                        return invoke;
                    }
                }
        );

        proxy1.save();

        //返回值就是動(dòng)態(tài)生成的代理對(duì)象
        TargetInterface2 proxy2 = (TargetInterface2) Proxy.newProxyInstance(
                target.getClass().getClassLoader(),  //目標(biāo)類的類加載器
                target.getClass().getInterfaces(),  //目標(biāo)類實(shí)現(xiàn)的接口(可能有多個(gè))
                new InvocationHandler() {
                    //調(diào)用代理對(duì)象的任何方法,實(shí)質(zhì)上都是調(diào)用invoke方法
                    public Object invoke(Object proxy,  //代理對(duì)象
                                         Method method,  //目標(biāo)方法對(duì)象
                                         Object[] args  //目標(biāo)方法的參數(shù)
                    ) throws Throwable {
                        System.out.println("正在執(zhí)行的方法:" + method.getName());
                        advice.before();
                        Object invoke = method.invoke(target, args);  //執(zhí)行目標(biāo)方法
                        advice.afterRunning();
                        return invoke;
                    }
                }
        );

        proxy2.update();
    }
}

//---------目標(biāo)類-------------
package com.itspring.proxy.cglib;

import com.itspring.proxy.jdk.TargetInterface1;
import com.itspring.proxy.jdk.TargetInterface2;

//目標(biāo)類(被增強(qiáng)的類)
public class Target {
    public void save() {
        System.out.println("save running...");
    }

    public void update() {
        System.out.println("update running...");
    }
}

//---------通知類(增強(qiáng)類)-------------
package com.itspring.proxy.cglib;

//通知類(增強(qiáng)類)
public class Advice {

    public void before() {
        System.out.println("前置增強(qiáng)...");
    }

    public void afterRunning() {
        System.out.println("后置增強(qiáng)...");
    }
}

//---------測(cè)試代碼-------------
package com.itspring.proxy.cglib;

import com.itspring.proxy.jdk.TargetInterface1;
import com.itspring.proxy.jdk.TargetInterface2;
import org.junit.Test;
import org.springframework.cglib.proxy.Enhancer;
import org.springframework.cglib.proxy.MethodInterceptor;
import org.springframework.cglib.proxy.MethodProxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class ProxyTest {

    @Test
    public void test1() {
        //目標(biāo)對(duì)象
        final Target target = new Target();

        //增強(qiáng)對(duì)象
        final Advice advice = new Advice();

        //基于cglib生成動(dòng)態(tài)代理對(duì)象
        //1.創(chuàng)建增強(qiáng)器
        Enhancer enhancer = new Enhancer();
        //2.創(chuàng)建父類
        enhancer.setSuperclass(Target.class);
        //3.設(shè)置回調(diào)
        enhancer.setCallback(new MethodInterceptor() {
            public Object intercept(Object proxy,  //代理對(duì)象
                                    Method method,  //目標(biāo)方法
                                    Object[] objects,  //目標(biāo)方法的參數(shù)
                                    MethodProxy methodProxy)  //目標(biāo)方法的代理
                    throws Throwable {
                //前置增強(qiáng)
                advice.before();
                //目標(biāo)方法
                Object invoke = method.invoke(target, objects);
                //后置增強(qiáng)
                advice.afterRunning();
                return invoke;
            }
        });
        //4.生成代理對(duì)象
        Target target1 = (Target) enhancer.create();
        //5.測(cè)試
        target1.save();
        target1.update();

    }
}