package com.lf.shejimoshi.proxy.entity;
//用户管理接口
public interface UserManager {//新增用户抽象方法void addUser(String userName,String password);//删除用户抽象方法void delUser(String userName);}

package com.lf.shejimoshi.proxy.entity;
//用户管理实现类,实现用户管理接口
public class UserManagerImpl implements UserManager{//重写新增用户方法
    @Overridepublic void addUser(String userName, String password) {System.out.println("调用了新增的方法！");System.out.println("传入参数为 userName: "+userName+" password: "+password);}//重写删除用户方法
    @Overridepublic void delUser(String userName) {System.out.println("调用了删除的方法！");System.out.println("传入参数为 userName: "+userName);}}

package com.lf.shejimoshi.proxy.jdk;import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;import com.lf.shejimoshi.proxy.entity.UserManager;
import com.lf.shejimoshi.proxy.entity.UserManagerImpl;
//JDK动态代理实现InvocationHandler接口
public class JdkProxy implements InvocationHandler {private Object target ;//需要代理的目标对象
    @Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {System.out.println("JDK动态代理，监听开始！");Object result = method.invoke(target, args);System.out.println("JDK动态代理，监听结束！");return result;}//定义获取代理对象方法private Object getJDKProxy(Object targetObject){//为目标对象target赋值this.target = targetObject;//JDK动态代理只能针对实现了接口的类进行代理，newProxyInstance 函数所需参数就可看出return Proxy.newProxyInstance(targetObject.getClass().getClassLoader(), targetObject.getClass().getInterfaces(), this);}public static void main(String[] args) {JdkProxy jdkProxy = new JdkProxy();//实例化JDKProxy对象UserManager user = (UserManager) jdkProxy.getJDKProxy(new UserManagerImpl());//获取代理对象user.addUser("admin", "123123");//执行新增方法
    }}

package com.lf.shejimoshi.proxy.cglib;import java.lang.reflect.Method;import com.lf.shejimoshi.proxy.entity.UserManager;
import com.lf.shejimoshi.proxy.entity.UserManagerImpl;import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;//Cglib动态代理，实现MethodInterceptor接口
public class CglibProxy implements MethodInterceptor {private Object target;//需要代理的目标对象//重写拦截方法
    @Overridepublic Object intercept(Object obj, Method method, Object[] arr, MethodProxy proxy) throws Throwable {System.out.println("Cglib动态代理，监听开始！");Object invoke = method.invoke(target, arr);//方法执行，参数：target 目标对象 arr参数数组System.out.println("Cglib动态代理，监听结束！");return invoke;}//定义获取代理对象方法public Object getCglibProxy(Object objectTarget){//为目标对象target赋值this.target = objectTarget;Enhancer enhancer = new Enhancer();//设置父类,因为Cglib是针对指定的类生成一个子类，所以需要指定父类
        enhancer.setSuperclass(objectTarget.getClass());enhancer.setCallback(this);// 设置回调 Object result = enhancer.create();//创建并返回代理对象return result;}public static void main(String[] args) {CglibProxy cglib = new CglibProxy();//实例化CglibProxy对象UserManager user =  (UserManager) cglib.getCglibProxy(new UserManagerImpl());//获取代理对象user.delUser("admin");//执行删除方法
    }}