public class UserServiceImpl implements UserService {
    @Override
    public void add() {
        // TODO Auto-generated method stub
        System.out.println("--------------------add----------------------");
    }
}

public class MyInvocationHandler implements InvocationHandler {
    private Object target;

    public MyInvocationHandler(Object target) {
        super();
        this.target = target;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
         // 在方法調(diào)用前進行性能監(jiān)控
        PerformanceMonior.begin(target.getClass().getName()+"."+method.getName());
       
         // 通過反射調(diào)用目標對象的方法
        Object result = method.invoke(target, args);
       
        // 在方法調(diào)用后結束性能監(jiān)控
        PerformanceMonior.end();
        

        return result;
    }

    public Object getProxy(){
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), target.getClass().getInterfaces(), this);
    }
}

public static void main(String[] args) {
    UserService service = new UserServiceImpl();
    MyInvocationHandler handler = new MyInvocationHandler(service);
    UserService proxy = (UserService) handler.getProxy();
    proxy.add();
}

public class UserServiceImpl implements UserService {
    @Override
    public void add() {
        // TODO Auto-generated method stub
        System.out.println("--------------------add----------------------");
    }
}

public class CglibProxy implements MethodInterceptor {
    private Enhancer enhancer = new Enhancer();

    public Object getProxy(Class clazz) {
        // 設置需要創(chuàng)建子類的類
        enhancer.setSuperclass(clazz);
        enhancer.setCallback(this);
        // 通過字節(jié)碼技術動態(tài)創(chuàng)建子類實例
        return enhancer.create();
    }

    // 實現(xiàn)MethodInterceptor接口方法
    public Object intercept(Object obj, Method method, Object[] args,
            MethodProxy proxy) throws Throwable {
        System.out.println("前置代理");
        // 通過代理類調(diào)用父類中的方法
        Object result = proxy.invokeSuper(obj, args);
        System.out.println("后置代理");
        return result;
    }
}

public class DoCGLib {
    public static void main(String[] args) {
        CglibProxy proxy = new CglibProxy();
        // 通過生成子類的方式創(chuàng)建代理類
        UserServiceImpl proxyImp = (UserServiceImpl)proxy.getProxy(UserServiceImpl.class);
        proxyImp.add();
    }
}