Java之jdk和CGLib实现动态代理

public interface Hello {
    public void sayHello();
}

public class HelloImpl implements Hello {
    @Override
    public void sayHello() {
        System.out.println("hello word");
    }
}

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
public class HelloInvocationHandler implements InvocationHandler{
    private Object object;
    PeopleInvocationHandler(Object object){
        this.object = object;
    }
    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        System.out.println("-------- start ---------");
        Object invoke = method.invoke(people, args);
        System.out.println("-------- end ---------");
        return invoke;
    }
}

import java.lang.reflect.Proxy;
public class Test {
    public static void main(String[] args) {
        HelloImpl hello = new HelloImpl();
        HelloInvocationHandler invocationHandler = new HelloInvocationHandler(hello);
        Hello proxy = (Hello) Proxy.newProxyInstance(HelloImpl.getClass().getClassLoader(), HelloImpl.getClass().getInterfaces(), invocationHandler);
        proxy.sayHello();
    }
}

public class Hello {
    public Hello() {
        System.out.println("Hello...");
    }
    public void print() {
        System.out.println("hello word");
    }
}

public class CglibProxyIntercepter implements MethodInterceptor {
    @Override
    public Object intercept(Object sub, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
        //对目标方法进行拦截处理 
        System.out.println("before...");
        Object object = methodProxy.invokeSuper(sub, objects);
        System.out.println("after...");
        return object;
    }
}

public class CglibProxyIntercepter implements MethodInterceptor {
    @Override
    public Object intercept(Object sub, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
        //对目标方法进行拦截处理 
        System.out.println("before...");
        Object object = methodProxy.invokeSuper(sub, objects);
        System.out.println("after...");
        return object;
    }
}

public class Test {
    public static void main(String[] args) {
        //创建加强器，用来创建动态代理类
        Enhancer enhancer = new Enhancer();
        //为加强器指定要代理的业务类
        enhancer.setSuperclass(Hello.class);
        //设置回调
        enhancer.setCallback(new CglibProxyIntercepter());
        //创建代理对象
        Hello proxy= (Hello) enhancer.create();
        proxy.print();
    } 
}

before...
hello word
after...