java的动态代理

JDK的动态代理

public interface Subject {
    Object request();
    void hello();
}

public class RealSubject implements Subject{
    public RealSubject(){};
    public Object request() {
        System.out.println("realsubject");
        return 1;
    }
    public void hello() {
        System.out.println("hello");
    }
}

public class ProxySubject implements InvocationHandler {
    private Object obj;
    public ProxySubject(Object obj) {
        this.obj = obj;
    }
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        System.out.println("增强前");
        //Object m = method.invoke(obj, args);
         method.invoke(obj, args);
        System.out.println("增强后");
        //return m;
         return null;
    }
}

public class Test {
    public static void main(String[] args) {
        ProxySubject proxy = new ProxySubject(new RealSubject());
        Subject sub = (Subject) Proxy.newProxyInstance(
                RealSubject.class.getClassLoader(),
                RealSubject.class.getInterfaces(), proxy);
        sub.request();
        sub.hello();
    }
}

cglib的动态代理

public class HelloWorld {
    public void sayHelloWorld() {
        System.out.println("HelloWorld!");
    }
    public int  say() {
        System.out.println(11111111);
        return 1;
    }
}


public class CglibProxy implements MethodInterceptor {
    private Object obj;
    public Object createProxy(Object target) {
        this.obj = target;
        Enhancer enhancer = new Enhancer();
        enhancer.setSuperclass(this.obj.getClass());
        enhancer.setCallback(this);
        enhancer.setClassLoader(target.getClass().getClassLoader());
        return enhancer.create();
    }
    public Object intercept(Object proxy, Method method, Object[] params,
            MethodProxy methodProxy) throws Throwable {
        System.out.println("增强前");
        Object result = methodProxy.invokeSuper(proxy, params);
        System.out.println("增强后");
        return null;
    }
}


public class Test {
    public static void main(String[] args) {
        HelloWorld hello = new HelloWorld();
        CglibProxy cglibProxy = new CglibProxy();
        HelloWorld hw=(HelloWorld) cglibProxy.createProxy(hello);
        hw.sayHelloWorld();
        hw.say();
    }
}