java静态代理，动态代理（JDK,CGLib）

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静态代理

Hello接口

public interface Hello {    void say(String name);}

Hello实现类

public class HelloImpl implements  Hello {    public void say(String name) {        System.out.println("Hello "+name);    }}

Hello代理类

public class HelloProxy implements  Hello {    private Hello hello;    public HelloProxy(){        hello = new HelloImpl();    }    public void say(String name) {        before();        hello.say(name);        after();    }    private void before(){        System.out.println("before");    }    private void after(){        System.out.println("after");    }}

测试类

public class Main {    public static void main(String[] args) {        Hello helloProxy = new HelloProxy();        helloProxy.say("world");    }}

JDK动态代理

DynamicProxy 类

public class DynamicProxy implements InvocationHandler {    private Object target;    public DynamicProxy(Object target){        this.target = target;    }    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {        System.out.println("before");        Object result = method.invoke(target,args);        System.out.println("after");        return result;    }}

测试类

public class main {    public static void main(String[] args) {        Hello hello = new HelloImpl();        DynamicProxy dynamicProxy = new DynamicProxy(hello);        Hello helloProxy = (Hello)Proxy.newProxyInstance(                hello.getClass().getClassLoader(),                hello.getClass().getInterfaces(),                dynamicProxy        );        helloProxy.say("world");    }}

CGLib

CGLibProxy类

public class CGLibProxy implements MethodInterceptor{    private static CGLibProxy instance = new CGLibProxy();    private CGLibProxy(){    }    public static CGLibProxy getInstance(){        return instance;    }    public <T> T getProxy(Class<T> cls){        return (T) Enhancer.create(cls,this);    }    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {        System.out.println("before");        Object result = methodProxy.invokeSuper(o,objects);        System.out.println("after");        return result;    }}

测试类

public class Main {    public static void main(String[] args) {        Hello helloProxy = CGLibProxy.getInstance().getProxy(HelloImpl.class);        helloProxy.say("world");    }}

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