spring中的代理-蒲公英云

spring中的代理

1.静态代理：

public class Main2 {
    //这里传入的是接口类型的对象，方便向上转型，实现多态
    public static void consumer(ProxyInterface pi){
        pi.say();
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        consumer(new ProxyObject());
    }
}
//代理接口
interface ProxyInterface{
    public void say();
}
//被代理者
class RealObject implements ProxyInterface{
    //实现接口方法
    @Override
    public void say() {
        // TODO Auto-generated method stub
        System.out.println("say");
    }
}
//代理者
class ProxyObject implements ProxyInterface{
    @Override
    public void say() {
        // TODO Auto-generated method stub
        //dosomething for example
        System.out.println("hello proxy");
        new RealObject().say();
        System.out.println("this is method end");
    }
}
hello proxy
say
this is method end

控制台输出：

hello proxy
say
this is method end

2.动态代理：

package docker.demo;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
 * @program:dockerdemo
 * @desc:
 * @author:qiyihang
 * @date:2020/12/15
 */
public class DynamicProxy {
    static void customer(ProxyInterface pi){
        pi.say();
    }
    public static void main(String[] args){
        RealObject real = new RealObject();
        ProxyInterface proxy = (ProxyInterface) Proxy.newProxyInstance(ProxyInterface.class.getClassLoader(),new Class[]{ProxyInterface.class}, new ProxyObject(real));
        customer(proxy);
    }
}
interface ProxyInterface{
    void say();
}
//被代理类
class RealObject implements ProxyInterface{
    public void say(){
        System.out.println("i'm talking");
    }
}
//代理类，实现InvocationHandler 接口
class ProxyObject implements InvocationHandler {
    private Object proxied = null;
    public ProxyObject(){
    }
    public ProxyObject(Object proxied){
        this.proxied  = proxied;
    }
    public Object invoke(Object arg0, Method arg1, Object[] arg2) throws Throwable {
        System.out.println("hello");
        return arg1.invoke(proxied, arg2);
    };
}

控制台输出：

hello
i’m talking

代理类实现了InvocationHandler接口，

ProxyInterface proxy = (ProxyInterface) Proxy.newProxyInstance(ProxyInterface.class.getClassLoader(),new Class[]{ProxyInterface.class}, new ProxyObject(real));