通过案例理解Spring中静态代理

//租房
public interface Rent {
    public  void rent();
}

//房东
public class Host implements Rent{
    public void rent() {
        System.out.println("我的房子是蓝色的，准备出租房子！");
    }
}

public class Proxy implements Rent{
    private Host host;
    public Proxy(){ }
    public Proxy(Host host){
        this.host=host;
    }
    public void rent() {
        seeHouse();
        host.rent();
        fare();
    }
    //看房
    public void seeHouse(){
        System.out.println("中介带你看房子");
    }
    }
    //收费
    public void fare(){
        System.out.println("收中介费");
    }
}

public class Client {
    public static void main(String[] args) {
        Host host=new Host(); //房东要出租房子
        //代理，中介帮房东租房子，但是代理角色一般会有一些附属操作
        Proxy proxy=new Proxy(host);
        //客户不用面对房东，直接找中介租房即可
        proxy.rent();
    }
}

public class DynamicProxy {
    public static Object getProxyInstance(Object target){
        return Proxy.newProxyInstance(
            target.getClass().getClassLoader(),
            target.getClass().getInterfaces(),
            (proxy, method, args)->{
                Object result = method.invoke(target,args);
                return result;
            }
        );
    }
}

public class Client {
    public static void main(String[] args) {
        Rent proxyInstance1 = (Rent) DynamicProxy.getProxyInstance(
                new Host1());
        proxyInstance1.rent();
        Rent proxyInstance2 = (Rent)DynamicProxy.getProxyInstance(
                new Host2());
        proxyInstance2.rent();
    }
}