[Design Mode] - structural -1- proxy mode

main character

1. Business methods implemented through an interface or abstract class declaration and true themes proxy object: abstract topics (Subject) category
2. Real theme (Real Subject) category: abstract achieve specific business topics, real object is represented by a proxy object, the object is to be the ultimate reference
3. Proxy (Proxy) class: provides the same interface with the real theme, the interior contains a reference to the real subject, it can access, control, or extend the functionality of the real theme

Code Display

package proxy;
public class ProxyTest
{
    public static void main(String[] args)
    {
        Proxy proxy=new Proxy();
        proxy.Request();
    }
}
//抽象主题
interface Subject
{
    void Request();
}
//真实主题
class RealSubject implements Subject
{
    public void Request()
    {
        System.out.println("访问真实主题方法...");
    }
}
//代理
class Proxy implements Subject
{
    private RealSubject realSubject;
    public void Request()
    {
        if (realSubject==null)
        {
            realSubject=new RealSubject();
        }
        preRequest();
        realSubject.Request();
        postRequest();
    }
    public void preRequest()
    {
        System.out.println("访问真实主题之前的预处理。");
    }
    public void postRequest()
    {
        System.out.println("访问真实主题之后的后续处理。");
    }
}

Spread

Dynamic proxies SpringAOP