An in-depth explanation of java design patterns - static proxy

1. Define general interface

/**
 * 定义通用接口
 * @author Administrator
 * @date 2018/7/22
 */
public interface IBusiness {

    /**
     * 接口执行方法
     */
    void execute();
}

2. Define real operation implementation class

/**
 * 真实操作实现类
 * @author Administrator
 * @date 2018/7/22
 */
public class BusinessImpl implements IBusiness{

    @Override
    public void execute() {
        System.out.println("真正执行操作......");
    }
    
}

3. Static proxy operation

/**
 * 静态代理
 * @author Administrator
 * @date 2018/7/22
 */
public class ProxyBusiness implements IBusiness{

    /**
     * 定义需要执行的接口
     */
    private IBusiness business;

    /**
     * 通过set方法传参，真实需要执行的对象
     */
    public void setBusiness(IBusiness business) {
        this.business = business;
    }

    /**
     * 代理对象执行操作
     */
    @Override
    public void execute() {
        if(business == null){
            System.out.println("实际操作对象为null");
            return;
        }
        before();
        business.execute();
        after();
    }

    /**
     * 执行操作前
     */
    public void before(){
        System.out.println("执行操作前......");
    }

    /**
     * 执行操作后
     */
    public void after(){
        System.out.println("执行操作后......");
    }

    /**
     * 测试
     */
    public static void main(String[] args) {
        ProxyBusiness proxyBusiness = new ProxyBusiness();
        BusinessImpl business = new BusinessImpl();
        proxyBusiness.setBusiness(business);
        proxyBusiness.execute();
    }
}

Summary: Static proxy can pass Different implementation classes that implement common interfaces are used to complete related agents, but if they are not the same general interface, it is invalid; many interfaces and agent classes need to be implemented, resulting in large agent interfaces and implementation classes that are inconvenient to maintain. It is recommended to use dynamic proxy.

The above is the detailed content of An in-depth explanation of java design patterns - static proxy. For more information, please follow other related articles on the PHP Chinese website!